103578 Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension COHTA 11 Issue 2 | 4 January 2013 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd Postnet Suite No.93 Private Bag X1 Melrose Arch Johannesburg 2076 South Africa www.arup.com www.arup.com Document Verification Job title 1031794 -Technical Assistance for Water and Job number Wastewater Treatment Works 219191 Document title Evaluation of project extension File reference Document ref COHTA 11 Revision Date Filename Report.docx Issue for 13 Oct Description Final report rev 1.docx comment 2012 Prepared by Checked by Approved by Name A M Robertshaw J Broome AM Robertshaw Signature Issue 19 Nov Filename 2012 Description For issue after time for comment closed Prepared by Checked by Approved by Name A M Robertshaw J Broome A Robertshaw Signature Issue 2 4 Jan Filename Final report for issue 2 .docx 2013 Description Addition of Geotech Investigation Report and emphasis on use of SAZ Specifications Prepared by Checked by Approved by Name Andy Robertshaw Jeff Broome Andy Robertshaw Signature Filename Description Prepared by Checked by Approved by Name Signature Issue Document Verification with Document  COHTA 11 | Issue 2 | 4 January 2013 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension Contents Page 1 Introduction 1 1.1 Terms of Reference 1 1.2 Background 1 1.3 Objective 1 2 Work Plan and Deliverables 1 2.1 Staff Resources 1 2.2 Outputs 1 3 Required Tasks 3 3.1 General Tasks 3 3.2 Final Design Brief 5 3.3 Agree procurement strategy 5 3.4 Standard General Conditions of Contract and General Specifications 6 4 Design Scope of Works for Water Treatment Works Infrastructure 7 4.1 Task One : Prince Edward Works 7 4.2 Task Two : Morton Jaffray Works 8 5 Design Scope of Works for Waste Water Treatment Works Infrastructure 9 5.1 Task Three, Little Marimba Outfall Sewer 10 5.2 Task Four (a) : Firle Existing Effluent Pump Station (EEPS) and rising mains 10 5.3 Task Four (b): Replace raw sewage pumps in the Mufakose pumpstation at Crowborough WwTW. 11 5.4 Task Five : Budiriro pumping station 11 5.5 Task Six : Optimisation of Sewage Treatment Plants 13 5.6 Task Seven 13 6 Design Brief Standard Format 13 6.1 Background 13 6.2 Project Rationale and Objectives 14 6.3 Project Objectives 14 6.4 Proposed Solution 14 6.5 Scope of Investigations, Survey and Design 14 7 Scope of Work and Design Brief 19 7.1 Water treatment design brief 19 COHTA 11 | Issue 2 | 4 January 2013 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension 7.2 Waste Water treatment design brief 19 8 Assessment of assignment 19 8.1 Roll-out of Urgent Works 19 8.2 Recommended next steps 20 8.3 Current implementation 20 9 Conclusion 20 Appendices Appendix A Design Brief PE001 Overall Design Appendix B Design Brief MJ001 Clarifier Three Appendix C Design Brief MJ002 Flow Control Appendix D Design Brief MJ 003 Paterson Filter Refurbishment Appendix E Design Brief MJ004 Medium Pump Sump Design Appendix F Design Brief MJ005 Medium Pumps Appendix G Design Brief MJ006 Clarifier Eight Inclined Plate Settler Appendix H Design Brief MJ007 Plant Two Filter Galley Appendix I Design Brief MJ008 Overall Design Appendix J Design Brief 1 Firle Effluent Appendix K Design Brief 2 Little Marimba Appendix L COHTA 11 | Issue 2 | 4 January 2013 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension Design Brief 3 Mafakose Pumpstation Appendix M Design Brief 4 Budiriro Appendix N Design Brief 5 Optimisation Appendix O Scope of Work for the appointment of a Geotechnical Specialist COHTA 11 | Issue 2 | 4 January 2013 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension 1 Introduction 1.1 Terms of Reference This Final Report is submitted in accordance with the extended Terms of Reference. This forms the final deliverable of the extended consultancy contract between the World Bank and Arup (Pty) Ltd. 1.2 Background The Government of Zimbabwe has previously requested the World Bank for Technical Assistance (TA) support to assist the City of Harare to assess both the operational capacity and the adequacy of existing operations so as to improve operational efficiency and to carry out extensive training of plant operations with the staff. The TA team has completed the assignment, but following the submission of the Evaluation Report, the TA consultant was asked undertake additional work that is a natural extension of the appointment, but was not included in the original scope. 1.3 Objective The objective of the extension to the scope of works was to assist the City of Harare to develop design briefs that would be required for the appointment of professional service providers to undertake the design and tender process. They included:   Scoping of the required urgent works and preparation of the design brief for the procurement of professional services necessary for the design, tendering and supervision of the work;  Provision of a schedule of the required surveys, tests and other investigations and related reports. 2 Work Plan and Deliverables 2.1 Staff Resources The Consultant continued to provide two experienced, and suitably qualified, consultants, one with water treatment experience and the other in wastewater operations. The specialists, namely Eng Robertshaw and Eng Broome, were to address the water treatment infrastructure projects and the wastewater treatment projects respectively. Both Eng Broome and Eng Robertshaw were mobilised on the 2 July 2012. 2.2 Outputs The project outputs were provided in accordance with the dates in the following table: COHTA 11 | Issue 2 | 4 January 2013 Page 1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension Description Date Draft Inception report 12/07/2012 Draft Scope of Works and Design Brief 03/08/2012 Final Report 31/10/2012 Inception Report The Inception Report underwent several iterations, to allow the client to include for changes resulting from the implementation of the Urgent Water Supply and Sanitation Rehabilitation Project (UWSSRP Project Phase One). Final Report The Final Report (this document) includes an evaluation of the assignment, together with the scope of works and design brief for each of the required design scope definitions. COHTA 11 | Issue 2 | 4 January 2013 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension 3 Required Tasks 3.1 General Tasks 3.1.1 Confirmation of Scope of Work The requested extension to the TA assignment lists projects selected from the urgent works identified during the previous phase of the project. A total of 30 works packages were identified. The items that form the basis of this extension include both entire work packages and some partial works packages. For complete clarity, it was important that the exact scope of the projects was agreed before work proceeded. This is particularly important for the wastewater packages as the description is extremely brief. For instance, in the package of works identified for Budiriro Pumpstation includes pumps, rising mains, and storage or treatment ponds. 3.1.1.1 The Inception Meeting A draft Inception Report was prepared and issued for comment and following this, the project Inception was held (18 July 2012). The purpose of the meeting was to allow: • The Arup TA to present their Inception report, and specifically, to detail the assignment tasks; • Lahmeyer GKW, the technical specialists, appointed to manage the Urgent Water Supply and Sanitation Rehabilitation Project (UWSSRP Project Phase 1), to report their progress with UWSSRP Project. • Identification of areas of possible duplication in the work of the two consultants (viz. Arup and Lahmeyer); • Discussion and agreement how to avoid the duplication; • Finalise the details of the TA Extension tasks. 3.1.1.2 First Revision of Tasks Identified Following agreement at the Inception Meeting, Lahmeyer GKW, provided Arup with a list of projects to be undertaken as part of the Urgent Water Supply and Sanitation Rehabilitation Project (UWSSRP Project Phase 1). These projects included a number of the urgent works packages identified through the Arup TA, and thus there was a need to avoid duplication. The notes of the issued Inception Meeting held on 18 July 2012 clearly indicate the revised tasks. 3.1.1.3 Second Revision of Tasks Identified Some further revision, to accommodate the upgrades to Harare Water’s waste water system, was identified during the technical review meeting held on 1 August 2012. Harare Water indicated their current need was for funding for the most urgent problems including the Little Marimba Outfall Sewer and Budiriro COHTA 11 | Issue 2 | 4 January 2013 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension Pumpstation. What was really wanted were tender documents for these projects and not just Project Briefs for procuring consultants’ services, which as regards both time and cost was beyond the scope of the TA Extension. The Waste Water specific projects, being the Little Marimba Outfall Sewer (LMOS); the Firle Final Effluent Pumpstation and rising mains; the Budiriro Pumpstation; and the Final Effluent Ponds; and the need to coordinate these, with the projected implemented under UWSSRP Phase One, were reviewed at the Interim Progress meeting held on 3 August 2012. Arup TA noted that this meeting was held to clarify the tasks to be undertaken during the extension to the TA assignment, particularly as the UWSSRP project list, provided to Arup by Lahmeyer, included part of the tasks originally try to adjust them to dovetail with the work being undertaken under the and to revise the draft inception report to suit 3.1.1.4 Little Marimba Outfall Sewer The Project Brief will highlight particular concerns or matters that must be taken into consideration when tendering the works. In the case of the LMOS, this would include investigating the feasibility of in-situ repair, repair of structures and manholes and a hydraulic check of the capacity of the sewer. 3.1.1.5 Firle Final Effluent Pumping and Rising Mains It was noted at the inception meeting that this task needed to include design checks on pumps procured via the UWSSRP and it was agreed this was the approach to be adopted with the TA Extension, as detailed in the Inception Report. 3.1.1.6 Budiriro Pumpstation The Arup TA had been in contact with the engineers undertaking the housing development proposed by CABS and the housing co-operative. A review of the CABS engineer’s proposal concluded that there was a danger of producing an unsustainable system that would, in any case, not provide any benefit during power cuts. It was agreed that a more strategic approach was needed including master planning for the catchment including: • Consideration of installing ponds or other treatment in the catchment • Consideration of pumping partially treated effluent instead of raw sewage • Survey of the existing sewerage infrastructure to identify necessary repairs A previous study by Lamont would form a basis for the studies required. 3.1.1.7 Final Effluent Ponds The scope for the UWSSRP included for desludging and repairs to the final effluent ponds at both Crowborough, where there is a danger of the pond embankments failing, and at Firle. COHTA 11 | Issue 2 | 4 January 2013 Page 4 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension 3.2 Final Design Brief The Arup TA presented a draft of the structure of the final design brief document for discussion and agreement. The structure of the proposed project briefs will include the following sections: • Background • Project Rationale and Objectives - A description of the need for the project and the specific objectives to be achieved • Proposed Solution - A description of the approach identified for the project • Scope of Work - A description of the work to be carried out • Scope of Investigations Survey and Design - Details of the investigations and surveys that would be required to carry out the design and supervision of the works. In addition to the scope of works and project briefs, it was agreed that the following outputs would be included: • Contract data completed for a standard contract including special conditions required to comply with City of Harare Standing orders and the Urban Councils Act; and • A brief project proposal or funding application to accompany all of the projects briefs. Chapter Six provides a more detail of the structure of the design brief standard format. 3.3 Agree procurement strategy There are a number of different options available for executing the proposed works. This may be done by engaging a consultant to undertake all the investigations, surveys and design work prior to going to tender, with the contractor responsible only for carrying out the works, or alternatively the contractor may be made responsible for parts or all of the investigations and for the design. The proposed works differ in their suitability for one or other of these strategies and so the procurement strategy will have to be agreed on a project by project basis. Projects more suitable for contractor involvement in design (design and build) will tend to be those where the scope and characteristics of the work are well define, such as where existing equipment is to be replaced with new equipment without any significant changes in duty. Where investigations and surveys will be required to determine the capacity of the plant to be installed, or where the feasibility might be affected by ground conditions, it would be preferable to have the design completed before the issue of tenders. COHTA 11 | Issue 2 | 4 January 2013 Page 5 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension 3.4 Standard General Conditions of Contract and General Specifications It is important that any conditions of contract proposed be of such a nature that they could be used with both “design and build” or the more conventional construction contracts when preparing tenders for the proposed works. This would ensure that one tried and tested set of conditions are used for all the contracts. It is noted that the current South African General Conditions of Contract (GCCE (2010)) has been used for both contracting approaches. Further, the GCCE (2010) is a further development from the same common standard the Zimbabwe General Conditions of Contract (Blue Book) was developed from. Harare Water has proposed that, where possible, the FIDIC Small Works Contract be used. As the works may be funded from a variety of sources; it was proposed that the FIDIC Small Works Contract be the default contract, with the proviso that an alternative contract for a specific application be utilised where necessary due to the requirements of the funding agency or where the type of project or procurement route makes another form of contract from the FIDIC suite more appropriate. It is also recommended that the specifications for the various contracts be made as consistent as possible by adopting a general specification. The Standards Association of Zimbabwe (SAZ) standards, as applicable, shall apply and supplemented with both British Standards and South African National Standards; such as the South African National Standards (SANS 1200) for civil engineering projects; be used for all contracts. COHTA 11 | Issue 2 | 4 January 2013 Page 6 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension 4 Design Scope of Works for Water Treatment Works Infrastructure The main water treatment works tasks to be completed are for upgrades or refurbishment at the Prince Edward Works and at the Morton Jaffray Works. 4.1 Task One : Prince Edward Works Task One of the water implementation was the design scope necessary to allow for the replacement of the Prince Edward Works raw water, dewatering and potable water pumps, together with associated valves, controls and power requirements, and for the chemical dosing for lime, silica, and gaseous chlorine. This task required the definition of the scope of work, and a design brief for the following sub-tasks: 1. The mechanical and electrical design of the raw water pumps, for the three high lift pumps and for dewatering pumps in both the low lift and high lift pump houses; 2. The design of valves, fittings and appurtenances to enable installation of pumps; 3. Supply, testing, installation, commissioning and post commissioning training, including manuals for:  Lime dosing;  Silica pumps;  Gas chlorination system. However, Lahmeyer indicated that they have allowed for the replacement on a “like with like” basis for two low lift pumps and two high lift pumps and thus the need for this design brief falls away. It was noted that the original equipment supplier has informed Lahmeyer that the pumps as specified are of an outdated standard and would need to be specially made with a possible 40 week delivery time. Thus, it is certain that the pumps proposed by the pre-qualified tenderers will be incorrectly suited for the current duty, nor for the Harare Water requirement to optimise power usage. The TA consultant’s had previously stressed that regardless of whether the financing approach of the Prince Edward urgent works was as a single package or as smaller individual projects; the overall Works Upgrade works should, for a number of good engineering reasons, be designed as a single project. Thereafter, depending on funding or budgetary constraints, the individual work packages described above can be formulated as separate projects. This approach will prevent the numerous interface problems that occur when a large project is broken into multiple smaller projects. The Arup TA notes that this approach was not followed. The UWSSRP Phase 1 funds were provided for “Chemical Storage, Preparation and Dosing” that covers the chemical dosing sub-task, this task will be removed from Arup TA scope of works, on the assumption the tender calls for the supply, COHTA 11 | Issue 2 | 4 January 2013 Page 7 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension testing, installation, commissioning and post commissioning training, including manuals for:  Lime dosing;  Silica pumps;  Gas chlorination system Task One will therefore be amended to provide for a design check of the entire works, considering the proposed new demands, the potential to supply greater Harare, and will include an assessment of the pumps proposed by the successful UWSSRP Project Phase 1 (Prince Edward WTW contract) that will include:  The mechanical and electrical design for the tendered low lift pumps and the high lift pumps,  The design of valves, fittings and appurtenances to enable installation of these pumps;  The life cycle cost. 4.2 Task Two : Morton Jaffray Works Task Two of the water implementation, consisted originally of 6 sub-tasks, which included the replacement of the Morton Jaffray Works bulk metering and lime dosing equipment, refurbishment of the Accentrifloc Clarifier Three, refurbishment of the entire Plant One Paterson filter building and equipment, replacement of the medium pumps together with a new pump sump, and the Clarifier Eight upgrade and increased filtration capacity. 4.2.1 Scope of work, and a design brief The task required the definition of the scope of work, and a design brief for the following sub-tasks:  Design, install and commission new bulk water meters to allow for measurement of both raw water inflow and for potable discharge from the Morton Jaffray Works;  Supply, testing, installation, commissioning and post commissioning training, including manuals for lime dosing;  Design, fabricate, install and test the mechanical and electrical components of the Accentrifloc Clarifier (Clarifier Three);  Design, fabricate, construct, install, and test the filtration system, equipment, controls and power supply, needed to completely refurbish the existing Plant One Patterson filtration system;  Design, construct and commission a new pump sump for the Medium Pumps;  The mechanical, controls and electrical design of the medium potable water high lift pumps, procure and test the pumps, fabricate the design of valves, fittings and appurtenances to enable installation of pumps, test and commission the pumps;  Supply and install inclined plate settler, to increase clarification by at least 50%, for Clarifier Eight; COHTA 11 | Issue 2 | 4 January 2013 Page 8 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension  Design, construction, test and commission an additional filter gallery to match the above increase in clarifier production. An additional sub-task was requested for the TA to draft an appointment for the geotechnical investigation needed to determine the cause of the subsidence in the north west corner of plant three clarifiers, and to propose solutions. Due to duplication with the UWSSRP Project Phase 1 (Morton Jaffray WTW contract) the following sub-tasks were removed from Arup scope:  Bulk metering;  Lime dosing equipment;  Replacement of the medium pumps. Additional tasks were added, being:  The Scope of Work for the appointment of a specialist to undertake a geotechnical investigation into subsidence of plant three clarifiers and to propose mitigation;  The Scope of Work for the replacement of inlet control valves from Lake Chivero and Lake Manyame. Thus, the scope of work for Task Two was:  Design, fabricate, install and test the mechanical and electrical components of the Accentrifloc Clarifier (Clarifier Three);  Design, fabricate, construct, install, and test the filtration system, equipment, controls and power supply, needed to completely refurbish the existing Plant One Patterson filtration system;  Design, construct and commission a new pump sump for the Medium pumps;  Supply and install inclined plate settler, to increase clarification by at least 50%, for Clarifier Eight;  Design, construction, test and commission an additional filter gallery to match the above increase in Clarifier Eight’s production;  The scope of work for the appointment of a specialist to undertake a geotechnical investigation into subsidence of plant three clarifiers and to propose mitigation;  The scope of work for the replacement of inlet control valves from Lake Chivero and Lake Manyame. 5 Design Scope of Works for Waste Water Treatment Works Infrastructure The waste water treatment works tasks are for upgrades or refurbishment at Firle and Crowborough wastewater treatment works, Budiriro sewage pumpstation, an outfall sewer and optimisation of the operation of biological Nutrient Removal (BNR) activated sludge plants. The waste water package will include address the following:  COHTA 11 | Issue 2 | 4 January 2013 Page 9 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension 5.1 Task Three, Little Marimba Outfall Sewer The Little Marimba Outfall Sewer was identified as posing significant risks due to numerous collapses and leaks and so was identified as being in need of rehabilitation. Some resources have been made available under the UWSSRP to carry out repairs, but a more strategic view is required for planning and implementing a longer term solution to the sewerage problems of this catchment because there has been a great deal of settlement within the catchment and sewage flows are likely to exceed the capacity of the system. The tasks required include:  Carry out a survey to determine the current and probably future number of connections in the Little Marimba catchment;  Prepare estimates for credible scenarios of existing and future sewage generation in the catchment and flow regimes;  Carry out a detailed survey of the existing sewerage system to define the capacities;  Carry out detailed survey of the condition of the existing sewer and determine the feasibility of in-situ repair and the works required to manholes and chambers;  Determine the most appropriate combination of repair, replacement, duplication or abandonment to provide the design capacity required and the most appropriate location for additional treatment capacity;  Design the rehabilitation and new works required and prepare a phased investment plan for implementation of the works;  For the initial phase:  Install new, or line, or repair existing sewer pipes as appropriate;  Repair structures and manholes as required;  Test and commission the new and rehabilitated pipelines. 5.2 Task Four (a) : Firle Existing Effluent Pump Station (EEPS) and rising mains Task Four includes pumps, rising mains and ponds and has been sub-divided into two sub-tasks for ease of definition. At present Harare Water are carrying out works to install new pumps in the effluent pump station at Firle WwTW, however, a number of serious problems remain. These problems include pumping capacity, corrosion and excessive leakage of the pump station discharge manifold, and leakage from the two rising mains lifting sewage to the farms where irrigation is carried out. Sub-task one was to draft a scope of works for an assessment of leaking pump station discharge manifold and the two rising mains to the farms where irrigation is carried out. Under the UWSSRP, additional pumps are due to be installed and repairs carried out to the pumpstation pipework and parts of the rising mains replaced. To prevent conflict and duplication of work, Task Four will be reduced to include of a design check of: COHTA 11 | Issue 2 | 4 January 2013 Page 10 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension • The pump type proposed; • Rising main system curves including a check on the compatibility with the tendered pumps; • An assessment of the feasibility of in-situ lining or repair of the rising mains. In addition the scope will include: • An assessment of the need for further repairs or replacement of pipework and equipment in the pumpstation. • Procurement, installation, testing and commissioning of replacement or refurbished equipment and pipework in the pumpstation. 5.3 Task Four (b): Replace raw sewage pumps in the Mufakose pumpstation at Crowborough WwTW. Original it was proposed that task 4(b) would consist of desludging and repairing the effluent ponds at the Crowborough WwTW. This has now been included in the UWSSRP and so this task is removed from the TA Extension and an alternative has been agreed. The trickling filters and humus tanks of Crowborough Units 1 and 2 are to be refurbished under the UWSSRP, but there will not be a means of disposing of sludge from the humus tanks. Formerly the humus sludge was mixed with the raw sewage from the Mufakose outfall sewer and pumped to the inlet works. While a temporary solution may be possible, it is agreed that until the outfall sewer and pumpstation are returned to service, the trickling filters cannot be used. The scope for the package would include:  Surveying the condition of the Mufakose Outfall Sewer, inlet works, raw sewage pumpstation and rising main;  Determine the feasibility of repair, relining or replacement of pipelines;  Design the necessary repair and rehabilitation works for the sewer, rising main and inlet works;  Select pump type and duty; and  Procure, install, test and commission pumps and associated electrical and control equipment;  Procure, construct, test and commission pipelines and civil works. 5.4 Task Five : Budiriro pumping station The UWSSRP Phase 1 does not cover any activities related to the Budiriro pumpstation or within its catchment, and so this project remains in the Arup TA scope of work. However, as discussed below the scope of the assignment has had to be modified. The complete Urgent Works package for Budiriro Pumpstation includes for provision of pumps, the relining or replacement of the rising main and the construction of a pond or ponds for storage or partial treatment of sewage that would otherwise escape untreated into the river during power cuts. What has not COHTA 11 | Issue 2 | 4 January 2013 Page 11 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension been catered for in this work package is that there is a significant area of new housing planned for the catchment. It has therefore been agreed that a strategic plan for the catchment should be prepared to determine the advisability of pumping all effluent from the catchment to the Firle treatment works, or whether some or all of the sewage should be treated or partially treated within the catchment. Considerable investigation works will be required to properly define this work package, which should include a comprehensive survey of the sewage reticulation of the entire catchment to identify its capacity and points where stormwater and grit can enter the system. Without this it is unrealistic to design and install inlet works and a pumping system that will not be overwhelmed many times per year. The scope for the strategic planning component of this package should include:  Carry out a survey to determine the current and probably future number of connections in Budiriro, including the proposed CABS and housing co- operative developments;  Prepare estimates for credible scenarios of existing and future sewage generation in the catchment and flow regimes:  Carry out detailed survey of the existing sewerage system and determine the capacities and identify areas where the predicted flows exceed the existing capacity;  Survey the existing sewer reticulation and identify repairs required to limit stormwater and grit ingress, assess the feasibility of in-situ repair and the works required to manholes and chambers;  Consult with stakeholders, particularly residents, COH Planning Department CABS, housing co-operatives and other developers;  Carry out a strategic plan for the Budiriro area, including but not limited to pumping to existing treatment works via the existing, partially complete, or new pumpstations, detention of sewage during periods of high flow or power outage, partial or full treatment at one or more locations within the catchment and disposal or transfer of effluent.  Prepare a phased implementation plan to allow for development of the planned new housing without delay. For the first phase of the programme the following works will probably be required, except where an alternative approach is proposed:  Select a suitable pumps and pipeline and main combinations considering potential for relining the existing rising main for existing and proposed pumpstation;  Carry out civil mechanical and electrical design of inlet works, pumpstation(s) and rising mains:  Carry out all required civil, mechanical and electrical design for all proposed treatment works, sewage detention ponds and sewers  Install test and commission all works required in Phase 1 of the strategic plan;  Carry out all required repairs or replacements to the existing sewer reticulation system. COHTA 11 | Issue 2 | 4 January 2013 Page 12 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension 5.5 Task Six : Optimisation of Sewage Treatment Plants It was agreed that this additional item be included in the scope to consider monitoring and optimising the operation of the rehabilitated BNR plants. This is proving to be particularly difficult due to the intermittent power supply. The project brief should also include provision for the characterisation of domestic and industrial effluents. The tasks required include:  Characterisation and monitoring of raw sewage and partially treated effluent throughout the plants;  Carry out a check on the process design for all BNR plants;  Optimise operation of each plant including mitigation of the effects of interruptions to power supply;  Recommend any design changes necessary to improve performance and reduce operating costs;  Produce an operations and maintenance manual specific for each design of BNR plant. 5.6 Task Seven Task Seven was to prepare, for each of the Scope of Works defined above, a Design Brief. These are for: the Prince Edward Works; the Morton Jaffray Works; the Little Marimba Outfall Sewer; Firle (Existing) Effluent Pumpstation (EEPS) and rising mains design check; Mufakose Outfall Sewer and Pumpstation; the Budiriro Pumpstation and strategic plan; and optimisation of the operations of the BNR plants. 6 Design Brief Standard Format This chapter expands on the agreed format for the Design Brief 6.1 Background Harare Water, a semi-autonomous entity within the City of Harare, has obtained funding to carry out repairs and improvements to (insert name of Water or Wastewater Treatment Works). This is to include the (insert equipment/ process or plant) which is in need of significant rehabilitation. Add clear description of works required This assignment is to check on the suitability of the (insert equipment/ process or plant) being procured and recommend any changes if necessary and design and procure permanent repairs or replacement of the (insert equipment/ process or plant. It is proposed to engage a firm of consulting engineers (‘the consultant’) to carry out the assignment to carry out the necessary investigations and surveys, prepare designs and tender documents for procuring the works and supervising the construction phase. COHTA 11 | Issue 2 | 4 January 2013 Page 13 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension 6.2 Project Rationale and Objectives The project rationale is to (insert the reason for the project) 6.3 Project Objectives The objectives are to:  Return the (insert equipment/ process or plant ) to full and safe operating condition able to meet the required duty and under full automatic control; or  Refurbish or rehabilitate the (insert equipment/ process or plant ) to (the standard required ) 6.4 Proposed Solution It is proposed that the (insert equipment/ process or plant) is to be repaired or replaced to give a design life of 60 years. In addition necessary repairs and improvements to the pumpstation fabric are to be carried out. The philosophy to be adopted is that the existing plant and equipment is to be reused to the maximum extent possible that is consistent with economic, safety and reliability considerations. Plant is to be specified on the basis of whole life cost, reliability, durability and the availability of local capacity for service and repair. The (insert equipment/ process or plant) is located at/ near to/ operates within/etc. (insert the risk issue) and so is vulnerable to (describe risk). A risk assessment to identify the risk and propose mitigation shall be undertaken as part of the development of a solution to the identified problem. 6.5 Scope of Investigations, Survey and Design 6.5.1 Project stages The services required in delivering the assignment are described in stages defined in accordance with the current South African Guideline Scope of Services and Tariff of Fees for Registered Persons. The stages are Stage 1– Inception Establish client requirements and preferences, assess user needs and options, appointment of necessary consultants, establish the project brief including project objectives, priorities constraints, assumptions, aspirations and strategies. Stage 2 – Concept and Viability (Preliminary Design) Prepare and finalise the project concept in accordance with the brief, including project scope, scale, character, form and function, plus preliminary programme and viability of the project. Stage 3– Design Development (Detailed Design) COHTA 11 | Issue 2 | 4 January 2013 Page 14 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension Develop the approved concept to finalise the design, outline specifications, cost plan, financial viability and programme for the project. Stage 4 – Documentation and Procurement Prepare procurement and construction documentation, confirm and implement the procurement strategies and procedures for effective and timeous procurement of necessary resources for execution of the project. Stage 5 – Contract Administration and Inspection Manage, administer and monitor the construction contracts and processes including preparation and coordination of procedures and documentation to facilitate practical completion of the Works. Stage 6 – Close Out Fulfil and complete the project close-out including necessary documentation to facilitate effective completion, handover and operation of the project. Alternatively, the ZACE conditions could be used. 6.5.2 Stage 1– Inception 6.5.2.1 Existing data The Consultant shall in the first instance obtain all the available existing documentation relating to the (insert equipment/ process or plant). 6.5.2.2 Investigations and surveys Investigations shall include at least the follow:  An assessment of the condition of (insert equipment/ process or plant)and their suitability for repair and reuse;  An investigation into the feasibility and suitability of in situ remediation of the (insert equipment/ process or plant)existing effluent rising mains; and  An assessment of the safety and adequacy of the electrical power supply. Where information necessary for design or future records are not available, the Consultant shall arrange for these surveys and investigations to be carried out. These may include:  Topographic surveys of (insert equipment/ process or plant; and  Surveys of the buildings, chambers and existing installations in which the (insert equipment/ process or plant) operates. 6.5.3 Stage 2 – Concept and Viability (Preliminary Design) Activities covered under Stage 2 would include, but not be limited to:  An assessment of the volumes the (insert equipment/ process or plan) the treats or processes and to what standard; COHTA 11 | Issue 2 | 4 January 2013 Page 15 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension  Determination of the duty design envelope for the (insert equipment or plant;)  Selection of the (insert equipment or plant) preferred duty arrangements (Number of pumps for duty, assist, standby etc.)  Selection of the (insert equipment or plant) preferred type, including suitability (throughlet, solids handling capability, pump materials, etc.);  Selection of the preferred repair or replacement option for the(insert equipment or plant.;  Outline of the preferred control philosophy and instrumentation required;  (Insert other requirements not covered above) 6.5.4 Stage 3– Design Development (Detailed Design) 6.5.4.1 Design In terms of (insert equipment or plant) that are to be procured under other contracts, the design development phase will be concerned with developing the criteria for checking the(insert equipment or plant) selection. If additional(insert equipment or plant) are to be procured under the project, the design criteria shall be used as the basis of any additional tender. The design works shall include at least the following:  Determination of the system characteristics, This would include determination of:  (insert equipment/ process or plant requirements  Transient analysis, particularly for the effects of loss of power.  Design of all components of(insert equipment or plant),  Design of all required repairs and improvements to the (insert equipment or plant) building, chambers and associated structures; and  Design of all required electrical and control works.  Detailed life cycle costing of options and determination of liquidated damages that will be applicable for under performance of(insert equipment or plant). 6.5.5 Stage 4 – Documentation and Procurement 6.5.5.1 General Some elements of the project could be tendered on a design and build basis. If this is the case, the elements to be designed by the contactor must be clearly identified in the Tender Documents. The total extent of investigations, surveys and design work required will not be reduced, thus all items identified in this Brief must be included either in either the Consultant’s or the Tenderer’s scope. COHTA 11 | Issue 2 | 4 January 2013 Page 16 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension 6.5.5.2 Contents of Tender Documents Form of Contract The form of contract is likely to be determined to a large extent by the funding agency’s requirements and the amount of design for which the Contractor will be responsible, rather than any preference of Harare Water. The requirements for the Appendix to the Form of Contract and the Special Conditions of Contract are dealt with in general terms of the FIDIC Short Form of Contract in the General Project Brief. Specification The Specification will be based on the relevant sections of the Standard Specification the SAZS, supplemented by the SANS 1200. Any additions and modifications to the requirements of the 120 series shall be incorporated in the particular Specification and shall be framed in accordance with the requirements of SANS 1200. Additional standards will be in SAZ standards, where available, or British or other internationally recognised standards. The Particular Specification shall define at least the following:  Location and limits of the site;  Security requirements and procedures;  Access to site;  Handover of the site including responsibilities for isolation of services and any diversions required;  Facilities to be provided by the Employer;  Facilities to be provided by the Contractor, including accommodation and facilities for staff and the Employer;  Applicable legislation’ including employees’ protection and environmental protection;  Health and safety requirements;  Contractor’s liabilities, including for pollution incidents;  Contractor’s design responsibilities and liabilities;  Conditions and procedures for takeover by the Employer. Contractor’s documentation The specification shall define the documentation to be provided by the Contractor. In particular it should specify the format and content of the required documents that should include: Requirements for the tender programme specifying format, milestones etc.; Risk assessments and method statements for particular activities; A detailed commissioning plan; Scale and accuracy for ‘as built’ and design drawings; COHTA 11 | Issue 2 | 4 January 2013 Page 17 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension Items of work for which calculations are required; Construction completion report; Operations and maintenance manuals; and Inputs to a health and safety file for the project including details of suppliers and particular risks associated with the operation, maintenance and decommissioning of the works. 6.5.6 Stage 5 – Contract Administration and Inspection The Consultant shall provide suitably qualified and experienced staff to supervise construction. 6.5.7 Acceptance testing Requirements for acceptance testing for pumps and other equipment shall be specified including:  Requirements for witnessing of tests  Grade of acceptance testing required for pumps  Responsibility for costs of testing and witnessing. 6.5.8 Other testing and commissioning Particular attention should be paid to defining the type, frequency and required standards for testing. The requirements for Commissioning shall be specified in details including responsibility for supply of equipment, responsibility for costs of consumables for initial testing and re-testing where necessary. 6.5.9 Stage 6 – Close Out Consultant’s documentation The Consultant shall deliver the following documentation in addition to the tender documentation issued.  All background information collected and results of surveys and investigations conducted;  A health and safety file including the basis of design, particular risks associated with the operation, maintenance and decommissioning of the works and contact details for all parties involved. COHTA 11 | Issue 2 | 4 January 2013 Page 18 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension 7 Scope of Work and Design Brief Each Scope of Work and the associated Design Brief’s are listed below and attached in the Appendices. 7.1 Water treatment design brief  Design Brief PE001 Overall Design;  Design Brief MJ001 Clarifier Three;  Design Brief MJ002 Flow Control;  Design Brief MJ003 Paterson Filter Refurbishment;  Design Brief MJ004 Medium Pump Sump Design;  Design Brief MJ005 Medium Pumps;  Design Brief MJ006 Clarifier Eight Inclined Plate Settler;  Design Brief MJ007 Plant Two Filter Galley;  Design Brief MJ008 Overall Design; 7.2 Waste Water treatment design brief  Design Brief 1 Firle Effluent;  Design Brief 2 Little Marimba;  Design Brief 3 Mafakose Pumpstation;  Design Brief 4 Budiriro;  Design Brief 5 Optimisation; 8 Assessment of assignment The Terms of Reference for this assignment require that among of activities, the TA Consultant undertake an assessment of the assignment, which follows. The Urgent Works and Equipment Report, referenced as COHTA02, and prepared under the initial assignment, refers. 8.1 Roll-out of Urgent Works The urgent works, identified and described in the COHTA02 Report, were grouped into packages that form convenient sized contracts. The package selection was done to maximise the improvements in performance of the works, either as increased water output or wastewater treatment improvements. The objective was to restore plant and equipment to the original design capacity, or where this could be achieved at reasonable cost, to further increase capacity. The packages were selected, based on operational requirements and on the interdependencies between processes, so that the maximum benefit is derived COHTA 11 | Issue 2 | 4 January 2013 Page 19 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension from the investment. The costing process had been undertaken to a level appropriate to the study undertaken. The TA Consultant laid much stress on the need to undertake a thorough design review and recommended that specialist water and wastewater treatment consultants be engaged to undertake the design, and to supervise the post design construction. A further recommendation was that, the case of the water treatment works, the design for all packages be carried out by a single consultant to avoid numerous interfaces between design teams. This overall design approach was not considered as critical for the wastewater treatment works design approach. The urgent works identified in the above referenced report should form the basis for planning investment in the short term. It is however, important that a longer term strategic view of the operation, maintenance and upgrade needs be undertaken to ensure a cost effective programme for further improvements in Harare Water’s operations. Finally, it must be emphasised that careful planning and co-ordination will be essential to avoid duplication and conflict with existing and other proposed projects. 8.2 Recommended next steps  Appoint consultants for detailed design and supervision;  Procure works as funding permits and as prioritised in this report; and  Commission consultants to commence strategic planning. 8.3 Current implementation The extension of the TA appointment was undertaken to provide Harare Water with the scope of work and design brief to enable them to appoint a professional services provider to undertake the design and implementation, via a variety of approaches, of selected urgent works. Subsequent to the TA extension, the Urgent Water Supply and Sanitation Rehabilitation Project (UWSSRP Project Phase One) was implemented. The two projects have similar goals, and the commonality between the two projects has led to some confusion. The UWSSRP was seen as a short term intervention, and from the Arup TA point of view did not allow for sufficient time to undertake the implementation in a conventional manner. Thus, not design was undertaken, and the project sought to replace like with like. This approach does not lead to cost effective solutions, and does not allow design to account for changed demands, nor new developments. 9 Conclusion The extension to the TA has provided Harare Water with a suite of design briefs which, if implemented, would provide them with professional engineering design services for six identified civil engineering design stages, being: COHTA 11 | Issue 2 | 4 January 2013 Page 20 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Harare Water 1031794 -Technical Assistance for Water and Wastewater Treatment Works Evaluation of project extension  Inception;  Concept and Viability (Preliminary Design);  Design Development (Detailed Design);  Documentation and Procurement;  Contract Administration and Inspection;  Close Out. COHTA 11 | Issue 2 | 4 January 2013 Page 21 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\FINAL REPORT FOR ISSUE 2 .DOCX Appendix A Design Brief PE001 Overall Design City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Prince Edward Water Treatment Works Refurbishment Design PEDB 001 Issue | 19 November 2012 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191-00 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd Arup (Pty) Ltd Postnet Suite No.93 Private Bag X1 Melrose Arch Johannesburg 2076 South Africa www.arup.com Document Verification Job title 1031794 – Technical Assistance for Water and Job number Wastewater Treatment Works in the City of Harare 219191-00 Document title Draft Project Brief – Prince Edward Water File reference Treatment Works Refurbishment Design Document ref PEDB 001 Revision Date Filename MJ Design Brief MJ008.docx Draft 1 3/10/201 Description First draft 2 Prepared by Checked by Approved by Name Andy Robertshaw Jeff Broome Mark Tindale Signature Draft 2 19 Oct Design Brief PE001 draft 2.docx 2012 Signature Issue 19 Nov Filename Design Brief PE001 issue.docx 2012 Description Prepared by Checked by Approved by Name A M Robertshaw J Broome Signature Filename Description Prepared by Checked by Approved by Name Signature Issue Document Verification with Document  PEDB 001 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF PE001 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Prince Edward Water Treatment Works Refurbishment Design Contents Page 1 Background 1 2 Scope of Work 1 3 Project Rationale and Objectives 2 3.1 Project Objectives 2 3.2 Outputs 3 4 Scope of Investigations, Survey and Design 3 4.1 Project stages 3 4.2 Required project services 4 5 Required Experience 5 5.1 Tenderer’s Experience 5 5.2 Experience of key personnel 6 PEDB 001 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF PE001 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Prince Edward Water Treatment Works Refurbishment Design 1 Background Harare Water, a semi-autonomous entity within the City of Harare, has obtained funding to implement the refurbishment programme at the Prince Edward Works. Prince Edward is the City of Harare’s secondary potable water source, with a design capacity of 90Ml/day. The Prince Edward Works has recently undergone some refurbishment of some unit processes, primarily chemical dosing and disinfection, have been considerably improved, and more recently has benefited from the replacement of More recently the works has benefited from the replacement, under the UWSSRP Phase 1 project, of chemical storage, preparation and dosing equipment, including: • Lime dosing; • Silica pumps; • Gas chlorination system. What remains is need for the overall works upgrade to be designed as a single project. Note : The Procurement of goods and services for Harare Water is conducted through the Zimbabwe State Procurement Board. 2 Scope of Work This appointment is for the appointment of a Contractor to undertake preliminary engineering design; together with recommendations for design development, construction procurement, inspection and project close out; needed to provide an overall integrated design for the entire works, which will account for the existing plant, equipment and progresses. The design will require the services of a number of specialists with experience in the design of water treatment works and covering the following fields of expertise:  Civil engineering;  Electrical engineering;  Mechanical engineering;  Process control;  Process engineering;  Structural engineering. The overall scope will include:  Inception Phase of study o Obtain all records and information on the works; o Review each unit process and prepare an overall plant schematic, showing infrastructure and current process flow o Prepare inception report detailing project objectives, constraints, refurbishment philosophy, assumptions, and propose PEDB 001 | Issue | 19 November 2012 Page 1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF PE001 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Prince Edward Water Treatment Works Refurbishment Design recommendations leading to the Concept and Viability (Preliminary Design) stage ;  Prepare the Concept and Viability report study on the refurbishment of the entire works.  Undertake preliminary design of o Overall process; o Electrical supply requirements, including power demand estimation, adequacy of bulk supply (ZESA), power use optimisation, power factor correction o Integrated control system for all parts of the works, including overall control at a Master Control Centre, but allowing local control of each unit process; o Mechanical design, piping and rotating equipment (size all major equipment) needed; o Piping, valves o Civil and structural engineering to support the installation of above plant and equipment.  Preparation of budget prices for the refurbishment;  Propose procurement method(i.e. design and constructed, turnkey, etc.) and include reasons for recommended method; and following acceptance by Harare Water proceed with procurement;  Draft tender documentation for the Design development, Construction, Contract administration and Inspection, commissioning and Close Out of the works; using as a recommended standard, the following standard form of contract; o FIDIC Conditions of Contract for Electrical and Mechanical Works including Erection on Site (Yellow Book) Third Edition 1987 contract; o FIDIC Conditions of Contract for Works of Civil, Engineering Construction (Red Book), Fourth Edition 1987 (as updated) contract o General Conditions of Contract (1984); 3 Project Rationale and Objectives 3.1 Project Objectives In order to meet the requirements of the refurbishment project, the following will need to be undertaken:  Review and document process design;  Undertake concept control, mechanical and electrical design for each Plant; PEDB 001 | Issue | 19 November 2012 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF PE001 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Prince Edward Water Treatment Works Refurbishment Design  Identify the power and control needs of each piece of equipment within the plant;  Identify the local and master control systems requirements ;  Integrate the local stand-alone control with the overall, plant wide automation and control system;  Propose the SCADA control system needed, together with equipment, cabling, signal equipment, taking in to account the countries telecommunication regulation, legal framework; operations and maintenance support networks, lightning frequency and long term system reliability  Identify civil/structural works and undertake preliminary design, including design sketches;  Identify such inspections and surveys as are needed to complete preliminary design, agree this with Harare Water counterpart then commission, and monitor progress to completion. 3.2 Outputs Design report and tender documentation, including preliminary schedule of quantities, design requirements, standards and specifications, sufficient for use by the appointed Design and Construct Contractor’s engineering team Plant is to be specified on the basis of whole life cost, reliability, durability and the availability of local capacity for service and repair. 4 Scope of Investigations, Survey and Design 4.1 Project stages The services required in delivering the assignment are described in stages defined in accordance with the South African Guideline Scope of Services and Tariff of Fees for Registered Persons.  Stage One– Inception. Establish client requirements and preferences assess user needs and options, appointment of necessary consultants, and establish the project brief including project objectives, priorities constraints, assumptions, aspirations and strategies.  Stage Two – Concept and Viability (Preliminary Design). Prepare and finalise the project concept in accordance with the brief, including project scope, scale, character, form and function, plus preliminary programme and viability of the project.  Stage Three– Design Development (Detailed Design). Develop the approved concept to finalise the design, outline specifications, cost plan, financial viability and programme for the project.  Stage Four – Documentation and Procurement. Prepare procurement and construction documentation, confirm and implement the procurement strategies and procedures for effective and timeous procurement of necessary resources for execution of the project.  Stage Five – Contract Administration and Inspection. Manage, administer and monitor the construction contracts and processes including preparation PEDB 001 | Issue | 19 November 2012 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF PE001 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Prince Edward Water Treatment Works Refurbishment Design and coordination of procedures and documentation to facilitate practical completion of the Works.  Stage Six – Close Out Fulfil and complete the project close-out including necessary documentation to facilitate effective completion, handover and operation of the project. 4.2 Required project services This appointment will require the services of a Contractor to undertake the Stage One and Stage Two as described above. 4.2.1 Stage One 4.2.1.1 Existing data The Contractor shall in the first instance obtain all the available existing documentation relating to all phases of the Prince Edward Works. 4.2.1.2 Investigations and surveys Investigations shall include at least the follow:  An assessment of the condition of all plant and equipment and their suitability for repair and reuse;  An assessment of the delivery suction, and rising mains  An assessment of the condition of equipment for each unit process;  An assessment of the safety and adequacy of the instrumentation, controls and electrical power supply. Where information necessary for design or future records are not available, the Contractor shall arrange for these surveys and investigations to be carried out. These may include:  Topographic surveys of pipeline routes, the entire works, including the abstraction point, low lift pumping, all above and below ground cables, pipelines, manholes and civil infrastructure;  Condition assessment of each building, fencing, lighting, roadways, and stormwater drainage; 4.2.1.3 Inception phase acceptance criteria The Contractor shall consult with Harare Water at the end of the Inception phase, and obtain written acceptance from Harare Water, prior to continuing to the next project phase. 4.2.2 Stage 2 – Concept and Viability (Preliminary Design) 4.2.2.1 Activities Activities covered under Stage 2 would include, but not be limited to: PEDB 001 | Issue | 19 November 2012 Page 4 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF PE001 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Prince Edward Water Treatment Works Refurbishment Design  An assessment of the design capacity of the clarifier treated;  Preliminary process design for chemical dosing, mixing, and clarification process, with process flow diagramme and preliminary equipment list  Selection of the preferred repair or replacement option;  Outline of the preferred control philosophy and instrumentation required  Valve arrangements. 4.2.2.2 Preliminary design acceptance criteria The Contractor shall consult with Harare Water at the end of the Preliminary Design phase, and written design acceptance is required from Harare Water, prior to continuing to the next project phase 5 Required Experience 5.1 Tenderer’s Experience The experience of the Tenderer, or the team provided as a joint venture, consortium, or any other form of collaborative working, will be evaluated on the basis of their experience in undertaking similar projects, either in Zimbabwe, or in SADC countries. The Tenderer is to show, with reference to his recent experience, that he is able to undertake such a project under Zimbabwean conditions. The evaluation will review the track record provided with regard to:  Management of similar programmes within the last ten years;  Practicality and successful completion of such projects to the client’s satisfaction;  Incorporation of state of the art equipment and systems;  Submission of a sufficiently well described preliminary design report, with recommendations. The description should be in tabular form with the following headings. Employer, contact Description of the Value of work Date completed person and contact works and specific provided details for both services provided person and client The scoring of the experience will be as follows. Poor No equivalent or verifiable experience, Satisfactory Five or less equivalent and verifiable projects Good Five to ten equivalent and verifiable projects Very Good More than ten equivalent and verifiable projects PEDB 001 | Issue | 19 November 2012 Page 5 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF PE001 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Prince Edward Water Treatment Works Refurbishment Design 5.2 Experience of key personnel The tenderer will be required to show, for the following key personnel, their skills, qualifications, and experiences. 5.2.1 Project Manager Registered with the ECZ and ten years’ experience with managing similar projects 5.2.2 Civil/Structural Design Engineer Registered with ECZ, and five years similar experience, degree or diploma qualified, Member of ZIE. 5.2.3 Electrical Design Engineer Registered with ECZ, and five years similar experience, degree or diploma qualified, member of ZIE. 5.2.4 Mechanical Design Engineer Registered with ECZ, and five years similar experience, degree or diploma qualified, member of ZIE. 5.2.5 Particulars The description should be in tabular form with the following headings: Name and date of birth Nationality Tertiary Qualification (degree/diploma, institution, date obtained) Current Employer, position and length of employment Outline of last ten years of experience, organisation, year, position, project, outline of assignment (showing bearing on this assignment) Score General experience Adequacy for Knowledge of assignment issues pertinent to project Poor (0 – 40) None or limited(<5 None or limited None or limited years) relevant pertinent experience(<2 knowledge(<2 years) years) Reasonable(>5years) Reasonable Reasonable Satisfactory(41- relevant pertinent 70) experience(2-5 knowledge (2-5 years) years) PEDB 001 | Issue | 19 November 2012 Page 6 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF PE001 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Prince Edward Water Treatment Works Refurbishment Design Extensive(>10years) Extensive Extensive Good (71-90) relevant pertinent experience(>5 knowledge(>5 years) years) Extensive(>20 Extensive Extensive Very Good(90+) years) relevant pertinent experience(>10 knowledge(>10 years) years) PEDB 001 | Issue | 19 November 2012 Page 7 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF PE001 OVERALL DESIGN ISSUE.DOCX Appendix B Design Brief MJ001 Clarifier Three City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade MJDB 001 Rev A | 29 October 2012 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191-00 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd Arup (Pty) Ltd Postnet Suite No.93 Private Bag X1 Melrose Arch Johannesburg 2076 South Africa www.arup.com Document Verification Job title 1031794 – Technical Assistance for Water and Job number Wastewater Treatment Works in the City of Harare 219191-00 Document title Draft Project Brief – Morton Jaffray Water File reference Treatment Works Upgrade Document ref MJDB 001 Revision Date Filename Design Brief MJ001.docx Draft 1 23 Jul Description Draft 2012 Prepared by Checked by Approved by Name Jeff Broome Andy Robertshaw Andy Robertshaw Signature Rev A 8 Nov Filename Design Brief MJ001 Clarifier Three issue for comment.docx 2012 Description Prepared by Checked by Approved by Name Signature Filename Description Prepared by Checked by Approved by Name Signature Filename Description Prepared by Checked by Approved by Name Signature Issue Document Verification with Document  MJDB 001 | Rev A | 29 October 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ001 CLARIFIER THREE ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade Contents Page 1 Background 1 1.1 Design Brief 1 2 Project Rationale and Objectives 1 2.1 Brief description of the clarifier operation 1 2.2 Project Objectives 2 3 Proposed Solution 2 3.1 Investigation activities 2 3.2 Survey 3 3.3 Design, construct and hand over 3 4 Scope of Investigations, Survey and Design 4 4.1 Project stages 4 4.2 Stage 1– Inception 5 4.3 Stage 2 – Concept and Viability (Preliminary Design) 5 4.4 Stage 3– Design Development (Detailed Design) 6 4.5 Stage 4 – Documentation and Procurement 7 4.6 Stage 5 – Contract Administration and Inspection 8 4.7 Acceptance testing 8 4.8 Other testing and commissioning 8 4.9 Stage 6 – Close Out 8 MJDB 001 | Rev A | 29 October 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ001 CLARIFIER THREE ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade 1 Background Harare Water, a semi-autonomous entity within the City of Harare, has obtained funding to implement the refurbishment programme at the Morton Jaffray Works. Clarifier Three, a 115Ml/d, 27.43m diameter Paterson proprietary Accelerator type clarifier, was installed at the Morton Jaffray Works, together with 14 new rapid gravity filters, dosing and pumping plant, to increase potable water production from 45Ml/d to 160Ml/d. Clarifier Three has subsequently been decommissioned and no longer forms part of the treatment process. The Southern African agent for the Paterson clarifier are PCI Africa of Johannesburg South Africa, who have confirmed it is possible to refurbish the Accentrifloc plant, complete with electrical, mechanical and control equipment. Note : The Procurement of goods and services for Harare Water is conducted through the Zimbabwe State Procurement Board. 1.1 Design Brief It is proposed to appoint an experienced and competent Professional Services Provider (PSP) to undertake; for the Accentrifloc Clarifier at the Morton Jaffray Works; the following services:  Design;  Construction;  Installation;  Testing;  Commissioning and handing over. 2 Project Rationale and Objectives Clarifier Three has been out of commission for many years, and it is proposed to refurbish the clarifier to full operation. The clarifier is a Paterson International Ltd upward flow clarifier of type known originally as an Accelator, and current referred to as the Accentrifloc. The clarifier is a solids contract clarifier, often referred to as a “sludge blanket” tank. The clarifier is designed to function with chemical treatment (coagulation), and may require correction for optimal operation. The clarifier has a design through put of 115MlD. 2.1 Brief description of the clarifier operation The following unit processes occur within the clarifier:  Dosing; MJDB 001 | Rev A | 29 October 2012 Page 1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ001 CLARIFIER THREE ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade  Primary Mixing;  Secondary Reaction;  Clarification;  Discharge to filtration  Sludge concentration and draw off ; 2.2 Project Objectives In order to meet the requirements of the refurbishment project, the following works need to be undertaken to:  Refurbish the structural, mechanical and electrical condition of Clarifier Three;  Return Clarifier Three to full and safe operating condition, able to meet the required duty of 115Ml/d ;  Integrate the Clarifier Three stand-alone control with the overall, plant wide automation and control system. The Water Treatment Works will continue to operate and the refurbishment will take place whilst the resort of the plant continues to operate. The work shall be undertaken in a safe manner that does not interfere with the normal operation of the works, and so as not to jeopardise the continuity of potable water supply. 3 Proposed Solution In order to meet the requirements of the refurbishment project, the following works need to be undertaken: • Design, supply, deliver, install, test and commission the Clarifier’s mechanical, electrical and automation and control systems. 3.1 Investigation activities • Prepare the Clarifier for inspection by draining and cleaning; • Conduct a thorough inspection of the Clarifier and surrounding portion of the plant, hand proofing for existing above ground and buried services; • Preparation, and after approval, implementation of a safe programme of works to disconnect and make safe, dismantle and remove all the existing derelict mechanical and electrical equipment to a place designated by Harare Water; • Conduct an integrity assessment, and report on, the structural condition on the reinforced concrete structure of the Clarifier; • Conduct mechanical and corrosion condition inspections of all pipeworks, valves and fittings, hydraulically test all competent pipework, valves and fittings, and prepare a schedule, with specifications acceptable to Harare Water, of all replacement equipment ; • Check the inlet and outlet controls, including such controls as are necessary for full automation; MJDB 001 | Rev A | 29 October 2012 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ001 CLARIFIER THREE ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade 3.2 Survey • Survey the clarifier and surrounds to provide a baseline survey of Plant One to an accuracy of 0.001m (1mm). The spots shots should be not more than 15m apart and be sufficient to allow the drafting of a contour plan with 0.5m contour intervals. The Surveyor is to use the Zimbabwean accepted coordinate system. • The extent of the survey sufficient to show the topography, all existing buildings, roads, structures, services and pipelines, and in particular to reflect the linkage of the Clarifier to the : o raw water inlet chamber; o the chemical dosing house; o the filtration buildings. The survey shall note surface and below pipelines, manholes and power cables, light poles and other services. The survey data shall be processed and the resultant information be made available in electronic format; • Establish at least two project survey Bench Marks(Control Points) in such locations as will allow ease of both reference and of construction; 3.3 Design, construct and hand over • Design and construct such structural work, including water proofing, as is necessary to ensure the structural integrity of the clarifier; • Replace, as required, the inlet and outlet controls, including such controls as are necessary for full automation; • Supply and install all interconnecting pipework for the chemical dosing, and mixing system, to ensure efficient chemical coagulation and flocculation. The scope to refurbish the chemical dosing system will need to include an extension of the chemical dosing system to dose flocculent into the small funnel in the centre of the clarifier; • All other civil, mechanical and electrical works needed to make the Clarifier fully functional, noting the need of ease of access for maintenance; • Provision of, and integration into the existing installation, the electrical power distribution network required; • Automation of the Clarifier including a proposal for linkage to a PLC/SCADA system (including a functional design specification of the system, programming, instrumentation, controls and cabling); • Planning and scheduling the works, record keeping, reporting on the progress; • Appointment of other specialist Contractors, if and as required; • Commission the entire clarification operation, including integration with overall control; • Provide Operations and Training manuals for the Clarifier; • Train the operations staff in the operations and maintenance of the clarifier. MJDB 001 | Rev A | 29 October 2012 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ001 CLARIFIER THREE ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade Note the philosophy to be adopted is that the existing plant and equipment is to be reused to the maximum extent possible that is consistent with economic, safety and reliability considerations. Plant is to be specified on the basis of whole life cost, reliability, durability and the availability of local capacity for service and repair. 4 Scope of Investigations, Survey and Design 4.1 Project stages The services required in delivering the assignment are described in stages defined in accordance with the South African Guideline Scope of Services and Tariff of Fees for Registered Persons 2010. The stages are Stage 1– Inception Establish client requirements and preferences, assess user needs and options, appointment of necessary consultants, establish the project brief including project objectives, priorities constraints, assumptions, aspirations and strategies. Stage 2 – Concept and Viability (Preliminary Design) Prepare and finalise the project concept in accordance with the brief, including project scope, scale, character, form and function, plus preliminary programme and viability of the project. Stage 3– Design Development (Detailed Design) Develop the approved concept to finalise the design, outline specifications, cost plan, financial viability and programme for the project. Stage 4 – Documentation and Procurement Prepare procurement and construction documentation, confirm and implement the procurement strategies and procedures for effective and timeous procurement of necessary resources for execution of the project. Stage 5 – Contract Administration and Inspection Manage, administer and monitor the construction contracts and processes including preparation and coordination of procedures and documentation to facilitate practical completion of the Works. Stage 6 – Close Out Fulfil and complete the project close-out including necessary documentation to facilitate effective completion, handover and operation of the project. MJDB 001 | Rev A | 29 October 2012 Page 4 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ001 CLARIFIER THREE ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade 4.2 Stage 1– Inception 4.2.1 Existing data The Contractor shall in the first instance obtain all the available existing documentation relating to Clarifier Three and its integration into overall Plant One processes. 4.2.2 Investigations and surveys Investigations shall include at least the following:  An assessment, and report on, the structural integrity of the Clarifier;  An assessment, and report on, the condition of all electrical and mechanical equipment and their suitability for repair and reuse;  An assessment , and report on, the condition of the inflow, outflow, sludge drain and discharge pipes;  An assessment, and report on, the safety and adequacy of the electrical power supply, and any electro/mechanical controls, including cabling. Where information necessary for design or future records are not available, the Contractor shall arrange for these surveys and investigations to be carried out. These may include:  Topographic surveys of pipeline routes; and  Surveys of the clarifier, chambers and existing installations;  Other surveys as required for the PSP to fully understand the condition, interconnection, integrity and operability of the completed works. Note that all data that has a spatial reference shall be captured in a GIS compatible formation, acceptable to Harare Water and all engineering drawings, maps, details pertaining to concept and preliminary design shall be prepared in ArcGIS/AutoCAD format. 4.2.3 Inception Phase Acceptance Criteria The Contractor shall prepare a report on the findings, with recommendations for the cost effective refurbishment of the Clarifier. In the event the Clarifier may be cost effectively refurbished, the PSP is to obtain written approval from Harare Water, prior to continuing to the Concept and Viability Stage 4.3 Stage 2 – Concept and Viability (Preliminary Design) 4.3.1 Activities Activities covered under Stage 2 would include, but not be limited to:  Selection of the preferred repair or replacement option; MJDB 001 | Rev A | 29 October 2012 Page 5 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ001 CLARIFIER THREE ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade  An assessment of the design capacity of the refurbished clarifier;  Preliminary process design, including the chemical dosing, mixing, and clarification process, with process flow diagramme and preliminary equipment list;  An outline design of the preferred control philosophy and instrumentation required;  Interconnection arrangements. Note that all data that has a spatial reference shall be captured in a GIS compatible formation, acceptable to Harare Water and all engineering drawings, maps, details pertaining to concept and preliminary design shall be prepared in ArcGIS/AutoCAD format. 4.3.2 Preliminary Phase Acceptance Criteria The Contractor shall consult with Harare Water at the end of the Preliminary Design phase, and written design acceptance is required from Harare Water, prior to continuing to the next project phase. 4.4 Stage 3– Design Development (Detailed Design) 4.4.1 Design The design works shall include at least the following:  Confirmation of the design capacity of the clarifier ;  Process design for chemical dosing, mixing, and clarification process;  Detailed repair of civil, structural and mechanical plant and equipment;  Final control PLC design, P&ID and equipment list and instrumentation required;  Transient analysis, particularly for the effects of loss of power;  Design of all pipework, manifolds, valves, and interconnection arrangements;  Design of all required repairs and improvements to the pumps and chemical dosing building, chambers and associated structures;  Design of all required electrical and control works, final control PLC design, P&ID and equipment list and instrumentation required.  Detailed life cycle costing of options and determination of liquidated damages that will be applicable for under performance of pumps, etc. 4.4.2 Detailed Design Phase Acceptance Criteria The Contractor shall consult with Harare Water at the end of the Detailed Design phase, and written design acceptance is required from Harare Water, prior to continuing to the next project phase. MJDB 001 | Rev A | 29 October 2012 Page 6 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ001 CLARIFIER THREE ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade 4.5 Stage 4 – Documentation and Procurement 4.5.1 Contents of Tender Documents 4.5.1.1 Form of Contract The form of contract is likely to be determined to a large extent by the funding agency’s requirements and the amount of design for which the Contractor will be responsible, rather than any preference of Harare Water. The requirements for the Appendix to the form of contract and Special Conditions of Contract are dealt with in general terms of the FIDIC Short Form of Contract in the General Project Brief. 4.5.1.2 Specification The Specification will be based on the relevant sections of the Standard Specification the SAZS and SANS 1200. Any additions and modifications to the requirements of SANS shall be incorporated in the particular Specification and shall be framed in accordance with the requirements of SANS 1200. Additional standards will be in SAZS standards, where available, or British or other internationally recognised standards. The Particular Specification shall define at least the following:  Location and limits of the site;  Security requirements and procedures;  Access to site;  Handover of the site including responsibilities for isolation of services and any diversions required;  Facilities to be provided by the Employer;  Facilities to be provided by the Contractor, including accommodation and facilities for staff and the Employer;  Applicable legislation’ including employees’ protection and environmental protection;  Health and safety requirements;  Contractor’s liabilities, including for pollution incidents;  Contractor’s design responsibilities and liabilities;  Conditions and procedures for Takeover by the Employer. 4.5.1.3 Contractor’s documentation The specification shall define the documentation to be provided by the Contractor. In particular it should specify the format and content of the required documents that should include:  Requirements for the tender programme specifying format, milestones etc.;  Risk assessments and method statements for particular activities; MJDB 001 | Rev A | 29 October 2012 Page 7 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ001 CLARIFIER THREE ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade  A detailed commissioning plan;  Scale and accuracy for ‘as built’ and design drawings;  Items of work for which calculations are required;  Construction completion report;  Operations and maintenance manuals; and  Inputs to a health and safety file for the project including details of suppliers and particular risks associated with the operation, maintenance and decommissioning of the works. 4.6 Stage 5 – Contract Administration and Inspection The Contractor shall provide suitably qualified and experienced staff to control and supervise construction. 4.7 Acceptance testing Requirements for acceptance testing for pumps and other equipment shall be specified including:  Requirements for witnessing of tests  Grade of acceptance testing required for electrical and mechanical equipment  Responsibility for costs of testing and witnessing. 4.8 Other testing and commissioning Particular attention should be paid to defining the type, frequency and required standards for testing. The requirements for Commissioning shall be specified in details including responsibility for supply of equipment, responsibility for costs of consumables for initial testing and re-testing where necessary. 4.9 Stage 6 – Close Out 4.9.1.1 Contractor’s documentation The Contractor shall, in addition to the documentation previously prepared and submitted under Phases 1 to 4, deliver the following documentation:  All background information collected and results of surveys and investigations conducted;  Risk assessments and method statements for particular activities;  The detailed commissioning plan;  ‘as built’ and design drawings;  Items of work for which calculations are required; MJDB 001 | Rev A | 29 October 2012 Page 8 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ001 CLARIFIER THREE ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade  Construction records;  Construction completion report;  Operations and maintenance manuals, including brochures, specifications, maintenance requirements, list of operation spares;  Inputs to a health and safety file for the project including details of suppliers and particular risks associated with the operation, maintenance and decommissioning of the works;  A health and safety file including the basis of design, particular risks associated with the operation, maintenance and decommissioning of the works and contact details for all parties involved. MJDB 001 | Rev A | 29 October 2012 Page 9 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ001 CLARIFIER THREE ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade Sketch One: Cross Section through the Accelator, showing rough measures for information only MJDB 001 | Rev A | 29 October 2012 Page 10 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ001 CLARIFIER THREE ISSUE.DOCX Appendix C Design Brief MJ002 Flow Control City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade MJDB 002 inlet control valves Issue | 19 November 2012 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191-00 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd Arup (Pty) Ltd Postnet Suite No.93 Private Bag X1 Melrose Arch Johannesburg 2076 South Africa www.arup.com Document Verification Job title 1031794 – Technical Assistance for Water and Job number Wastewater Treatment Works in the City of Harare 219191-00 Document title Draft Project Brief – Morton Jaffray Water File reference Treatment Works Upgrade Document ref MJDB 002 inlet control valves Revision Date Filename Design Brief MJ002.docx Draft 1 23 Jul Description First draft 2012 Prepared by Checked by Approved by Name Jeff Broome Andy Robertshaw Andy Robertshaw Signature Draft 2 16 Oct Filename Design Brief MJ002 Flow control draft two.docx 2012 Description Prepared by Checked by Approved by Name Signature Issue 19 Nov Filename Design Brief MJ002 Flow control issue.docx 2012 Description Prepared by Checked by Approved by Name Signature Filename Description Prepared by Checked by Approved by Name Signature Issue Document Verification with Document  MJDB 002 inlet control valves | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ002 FLOW CONTROL ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade Contents Page 1 Background 1 2 Project Rationale and Objectives 1 3 Description of flow control works 2 3.1 Abstraction 2 3.2 Mixing Chamber 3 3.3 Plant One Splitter Box and Dosing Chamber 4 4 Proposed Solution 5 5 Scope of Investigations, Survey and Design 6 5.1 Project stages 6 5.2 Stage 1– Inception 7 5.3 Stage 2 – Concept and Viability (Preliminary Design) 8 5.4 Stage 3– Design Development (Detailed Design) 8 5.5 Stage 4 – Documentation and Procurement 9 5.6 Stage 5 – Contract Administration and Inspection 10 5.7 Acceptance testing 10 5.8 Other testing and commissioning 10 5.9 Stage 6 – Close Out 11 MJDB 002 inlet control valves | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ002 FLOW CONTROL ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade 1 Background Harare Water, a semi-autonomous entity within the City of Harare, has obtained funding to implement the refurbishment programme at the Morton Jaffray Works. This Tender notice is for the complete refurbishment of the Morton Jaffray inflow control and is for a single design, supply, construct, commission and handover contract. The Tender is to:  Supply and install screening and control values in the Lake Chivero Intake Tower;  Supply and install control inflow and outflow valves in the mixing chamber of Morton Jaffray Works  Refurbish the Plant One Splitter Box and Dosing Chamber, complete with sliding gates, automation and control, safety railings. Note : The Procurement of goods and services for Harare Water is conducted through the Zimbabwe State Procurement Board. 2 Project Rationale and Objectives Currently there is little mechanical control of the flow of water at the mixing chamber. Flow from Lake Chivero can be cut off by manually closing butterfly valves in the Intake Tower, while Lake Manyame flows can be prevented by switching off the Darwendale pumps. The flows into the chamber are characterised by irregular and powerful surges that are not totally contained within the chamber, and result in the chamber being constantly drenched. This has led to accelerated corrosion of plant and equipment, and increased the risk to workers needing to access the chamber. Further, the water entering the works is very well aerated, with negative treatment consequences. This project is to assess the control system, and then to design, procure new valves, repair or replace the two existing Larner Johnson needle valves, install, test and commission the control valves. The electrical supply, required to power the electrically actuated valves, shall be replaced and a control system with local override and designed to link to a SCADA control system is also required. The objective of the tender is to return the automatic control of the flow into the works to full operating condition. MJDB 002 inlet control valves | Issue | 19 November 2012 Page 1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ002 FLOW CONTROL ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade 3 Description of flow control works 3.1 Abstraction 3.1.1 Intake Tower Intake Tower Two was constructed in 1973 to allow abstraction at different levels in the water body, via four steel periscope shaped intake tubes, each 1355mm (53”) internal diameter. At high or moderate lake levels only one intake may be needed, but all four are need ed when water level is very low and abstraction rate high. Each periscope is provided with a fixed screen of 75mm square mesh screen to prevent large debris entering the works. The periscope intake tubes are suspended by steel wire ropes from hand operated winches, situated on the operating deck of the tower. 3.1.2 Level indicators Each winch has a calibrated level indicator. The indicator shows the depth to the centre of the screen opening. The range of the indicator is some 10m showing levels from 1365m MSL down to 1355,5m MSL. The intake tower was constructed with a north east tilt angle of 1:67 to the vertical; hence intake tubes are not truly vertical, but the winch hoist installation has accounted for this in the following manner. The lead of the grooves on the rope drum was fixed so that the changes in the vertical position of the rope as it winds up and down, compensates for the deviation from the vertical of the intake housings. Conical steel entry guides were fixed on the north, south, east and west intake projections, to ensure the bottom of the intake tube would readily enter without jamming, steel guide fins are also provided on the bottom ends of the intake tubes to assist smooth raising and lowering. Note that during construction some temporary sealing beams were left on the east and west intake housings, allowing the east and west intakes to operate at slightly higher levels. 3.1.3 Intake positions Each intake has a slightly different top and bottom opening elevation, and these levels are indicated in the table below. Intake position Lowest screen centre line Highest screen centre line level level North 1355.51m 1360.69m South 1355.60m 1360.78m MJDB 002 inlet control valves | Issue | 19 November 2012 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ002 FLOW CONTROL ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade East 1356.88m 1362.15m West 1359.71m 1365.05m Note 1: The west intake has a fibreglass skirt (2.4m deep) to allow abstraction at a higher lake water level than the other intakes. Do not lower the west intake below lowest level indicated as the skirt cannot support the weight of the intake and thus may be severely damaged. Note 2 : The highest levels indicate allow 0.3m of the periscope tube to remain within the slide housing collar, however, this may result in increased volumes of water entering through the collar level. Intake internal faces were painted with 2 coats of 1/8” bitumen coating, external surfaces were painted with black bituminous paint, except the portion which will be abraded in operation, and will eventually corrode. In the event that the periscopes require repair or maintenance, the periscopes may be raised and removed. A suggested procedure will include at least the following:  Obtain floating lifting plant;  Close intake valve, and remove periscope;  Raise periscope, using dedicated winch until the periscope appears above water level;  Attach the lifting cable, capable of lifting the periscope to the floating crane and winch until the load of the periscope is taken by the crane;  Disconnect the intake tower’s dedicated raising cable and disconnect;  Stow the cable then lift the periscope about the guide screen range and remove;  Remove the periscope to maintenance workshop, repair the periscope, and check.  Remove bitumen coating, abrade and clean and recoat with Copon, or equal and approved;  Allow coating to cure;  Replace in same manner as removed;  Open intake valve and resume production. 3.2 Mixing Chamber Water flows under gravity into the mixing chamber from Lake Chivero, and is also pumped into the same chamber works from Lake Manyame, via the Darwendale pumps. The Lake Chivero water flows in through two 1200mm Larner Johnson inline flow control valves, and through an 1800mm MJDB 002 inlet control valves | Issue | 19 November 2012 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ002 FLOW CONTROL ISSUE.DOCX Figure 1 Larner Johnson control valves City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade butterfly valve. The Larner Johnson valves have been jammed in a partially opened position. The1800mm butterfly valve, which was installed to allow freer flow at low dam levels, was removed for repair and a spool piece installed to allow flow into the chamber. The two butterfly valves were recoated and returned to site. Pending installation, the valves were unloaded alongside the riser shaft, and left exposed to the elements. Subsequently the 1800mm butterfly valve actuator was damaged and the rubber coating damaged by the sun. The Manyame water enters via a steel pipeline from the Darwendale pumps, and was controlled by a 1380mm butterfly valve, which like the 1800mm valve was removed for repair and a spool piece installed to allow flow into the chamber. Currently, there is no way to mechanically control the flow of water at the mixing chamber. Flow from Lake Chivero can be cut off by manually closing butterfly valves in the Intake Tower, while Lake Manyame flows can be prevented by switching off the Darwendale pumps. The flows into the chamber are characterised by irregular and powerful surges that are not totally contained within the chamber, and results in the chamber and surrounds being constantly drenched. This has led to accelerated corrosion of access gangway, safety rails and grid floor, plus electrical installation and lighting, and has increased the Health and Safety risk to workers needing to access the chamber. Operations staff noted that the Figure 2 Morton Jaffray Mixing Chamber surging phenomenon began after the control valves were removed, and it is considered the surging could be overcome by the replacement of the valves. A method to achieve safe and speedy replacement of the valves, shall be developed, and agreed prior to the removal of any valve. The chamber was designed to allow the chamber to be isolated from the inlet valves using a sliding plate, but the gate slides have corroded, while the sliding plates are no longer on site. The method used should allow the plant to continue operating at reduced production as first the Chivero intake would be isolated, the chamber sealed and the valves installed, but allowing the Manyame source to be used. From the Mixing Chamber the flow is divided between two plants that are each fed by a separate pipeline the flow being controlled by butterfly valves on each. 3.3 Plant One Splitter Box and Dosing Chamber The original Plant One Splitter Box and Dosing Chamber is situated next to the Plant One Dosing and control room and adjacent to Clarifiers One and Two. The MJDB 002 inlet control valves | Issue | 19 November 2012 Page 4 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ002 FLOW CONTROL ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade flow entering the Splitter Box is dosed and, through a number of sliding gates, is directed to each of the seven Plant One clarifiers. The Splitter Box is in poor condition, and requires concrete repairs, water proofing, new sliding gates, grids and safety rails. The refurbishment will require stand-alone controls which shall be designed to integrate with a proposed overall, plant wide automation and control system. 4 Proposed Solution The following works need to be undertaken: • Fabricate and replace the four number 1.8 m diameter, 75mm mesh, stainless steel fish screens on the Lake Chivero Intake Tower periscope intakes; • Replace the periscope abstraction point guides and cable level adjustment system controlling the depth of each periscope intake; • Supply and installation of two electrically power modulating actuators for 1400mm butterfly valves; • Supply and installation of one 1800mm diameter flanged PN10 rubberised inlet control butterfly valve, two number eccentric reducers (2200mm to 1800mm) and plain end pipe connectors, complete with electrically powered actuator and quarter turn gearbox; • Supply and installation of one 1800mm diameter flanged PN10 rubberised butterfly valve in the quiescent chamber to control flow to Plant Two and Plant Three, complete with electrically powered actuator and quarter turn gearbox; • Supply and installation of two (one on inlet from Lake Manyame and one on pipe feeding Plant One) number 1350mm diameter flanged PN10 rubberised butterfly valves, complete with electrically operated modulating actuators and quarter turn gearboxes; • Conduct an on-site “health check” of the two existing Larner Johnson 1200mm diameter inline flow control (‘needle”) valves both externally and internally, using an endoscope camera with full video back up, and supply a technical report. The report shall provide a recommendation on whether the valves can be fully refurbished and brought back to an as new condition or, if beyond economical repair, replaced with a new valve. • Refurbish the two existing 1200mm diameter inline flow control (‘needle”) valves, complete with power supply, electric modulating actuator, flow control system, and pressure control valve, or should these be uneconomical to refurbish, supply and install two new 1200mm diameter inline flow control (‘needle”) valves, complete with power supply, electric modulating actuator, flow control system, pressure valve; • Refurbish the Plant One Splitter Box and Dosing Chamber, including the concrete repairs, water proofing, supply and installation of sliding gates, grids and safety rails. The refurbishment will require stand-alone controls which shall be designed to integrate with a proposed overall, plant wide automation and control system. MJDB 002 inlet control valves | Issue | 19 November 2012 Page 5 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ002 FLOW CONTROL ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade • Provide and install the necessary electrical control panel, instrumentation control, manual override. • Provide power supply, including lighting, maintenance power sockets; • Remove the valve manhole pre-cast concrete roofing slabs, check to structural integrity and replace. Fabricate new missing or damaged roof slabs and install; • Remove all the existing derelict mechanical and electrical equipment; • Conduct a mechanical and corrosion condition inspection of all pipeworks, valves and fittings, hydraulically test and retain all competent pipework, valves and fittings, and schedule all replacement equipment ; • Supply and install all interconnecting pipework for the chemical dosing, and mixing system, to ensure efficient chemical coagulation and flocculation; • All other civil, mechanical and electrical works needed to make the Lake Chivero Intake Tower and Morton Jaffray Mixing Chamber fully functional; • Commission the entire control system, including integration with overall control; • Provide Operations and Training manuals for the Control systems; • Train the operations staff in the operations and maintenance of the control system. Note the philosophy to be adopted is that the existing plant and equipment is to be reused to the maximum extent possible that is consistent with economic, safety and reliability considerations. Plant is to be specified on the basis of whole life cost, reliability, durability and the availability of local capacity for service and repair. The flow control system is an integral part of an operational water treatment works, and numerous cables, pipes and other foreign services have been installed at various stages of the Morton Jaffray Plant life. The Plant is required to continue to operate whilst the replacement operation is in progress, and the Service Provider is to prepare a plan showing how the operation of the works is not compromised by this refurbishment and replacement project. 5 Scope of Investigations, Survey and Design 5.1 Project stages The services required in delivering the assignment are described in stages defined in accordance with the South African Guideline Scope of Services and Tariff of Fees for Registered Persons 2010. The stages are Stage 1– Inception Establish client requirements and preferences, assess user needs and options, appointment of necessary Contractors, and establish the project brief including project objectives, priorities constraints, assumptions, aspirations and strategies. Stage 2 – Concept and Viability (Preliminary Design) MJDB 002 inlet control valves | Issue | 19 November 2012 Page 6 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ002 FLOW CONTROL ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade Prepare and finalise the project concept in accordance with the brief, including project scope, scale, character, form and function, plus preliminary programme and viability of the project. Stage 3– Design Development (Detailed Design) Develop the approved concept to finalise the design, outline specifications, cost plan, financial viability and programme for the project. Stage 4 – Documentation and Procurement Prepare procurement and construction documentation, confirm and implement the procurement strategies and procedures for effective and timeous procurement of necessary resources for execution of the project. Stage 5 – Contract Administration and Inspection Manage, administer and monitor the construction contracts and processes including preparation and coordination of procedures and documentation to facilitate practical completion of the Works. Stage 6 – Close Out Fulfil and complete the project close-out including necessary documentation to facilitate effective completion, handover and operation of the project. 5.2 Stage 1– Inception 5.2.1 Existing data The Contractor shall in the first instance obtain all the available existing documentation relating to the Lake Chivero Intake Tower, the Morton Jaffray Mixing Chamber, and Plant One flow control, together with details of their integration into overall Plant One processes. 5.2.2 Investigations and surveys Investigations shall include at least the follow:  An assessment of the condition of all valves, grids, operating equipment and the suitability for repair and reuse;  An assessment of the condition of the intake works and mixing chamber, inflow, outflow, and discharge pipe  A ‘Larner Johnson Health Check’ on the two inlet control valves (See Appendix A); and;  An assessment of the safety and adequacy of the electrical power supply. Where information necessary for design or future records are not available, the Contractor shall arrange for these surveys and investigations to be carried out. These may include:  Surveys of the Intake Tower, Mixing chamber and Plant One Splitter Box, chambers and existing installations; MJDB 002 inlet control valves | Issue | 19 November 2012 Page 7 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ002 FLOW CONTROL ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade 5.2.3 Inception Phase Acceptance Criteria The contractor shall consult with Harare Water at the end of the Inception Phase, and obtain written acceptance from Harare Water, prior to continuing to the next design and construct. 5.3 Stage 2 – Concept and Viability (Preliminary Design) 5.3.1 Activities Activities covered under Stage 2 would include, but not be limited to:  An assessment of the valve requirements;  Process flow diagramme and preliminary equipment list  Selection of the preferred repair or replacement option;  Outline of the preferred control philosophy and instrumentation required  Valve arrangements. 5.3.2 Preliminary Phase Acceptance Criteria The contractor shall consult with Harare Water at the end of the Preliminary Design phase, and written design acceptance is required from Harare Water, prior to continuing to the next project phase. 5.4 Stage 3– Design Development (Detailed Design) 5.4.1 Design The design works shall include at least the following:  Confirmation of the selection of the valves ;  Detailed repair of civil, structural and mechanical plant and equipment ;  Valve arrangements.  Design of all pipework, manifolds, valves, etc,  Design of all required repairs and improvements to the pumpstation building, chambers and associated structures; and  Design of all required electrical and control works, final control PLC design, P&ID and equipment list and instrumentation required.  Detailed life cycle costing of options and determination of liquidated damages that will be applicable for under performance of pumps, etc. MJDB 002 inlet control valves | Issue | 19 November 2012 Page 8 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ002 FLOW CONTROL ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade 5.4.2 Detailed Design Phase Acceptance Criteria The contractor shall consult with Harare Water at the end of the Detailed Design phase, and written design acceptance is required from Harare Water, prior to continuing to the next project phase. 5.5 Stage 4 – Documentation and Procurement 5.5.1 General This project shall be tendered on a design and build basis. The Contractor is to clearly identify the elements designed by the Contactor. The total extent of investigations, surveys and design work required will not be reduced, all items identified in section 4 of this Brief must be included either in either the Contractor’s and Client’s scope. 5.5.2 Contents of Tender Documents 5.5.2.1 Form of Contract The form of contract is likely to be determined to a large extent by the funding agency’s requirements and the amount of design for which the Contractor will be responsible, rather than any preference of Harare Water. The requirements for the Appendix to the form of contract and Special Conditions of Contract are dealt with in general terms of the FIDIC Short Form of Contract in the General Project Brief. 5.5.2.2 Specification The Specification will be based on the relevant sections of the Standard Specification the SAZS and SANS 1200. Any additions and modifications to the requirements of SANS shall be incorporated in the particular Specification and shall be framed in accordance with the requirements of SANS 1200. Additional standards will be in SAZS standards, where available, or British or other internationally recognised standards. The Particular Specification shall define at least the following:  Location and limits of the site;  Security requirements and procedures;  Access to site;  Handover of the site including responsibilities for isolation of services and any diversions required;  Facilities to be provided by the Employer;  Facilities to be provided by the Contractor, including accommodation and facilities for staff and the Employer;  Applicable legislation’ including employees’ protection and environmental protection;  Health and safety requirements; MJDB 002 inlet control valves | Issue | 19 November 2012 Page 9 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ002 FLOW CONTROL ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade  Contractor’s liabilities, including for pollution incidents;  Contractor’s design responsibilities and liabilities;  Conditions and procedures for Takeover by the Employer. 5.5.2.3 Contractor’s documentation The specification shall define the documentation to be provided by the Contractor. In particular it should specify the format and content of the required documents that should include:  Requirements for the tender programme specifying format, milestones etc.;  Risk assessments and method statements for particular activities;  A detailed commissioning plan;  Scale and accuracy for ‘as built’ and design drawings;  Items of work for which calculations are required;  Construction completion report;  Operations and maintenance manuals; and  Inputs to a health and safety file for the project including details of suppliers and particular risks associated with the operation, maintenance and decommissioning of the works. 5.6 Stage 5 – Contract Administration and Inspection The Contractor shall provide suitably qualified and experienced staff to supervise construction. 5.7 Acceptance testing Requirements for acceptance testing for valves and other equipment shall be specified including:  Requirements for witnessing of tests  Grade of acceptance testing required for electrical and mechanical equipment  Responsibility for costs of testing and witnessing. 5.8 Other testing and commissioning Particular attention should be paid to defining the type, frequency and required standards for testing. The requirements for Commissioning shall be specified in details including responsibility for supply of equipment, responsibility for costs of consumables for initial testing and re-testing where necessary. Following commissioning of the whole of the works, but before takeover by the employer, a reliability test shall be carried out, during which the works shall be operated by the Contractor and the performance and all failures and interventions required to ensure proper operation of automated systems shall be recorded. If any process critical equipment or MJDB 002 inlet control valves | Issue | 19 November 2012 Page 10 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ002 FLOW CONTROL ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade controls fail during the period, the Contractor shall repair the fault and restart the test. Where equipment is configured in a duty/standby arrangement, the failure of duty item of equipment shall not be classed as a failure provided the standby unit takes over and operates correctly for the remainder of the reliability test period. 5.9 Stage 6 – Close Out 5.9.1.1 Contractor’s documentation The Contractor shall deliver the following documentation in addition to the tender documentation issued at Stage 4: All background information collected and results of surveys and investigations conducted; A health and safety file including the basis of design, particular risks associated with the operation, maintenance and decommissioning of the works and contact details for all parties involved. MJDB 002 inlet control valves | Issue | 19 November 2012 Page 11 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ002 FLOW CONTROL ISSUE.DOCX Appendix D Design Brief MJ 003 Paterson Filter Refurbishment City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade MJDB 003 Paterson Filter Galley Issue | 19 November 2012 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191-00 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd Arup (Pty) Ltd Postnet Suite No.93 Private Bag X1 Melrose Arch Johannesburg 2076 South Africa www.arup.com Document Verification Job title 1031794 – Technical Assistance for Water and Job number Wastewater Treatment Works in the City of Harare 219191-00 Document title Draft Project Brief – Morton Jaffray Water File reference Treatment Works Upgrade Document ref MJDB 003 Paterson Filter Galley Revision Date Filename Design Brief MJ003.docx Draft 1 23 Jul Description First draft 2012 Prepared by Checked by Approved by Name Jeff Broome Andy Robertshaw Andy Robertshaw Signature Draft 2 16 Nov Filename Design Brief MJ003 Paterson Filters draft two.docx 2012 Description Complete refurbishment of the Morton Jaffray Plant One ‘Paterson” filters Prepared by Checked by Approved by Name Signature Issue 19 Nov Filename Design Brief MJ003 Paterson Filter Refurbisment issue.docx 2012 Description Prepared by Checked by Approved by Name Signature Filename Description Prepared by Checked by Approved by Name Signature Issue Document Verification with Document  MJDB 003 Paterson Filter Galley | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ003 PATERSON FILTER REFURBISHMENT ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade Contents Page 1 Background 1 2 Project Rationale and Objectives 1 3 Proposed Solution 1 4 Scope of Investigations, Survey and Design 2 4.1 Project stages 2 4.2 Stage 2 – Concept and Viability (Preliminary Design) 3 4.3 Stage 3– Design Development (Detailed Design) 4 4.4 Stage 4 – Documentation and Procurement 4 4.5 Stage 5 – Contract Administration and Inspection 5 4.6 Acceptance testing 5 4.7 Other testing and commissioning 6 4.8 Stage 6 – Close Out 6 MJDB 003 Paterson Filter Galley | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ003 PATERSON FILTER REFURBISHMENT ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade 1 Background Harare Water, a semi-autonomous entity within the City of Harare, has obtained funding to implement the refurbishment programme at the Morton Jaffray Works. This Tender notice is for the appointment of a Contractor for the complete refurbishment of the Morton Jaffray Plant One Paterson Filter galley refurbishment. Note : The Procurement of goods and services for Harare Water is conducted through the Zimbabwe State Procurement Board. 2 Project Rationale and Objectives The Morton Jaffray (MJ) Water Treatment Works, with a design capacity of 614Mld, is located below Lake Chivero, outside Harare and is the primary source of potable water for Greater Harare. The Works comprise three distinct plants, commonly referred to as Plant One, Plant Two and Plant Three. Plant One, constructed in 1953, was a 45 Mld works, treating water abstracted from Lake Chivero through an offshore intake tower, and comprised head works and chemical dosing plant, two 33.5m diameter clarifiers, 12 rapid gravity filers (Paterson), three pumps housed in Pumpstation One, and a 750mm diameter steel pipeline to Warren Control and Lochinvar. Plant One was extended in the late 1950’s, to produce an additional 115Mld through the provision of an Accentrifloc clarifier, 14 additional rapid gravity filters (Degremont type), three pumps (‘Medium Pumps”)housed in Pumpstation Two, and a 1000mm steel pipeline to Warren Control; It is the 45Mld rapid gravity filters and associated building, valves, pipework,etc. commonly referred to as the Paterson Filters that are to be refurbished under this contract. It is assumed that the filters and filter galley buildings are structurally sound, but that the mechanical, electrical and control plant and equipment have exceeded their design life and should be replaced with current state of the art plant and equipment. The building itself also requires refurbishment. The objective of the tender is to return the Morton Jaffray Plant One Paterson Filters; incorporating Filters 1 to 12; to full operational capacity, with automatic control and integration into the operations of Morton Jaffray Works. 3 Proposed Solution The following works need to be undertaken: • Isolate Paterson filter house, and strip filter house of all air scour, electrical, mechanical and pneumatic equipment, including switches, cables, inlet control and flap valves, outlet valves and flow control system; • Supply, install and test : MJDB 003 Paterson Filter Galley | Issue | 19 November 2012 Page 1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ003 PATERSON FILTER REFURBISHMENT ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade o inlet, outlet and flow control valves complete with electrical actuators, and associated pipelines; o air scour system complete with air blower, air pipelines, air valves and electrically powered actuators; o control system with link to control room in filter gallery and duplicate control to Master Control Centre, to show valve positions, water levels in filters, flow into and out of filter beds, clear water reservoir levels, water quality indicators (pH, turbidity), air pressure and flow, backwashing and backwash sequencing; o manual control console per filter; o power supply, including lighting, maintenance power sockets; • Seal cracks and re-screed all water retaining concrete surfaces; • Refurbish structure, including concrete works and making good, replace floor tiles, windows and doors, paint, glaze, interior and exterior of building, seal roof, and replace ceilings. • Provide and install the necessary electrical control panel, instrumentation control, manual override. • Provide power supply, including lighting, maintenance power sockets; • Any other civil, mechanical and electrical works needed to make the Morton Jaffray Plant One Paterson Filters; incorporating Filters 1 to 12; fully functional; • Commission the entire control system, including integration with overall control; • Provide Operations and Training manuals for the Filter operation; • Train the operations staff in the operations and maintenance of the filter galley. Note the philosophy to be adopted is that the existing plant is to be removed and replaced. The replacement plant is to be specified on the basis of whole life cost, reliability, durability and the availability of local capacity for service and repair. The flow control system is an integral part of an operational water treatment works, and numerous cables, pipes and other foreign services have been installed at various stages of the Morton Jaffray Plant life. The Plant is required to continue to operate whilst the replacement operation is in progress, and the Service Provider is to prepare a plan showing how the operation of the works is not compromised by this refurbishment and replacement project. 4 Scope of Investigations, Survey and Design 4.1 Project stages The services required in delivering the assignment are described in stages defined in accordance with the South African Guideline Scope of Services and Tariff of Fees for Registered Persons 2010. The stages are MJDB 003 Paterson Filter Galley | Issue | 19 November 2012 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ003 PATERSON FILTER REFURBISHMENT ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade Stage 1– Inception Establish client requirements and preferences, assess user needs and options, appointment of necessary consultants, and establish the project brief including project objectives, priorities constraints, assumptions, aspirations and strategies. Stage 2 – Concept and Viability (Preliminary Design) Prepare and finalise the project concept in accordance with the brief, including project scope, scale, character, form and function, plus preliminary programme and viability of the project. Stage 3– Design Development (Detailed Design) Develop the approved concept to finalise the design, outline specifications, cost plan, financial viability and programme for the project. Stage 4 – Documentation and Procurement Prepare procurement and construction documentation, confirm and implement the procurement strategies and procedures for effective and timeous procurement of necessary resources for execution of the project. Stage 5 – Contract Administration and Inspection Manage, administer and monitor the construction contracts and processes including preparation and coordination of procedures and documentation to facilitate practical completion of the Works. Stage 6 – Close Out Fulfil and complete the project close-out including necessary documentation to facilitate effective completion, handover and operation of the project. 4.2 Stage 2 – Concept and Viability (Preliminary Design) 4.2.1 Activities Activities covered under Stage 2 would include, but not be limited to:  An assessment of the plant requirements;  An assessment of the building refurbishment requirements;  A detailed preliminary design report;  Outline of the preferred control philosophy and instrumentation required  A bill of quantities for the proposed refurbishment, and specifically showing:  Civil, building and structural works;  Mechanical equipment, valves, piping and interconnection;  Electrical works, power supply, lighting,  Instrumentation and controls;  All specifications; MJDB 003 Paterson Filter Galley | Issue | 19 November 2012 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ003 PATERSON FILTER REFURBISHMENT ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade  Description of the selection of the recommended equipment;  Valve arrangement and piping arrangements;  Building refurbishment schedule;  Other requirements that the Employer may deem necessary for the safe and efficient operation of the Paterson Filters. 4.2.2 Preliminary Phase Acceptance Criteria The preliminary design shall be detailed sufficiently to allow the Contractor to proceed with the procurement, installation, testing and commissioning of all plant, equipment, instrumentation, power and controls, building and structural repairs necessary to restore full operational capacity. 4.3 Stage 3– Design Development (Detailed Design) 4.3.1 Design No detailed design phase is required as the prelimary design shall be of sufficient details as to allow for the refurbishment described in para 4.2.2 above. 4.4 Stage 4 – Documentation and Procurement 4.4.1 General This project shall be tendered on a design and build basis. The Contractor is to clearly identify the elements designed by the Contactor. The total extent of investigations, surveys and design work required will not be reduced, all items identified in section 4 of this Brief must be included either in either the Contractor’s and Client’s scope. 4.4.2 Contents of Tender Documents 4.4.2.1 Form of Contract The form of contract is likely to be determined by the funding agency’s requirements, the amount of design for which the Contractor will be responsible, and by Harare Water. The requirements for the Appendix to the Form of Contract and Special Conditions of Contract are dealt with in general terms of the FIDIC Short Form of Contract in the General Project Brief. 4.4.2.2 Specification The Specification will be based on the relevant sections of the Standard Specification the SAZS and SANS 1200. Any additions and modifications to the requirements of SANS shall be incorporated in the particular Specification and shall be framed in accordance with the requirements of SANS 1200. Additional standards will be in SAZS standards, where available, or British or other MJDB 003 Paterson Filter Galley | Issue | 19 November 2012 Page 4 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ003 PATERSON FILTER REFURBISHMENT ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade internationally recognised standards. The Particular Specification shall define at least the following:  Location and limits of the site;  Security requirements and procedures;  Access to site;  Handover of the site including responsibilities for isolation of services and any diversions required;  Facilities to be provided by the Employer;  Facilities to be provided by the Contractor, including accommodation and facilities for staff and the Employer;  Applicable legislation’ including employees’ protection and environmental protection;  Health and safety requirements;  Contractor’s liabilities, including for pollution incidents;  Contractor’s design responsibilities and liabilities;  Conditions and procedures for Takeover by the Employer. 4.4.2.3 Contractor’s documentation The specification shall define the documentation to be provided by the Contractor. In particular it should specify the format and content of the required documents that should include:  Requirements for the tender programme specifying format, milestones etc.;  Risk assessments and method statements for particular activities;  A detailed commissioning plan;  Scale and accuracy for ‘as built’ and design drawings;  Items of work for which calculations are required;  Construction completion report;  Operations and maintenance manuals; and  Inputs to a health and safety file for the project including details of suppliers and particular risks associated with the operation, maintenance and decommissioning of the works. 4.5 Stage 5 – Contract Administration and Inspection The Contractor shall provide suitably qualified and experienced staff to supervise construction. 4.6 Acceptance testing Requirements for acceptance testing for valves and other equipment shall be specified including: MJDB 003 Paterson Filter Galley | Issue | 19 November 2012 Page 5 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ003 PATERSON FILTER REFURBISHMENT ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade  Requirements for witnessing of tests  Grade of acceptance testing required for electrical and mechanical equipment  Responsibility for costs of testing and witnessing. 4.7 Other testing and commissioning Particular attention should be paid to defining the type, frequency and required standards for testing. The requirements for Commissioning shall be detailed in the Preliminary Design phase, and shall include responsibility for supply of equipment, responsibility for costs of consumables for initial testing and re-testing where necessary. Following commissioning of the whole of the works, but before takeover by the employer, a reliability test shall be carried out, during which the works shall be operated by the Contractor and the performance and all failures and interventions required to ensure proper operation of automated systems shall be recorded. If any process critical equipment or controls fail during the period, the Contractor shall repair the fault and restart the test. Where equipment is configured in a duty/standby arrangement, the failure of duty item of equipment shall not be classed as a failure provided the standby unit takes over and operates correctly for the remainder of the reliability test period. 4.8 Stage 6 – Close Out 4.8.1.1 Contractor’s documentation The Contractor shall deliver the following documentation in addition to the tender documentation issued at Stage 4: All background information collected and results of surveys and investigations conducted; A health and safety file including the basis of design, particular risks associated with the operation, maintenance and decommissioning of the works and contact details for all parties involved. MJDB 003 Paterson Filter Galley | Issue | 19 November 2012 Page 6 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ003 PATERSON FILTER REFURBISHMENT ISSUE.DOCX Appendix E Design Brief MJ004 Medium Pump Sump Design City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design MJDB 004 Issue | 19 November 2012 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191-00 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd Arup (Pty) Ltd Postnet Suite No.93 Private Bag X1 Melrose Arch Johannesburg 2076 South Africa www.arup.com Document Verification Job title 1031794 – Technical Assistance for Water and Job number Wastewater Treatment Works in the City of Harare 219191-00 Document title Draft Project Brief – Morton Jaffray Water File reference Treatment Works Refurbishment Design Document ref MJDB 004 Revision Date Filename MJ Design Brief MJ004.docx Draft 1 18/10/20 Description First draft 12 Prepared by Checked by Approved by Name Andy Robertshaw Jeff Broome Mark Tindale Signature Draft 1 10 Oct Design Brief MJ004 medium pump sump rev 2.docx 2012 Signature Issue 19 Nov Filename Design Brief MJ004 medium pump sump issue.docx 2012 Description Prepared by Checked by Approved by Name Signature Filename Description Prepared by Checked by Approved by Name Signature Issue Document Verification with Document  MJDB 004 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ004 MEDIUM PUMP SUMP DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design Contents Page 1 Background 1 2 Pump House Two 1 3 Scope of Work 2 4 Scope of Investigations, Survey and Design 3 4.1 Project stages 3 4.2 Required project services 4 5 Required Experience 4 5.1 Tenderer’s Experience 4 5.2 Experience of key personnel 4 MJDB 004 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ004 MEDIUM PUMP SUMP DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design 1 Background Harare Water, a semi-autonomous entity within the City of Harare, has obtained funding to implement the refurbishment programme at the Morton Jaffray Works. Morton Jaffray is the City of Harare’s primary potable water source, and has been developed in four stages, being:  Plant One, constructed in 1953, was a 45 Mld works, three (“Small Pumps”) pumps housed in Pumpstation One, and a 750mm diameter steel pipeline to Warren Control and Lochinvar;  Plant One was extended in the late 1950’s, by 115Mld, three pumps(‘Medium Pumps”) housed in Pump House Two, and a 1000mm steel pipeline to Warren Control;  Plant Two, a 227 Mld works constructed 1976 included an extension to Pumpstation Two to accommodate four pumps (“Large Pumps”), and a 1300mm steel pipeline to Warren Control;  Plant Three, a 227 Mld works constructed 1994 also included an extension to Pump House Two for additional “Large Pumps”. The Medium Pumps, located in Pump House Two, suffer from continual cavitation and this project is to identify and design a solution to the cavitation. Note : The Procurement of goods and services for Harare Water is conducted through the Zimbabwe State Procurement Board. 2 Pump House Two The Medium Pumps are susceptible to cavitation, and it is suspected that the cause of the cavitation is a restricted suction. The current layout of the suction piping is complex. The Medium Pumps were designed pump duty of 2630m3/hr. singly, or 4792m3/hr. in parallel, against a head of 145m. They were installed as part of the first upgrade of Plant One from 45Mld to 160Mld. The original pump layout was designed to allow the Medium Pumps to pump either through a dedicated 975mm rising main to Warren Control, or through interconnecting pipework to the original750mm Lochinvar rising main. Note that the 975mm interconnecting valve is defective. The design of Plant Two provided a connection from the Plant Two pump sump to the Medium Pumps suction manifold. In the event that sufficient potable water was not produced by Plant One, the Medium Pumps could obtain water from the Plant Two suction duct. The maximum available head is the full supply level of water in the Plant Two duct, which is only 2 m above the Medium Pumps centre line. The flow to this duct was further constrained by the extension of the pump house to house the Plant Three pumps. Cavitation of the medium pumps is a major concern and much of the medium pump down time is attributed to cavitation induced problems. The cavitation MJDB 004 | Issue | 19 November 2012 Page 1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ004 MEDIUM PUMP SUMP DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design problem has resulted in considerable damage to the Medium Pump pump sets, and to the connecting pipework. Repeated welding repairs of Pump Four’s deliver side reducer have rendered the metal very brittle and the reducer should be replaced, however, unless the cause of the cavitation is addressed, repeated failure is likely. It is proposed that, in order to overcome the cavitation constraints, a new and separate medium pump sump be constructed. 3 Scope of Work This appointment is for the engineering design: together with recommendations for design development, construction procurement, inspection and project close out; needed to provide an overall integrated design for a new pump sump for Pump House Two. The design will require the services of a number of specialists with experience in the design of water treatment works and covering the following fields of expertise:  Structural engineering;  Hydraulic design of pipe networks;  Electrical engineering;  Mechanical engineering;  Process control;  Process engineering;  Structural engineering. The overall scope will include:  Inception Phase of study o Obtain all records and information on the works; o Review the drawings showing the design of the suction side of the water supply networks from Plant One, Plant Two and Plant Three and prepare an schematic, showing existing infrastructure, suction and delivery piping supplying the Medium Pumps; o Prepare concept design report detailing project objectives, constraints, assumptions, and propose recommendations leading to the Concept and Viability (Preliminary Design) stage ;  Prepare the Concept and Viability report study on the design of the new Medium Pumps sump.  In the event that a sump is not the correct solution an alternative system should be sought and recommendations provided.  Once an acceptable solution is determined and agreed, the preliminary design of the solution be undertaken that will include: o Overall process; o Integrated control system for all parts of the works, including overall control at a Master Control Centre, but allowing local control of each unit process; o Mechanical design, piping and rotating equipment (size all major equipment) needed; MJDB 004 | Issue | 19 November 2012 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ004 MEDIUM PUMP SUMP DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design o Piping, valves o Civil and structural engineering to support the installation of above plant and equipment.  Preparation of budget prices for the solution;  Propose procurement method(i.e. design and constructed, turnkey, etc.) and include reasons for recommended method; and following acceptance by Harare Water proceed with procurement;  Draft tender documentation for the Design development, Construction, Contract administration and Inspection, commissioning and Close Out of the works; using as a recommended standard, the following standard form of contract; o FIDIC Conditions of Contract for Electrical and Mechanical Works including Erection on Site (Yellow Book) Third Edition 1987 contract; o FIDIC Conditions of Contract for Works of Civil, Engineering Construction (Red Book), Fourth Edition 1987 (as updated) contract o General Conditions of Contract (1984); 4 Scope of Investigations, Survey and Design 4.1 Project stages The services required in delivering the assignment are described in stages defined in accordance with the South African Guideline Scope of Services and Tariff of Fees for Registered Persons.  Stage One– Inception. Establish client requirements and preferences assess user needs and options, appointment of necessary consultants, and establish the project brief including project objectives, priorities constraints, assumptions, aspirations and strategies.  Stage Two – Concept and Viability (Preliminary Design). Prepare and finalise the project concept in accordance with the brief, including project scope, scale, character, form and function, plus preliminary programme and viability of the project.  Stage Three– Design Development (Detailed Design). Develop the approved concept to finalise the design, outline specifications, cost plan, financial viability and programme for the project.  Stage Four – Documentation and Procurement. Prepare procurement and construction documentation, confirm and implement the procurement strategies and procedures for effective and timeous procurement of necessary resources for execution of the project.  Stage Five – Contract Administration and Inspection. Manage, administer and monitor the construction contracts and processes including preparation and coordination of procedures and documentation to facilitate practical completion of the Works. MJDB 004 | Issue | 19 November 2012 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ004 MEDIUM PUMP SUMP DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design  Stage Six – Close Out Fulfil and complete the project close-out including necessary documentation to facilitate effective completion, handover and operation of the project. 4.2 Required project services This appointment will require the services of a Contractor to undertake all stages of the engineering design (Inception, Concept and Viability, Design Development Documentation and Procurement, Construction Administration and Inspection, and Close Out. 5 Required Experience 5.1 Tenderer’s Experience The experience of the Contractor will be evaluated on the basis of their experience in undertaking similar projects, either in Zimbabwe, or in SADC countries. The Tenderer is to show, with reference to his recent experience, that he is able to undertake such a project under Zimbabwean conditions. The evaluation will review the track record provided with regard to:  Management of similar programmes within the last ten years;  Practicality and successful completion of such projects to the client’s satisfaction;  Incorporation of state of the art equipment and systems;  Submission of a sufficiently well described preliminary design report, with recommendations. The description should be in tabular form with the following headings. Employer, contact Description of the Value of work Date completed person and contact works and specific provided details for both services provided person and client The scoring of the experience will be as follows. Poor No equivalent or verifiable experience, Satisfactory Five or less equivalent and verifiable projects Good Five to ten equivalent and verifiable projects Very Good More than ten equivalent and verifiable projects 5.2 Experience of key personnel The tenderer will be required to show, for the following key personnel, their skills, qualifications, and experiences. MJDB 004 | Issue | 19 November 2012 Page 4 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ004 MEDIUM PUMP SUMP DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design 5.2.1 Project Manager Registered with the ECZ and ten years’ experience with managing similar projects 5.2.2 Civil/Structural Design Engineer Registered with ECZ, and five years similar experience, degree or diploma qualified, Member of ZIE. 5.2.3 Electrical Design Engineer Registered with ECZ, and five years similar experience, degree or diploma qualified, member of ZIE. 5.2.4 Mechanical Design Engineer Registered with ECZ, and five years similar experience, degree or diploma qualified, member of ZIE. 5.2.5 Particulars The description should be in tabular form with the following headings: Name and date of birth Nationality Tertiary Qualification (degree/diploma, institution, date obtained) Current Employer, position and length of employment Outline of last ten years of experience, organisation, year, position, project, outline of assignment (showing bearing on this assignment) Score General experience Adequacy for Knowledge of assignment issues pertinent to project Poor (0 – 40) None or limited(<5 None or limited None or limited years) relevant pertinent experience(<2 knowledge(<2 years) years) Reasonable(>5years) Reasonable Reasonable Satisfactory(41- relevant pertinent 70) experience(2-5 knowledge (2-5 years) years) Extensive(>10years) Extensive Extensive Good (71-90) relevant pertinent experience(>5 knowledge(>5 years) years) MJDB 004 | Issue | 19 November 2012 Page 5 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ004 MEDIUM PUMP SUMP DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design Extensive(>20 Extensive Extensive Very Good(90+) years) relevant pertinent experience(>10 knowledge(>10 years) years) MJDB 004 | Issue | 19 November 2012 Page 6 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ004 MEDIUM PUMP SUMP DESIGN ISSUE.DOCX Appendix F Design Brief MJ005 Medium Pumps City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design MJDB 005 Issue | 19 November 2012 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191-00 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd Arup (Pty) Ltd Postnet Suite No.93 Private Bag X1 Melrose Arch Johannesburg 2076 South Africa www.arup.com Document Verification Job title 1031794 – Technical Assistance for Water and Job number Wastewater Treatment Works in the City of Harare 219191-00 Document title Draft Project Brief – Morton Jaffray Water File reference Treatment Works Refurbishment Design Document ref MJDB 005 Revision Date Filename Design Brief MJ005.docx Draft 1 18/8/201 Description First draft 2 Prepared by Checked by Approved by Name Andy Robertshaw Jeff Broome Mark Tindale Signature Draft 2 10/10/ Design Brief MJ005 Medium Pump rev 2.docx 2012 Signature Issue 19 Nov Filename Design Brief MJ005 medium pumps issue.docx 2012 Description Prepared by Checked by Approved by Name Signature Filename Description Prepared by Checked by Approved by Name Signature Issue Document Verification with Document  MJDB 005 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ005 MEDIUM PUMPS ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design Contents Page 1 Background 1 2 Medium Pumps and Pump House Two 1 3 Scope of Work 2 4 Scope of Investigations, Survey and Design 3 4.1 Project stages 3 4.2 Required project services 3 5 Required Experience 4 5.1 Tenderer’s Experience 4 5.2 Experience of key personnel 4 MJDB 005 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ005 MEDIUM PUMPS ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design 1 Background Harare Water, a semi-autonomous entity within the City of Harare, has obtained funding to implement the refurbishment programme at the Morton Jaffray Works. Morton Jaffray is the City of Harare’s primary potable water source, and has been developed in four stages, being:  Plant One, constructed in 1953, was a 45 Mld works, three (“Small Pumps”) pumps housed in Pumpstation One, and a 750mm diameter steel pipeline to Warren Control and Lochinvar;  Plant One was extended in the late 1950’s, by 115Mld, three pumps(‘Medium Pumps”) housed in Pump House Two, and a 1000mm steel pipeline to Warren Control;  Plant Two, a 227 Mld works constructed 1976 included an extension to Pumpstation Two to accommodate four pumps (“Large Pumps”), and a 1300mm steel pipeline to Warren Control;  Plant Three, a 227 Mld works constructed 1994 also included an extension to Pump House Two for additional “Large Pumps”. The Medium Pumps, located in Pump House Two, have suffered from continual cavitation. A concurrent project to identify and design a solution to the cavitation is being undertaken. This project is to design the mechanical rotating equipment and associated, valves, controls, manifold and interconnection pipework needed to support that solution. Note : The Procurement of goods and services for Harare Water is conducted through the Zimbabwe State Procurement Board. 2 Medium Pumps and Pump House Two The Medium Pumps are susceptible to cavitation, and it is suspected that the cause of the cavitation is a restricted suction. The current layout of the suction piping is complex. The Medium Pumps; with a designed pump duty of:  2630m3/hr. singly, or 4792m3/hr. in parallel, against a head of 145m; were installed as part of the first upgrade of Plant One from 45Mld to 160Mld. The original pump layout was designed to allow the Medium Pumps to pump either through a dedicated 975mm rising main to Warren Control, or through interconnecting pipework to the original 750mm Lochinvar rising main. Note that the 975mm interconnecting valve is defective. The design of Plant Two provided a connection from the Plant Two pump sump to the Medium Pumps suction manifold. In the event that sufficient potable water was not produced by Plant One, the Medium Pumps could obtain water from the Plant Two suction duct. The maximum available head is the full supply level of water in the Plant Two duct, which is only 2 m above the Medium Pumps centre MJDB 005 | Issue | 19 November 2012 Page 1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ005 MEDIUM PUMPS ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design line. The flow to this duct was further constrained by the extension of the pump house to house the Plant Three pumps. Cavitation of the Medium Pumps is a major concern and much of the medium pump down time is attributed to cavitation induced problems. The cavitation problem has resulted in considerable damage to the Medium Pump pump sets, and to the connecting pipework. Repeated welding repairs of Pump Four’s deliver side reducer have rendered the metal very brittle and the reducer should be replaced. However, unless the cause of the cavitation is addressed, repeated failure is likely. 3 Scope of Work This appointment is for the engineering design: together with recommendations for design development, construction procurement, inspection and project close out; needed to provide the necessary new rotating equipment (pumps). The design will require the co-ordination with the services of a number of specialists with experience in the design of water treatment works and covering the following fields of expertise:  Mechanical and closed conduit hydraulic engineering;  Instrumentation and control; The overall scope will include:  Inception Phase of study o Obtain all records and information on the works; o Review the drawings showing the design of the suction side of the water supply networks from Plant One, Plant Two and Plant Three and prepare an schematic, showing existing infrastructure, suction and delivery piping supplying the Medium Pumps; o Prepare concept design report detailing project objectives, constraints, assumptions, and propose recommendations leading to the Concept and Viability (Preliminary Design) stage ;  Prepare the Concept and Viability report study on the design of the new Medium Pumps.  the preliminary design of the solution be undertaken that will include: o Mechanical design, piping and rotating equipment (size all major equipment) needed; o Piping, valves o Civil and structural engineering to support the installation of above plant and equipment.  Preparation of budget prices for the solution;  Proposed procurement method(i.e. design and constructed, turnkey, etc.) and include reasons for recommended method; and following acceptance by Harare Water proceed with procurement;  Draft tender documentation for the Design development, Construction, Contract Administration and Inspection, Commissioning and Close Out of MJDB 005 | Issue | 19 November 2012 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ005 MEDIUM PUMPS ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design the works; using as a recommended standard, the following standard form of contract; o FIDIC Conditions of Contract for Electrical and Mechanical Works including Erection on Site (Yellow Book) Third Edition 1987 contract; o FIDIC Conditions of Contract for Works of Civil, Engineering Construction (Red Book), Fourth Edition 1987 (as updated) contract o General Conditions of Contract (1984); 4 Scope of Investigations, Survey and Design 4.1 Project stages The services required in delivering the assignment are described in stages defined in accordance with the South African Guideline Scope of Services and Tariff of Fees for Registered Persons.  Stage One– Inception. Establish client requirements and preferences assess user needs and options, appointment of necessary consultants, and establish the project brief including project objectives, priorities constraints, assumptions, aspirations and strategies.  Stage Two – Concept and Viability (Preliminary Design). Prepare and finalise the project concept in accordance with the brief, including project scope, scale, character, form and function, plus preliminary programme and viability of the project.  Stage Three– Design Development (Detailed Design). Develop the approved concept to finalise the design, outline specifications, cost plan, financial viability and programme for the project.  Stage Four – Documentation and Procurement. Prepare procurement and construction documentation, confirm and implement the procurement strategies and procedures for effective and timeous procurement of necessary resources for execution of the project.  Stage Five – Contract Administration and Inspection. Manage, administer and monitor the construction contracts and processes including preparation and coordination of procedures and documentation to facilitate practical completion of the Works.  Stage Six – Close Out Fulfil and complete the project close-out including necessary documentation to facilitate effective completion, handover and operation of the project. 4.2 Required project services This appointment will require the services of a Contractor to undertake all stages of the engineering design (Inception, Concept and Viability, Design Development Documentation and Procurement, Construction Administration and Inspection, and Close Out. MJDB 005 | Issue | 19 November 2012 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ005 MEDIUM PUMPS ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design 5 Required Experience 5.1 Tenderer’s Experience The experience of the Contractor will be evaluated on the basis of their experience in undertaking similar projects, either in Zimbabwe, or in SADC countries. The Tenderer is to show, with reference to his recent experience, that he is able to undertake such a project under Zimbabwean conditions. The evaluation will review the track record provided with regard to:  Design and management of similar programmes within the last ten years;  Practicality and successful completion of such projects to the client’s satisfaction;  Incorporation of state of the art equipment and systems;  Submission of a sufficiently well described preliminary design report, with recommendations. The description should be in tabular form with the following headings. Employer, contact Description of the Value of work Date completed person and contact works and specific provided details for both services provided person and client The scoring of the experience will be as follows. Poor No equivalent or verifiable experience, Satisfactory Five or less equivalent and verifiable projects Good Five to ten equivalent and verifiable projects Very Good More than ten equivalent and verifiable projects 5.2 Experience of key personnel The tenderer will be required to show, for the following key personnel, their skills, qualifications, and experiences. 5.2.1 Project Manager Registered with the ECZ and ten years’ experience with managing similar projects 5.2.2 Civil/Structural Design Engineer Registered with ECZ, and five years similar experience, degree or diploma qualified, Member of ZIE. MJDB 005 | Issue | 19 November 2012 Page 4 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ005 MEDIUM PUMPS ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design 5.2.3 Electrical Design Engineer Registered with ECZ, and five years similar experience, degree or diploma qualified, member of ZIE. 5.2.4 Mechanical Design Engineer Registered with ECZ, and five years similar experience, degree or diploma qualified, member of ZIE. 5.2.5 Particulars The description should be in tabular form with the following headings: Name and date of birth Nationality Tertiary Qualification (degree/diploma, institution, date obtained) Current Employer, position and length of employment Outline of last ten years of experience, organisation, year, position, project, outline of assignment (showing bearing on this assignment) Score General experience Adequacy for Knowledge of assignment issues pertinent to project Poor (0 – 40) None or limited(<5 None or limited None or limited years) relevant pertinent experience(<2 knowledge(<2 years) years) Reasonable(>5years) Reasonable Reasonable Satisfactory(41- relevant pertinent 70) experience(2-5 knowledge (2-5 years) years) Extensive(>10years) Extensive Extensive Good (71-90) relevant pertinent experience(>5 knowledge(>5 years) years) Extensive(>20 Extensive Extensive Very Good(90+) years) relevant pertinent experience(>10 knowledge(>10 years) years) MJDB 005 | Issue | 19 November 2012 Page 5 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ005 MEDIUM PUMPS ISSUE.DOCX Appendix G Design Brief MJ006 Clarifier Eight Inclined Plate Settler City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade MJDB 006 Inclined plate settler, Clarifier Eight Issue | 19 November 2012 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191-00 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd Arup (Pty) Ltd Postnet Suite No.93 Private Bag X1 Melrose Arch Johannesburg 2076 South Africa www.arup.com Document Verification Job title 1031794 – Technical Assistance for Water and Job number Wastewater Treatment Works in the City of Harare 219191-00 Document title Draft Project Brief – Morton Jaffray Water File reference Treatment Works Upgrade Document ref MJDB 006 Inclined plate settler, Clarifier Eight Revision Date Filename Design Brief MJ006.docx Draft 1 23 Jul Description First draft 2012 Prepared by Checked by Approved by Name Jeff Broome Andy Robertshaw Andy Robertshaw Signature Draft 2 4 Filename Design Brief MJ006 Paterson Filters draft two.docx October Description Installation of Inclined Plate Settler Morton Jaffray Plant Two 2012 Clarifier Eight Prepared by Checked by Approved by Name Signature Issue 19 Nov Design Brief MJ006 Clarifier Eight Inclined Plate Settler draft Filename 2012 issue.docx Description Prepared by Checked by Approved by Name Signature Filename Description Prepared by Checked by Approved by Name Signature Issue Document Verification with Document  MJDB 006 Inclined plate settler, Clarifier Eight | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ006 CLARIFIER EIGHT INCLINED PLATE SETTLER ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade Contents Page 1 Background 1 2 Project Rationale and Objectives 1 3 Proposed Solution 1 4 Scope of Investigations, Survey and Design 2 4.1 Project stages 2 4.2 Stage 2 – Concept and Viability (Preliminary Design) 3 4.3 Stage 3– Design Development (Detailed Design) 4 4.4 Stage 4 – Documentation and Procurement 4 4.5 Stage 5 – Contract Administration and Inspection 5 4.6 Acceptance testing 5 4.7 Other testing and commissioning 5 4.8 Stage 6 – Close Out 6 MJDB 006 Inclined plate settler, Clarifier Eight | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ006 CLARIFIER EIGHT INCLINED PLATE SETTLER ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade 1 Background Harare Water, a semi-autonomous entity within the City of Harare, has obtained funding to implement the refurbishment programme at the Morton Jaffray Works. This Tender notice is for the appointment of a Contractor for design, supply, and installation and commissioning of an inclined plate settler (“lamella settler”), and the replacement of portions of the inlet flow distribution system into Clarifier Eight, an existing Degremont type Pulsator Clarifier. Note : The Procurement of goods and services for Harare Water is conducted through the Zimbabwe State Procurement Board. 2 Project Rationale and Objectives The Morton Jaffray (MJ) Water Treatment Works, with a design capacity of 614Mld, is located below Lake Chivero, outside Harare and is the primary source of potable water for Greater Harare. The Works comprise three distinct plants, commonly referred to as Plant One, Plant Two and Plant Three. Plant Two, a 227 Mld works constructed 1976 comprised a new mixing chamber, chemical dosing and storage, three clarifiers, 18 double filters and a clear water well, an extension to Pumpstation Two to accommodate four pumps, and a 1300mm steel pipeline to Warren Control. The Plant Two clarifiers are Pulsator clarifier types. Flocculated water enters at the base of the clarifier, and is distributed through 450mm OD perforated fibre cement distribution pipes. Several of these are cracked and should be replaced. To more evenly distribute the water, fibre cement baffles, configured in a triangular “tent” shape are place above the distribution pipes. Many of these are broken and should all be replaced, using water works standard material. Production improvement would be possible with the retro fitting of proprietary inclined plate settlers (lamella type) in the upper portions of the clarifiers. It is estimated that the lamellas could provide up to a 50% improvement in production, or a 42Ml/d increase, as the lamellas allow for high settlement rates and assist in the production of more dense sludge. Coupled to this improvement will be a requirement for increased downstream filtration capacity. The objective of the tender is to increase the through put of the existing Morton Jaffray Plant Two Pulsator Clarifier, Clarifier Eight, by at least 50%. 3 Proposed Solution The following works need to be undertaken: • Empty and inspect Clarifier Eight; • Obtain as built drawings and confirm all dimensions of Clarifier Eight; • Identify all broken 450mm diameter perforated FC distribution pipes, procure new and install; MJDB 006 Inclined plate settler, Clarifier Eight | Issue | 19 November 2012 Page 1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ006 CLARIFIER EIGHT INCLINED PLATE SETTLER ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade • Procure sufficient replacement triangular “Tent” baffles fabricated from a water works standard material, to cover all inflow distribution pipes; • Design, procure, and customise to suit Clarifier Eight, sufficient proprietary inclined plate settlers to allow for a minimum of 50% increase in clarification rate; • Procure and install a new complete proprietary pulsator to ensure full operation of the pulsation action • Provide and install any necessary electrical control panel, instrumentation control, manual override. • Any other civil, mechanical and electrical works needed to make the Morton Jaffray Plant Two Clarifier fully functional; • Commission the settling system, including integration with overall control; • Provide Operations and Training manuals for the inclined plate systems; • Train the operations staff in the operations and maintenance of the inclined plate system. The plant is to be specified on the basis of whole life cost, reliability, durability and the availability of local capacity for service and repair. The Plant is required to continue to operate whilst the installation of the equipment is undertaken, and the Contractor is to prepare a plan showing how the operation of the works is not compromised by this refurbishment and replacement project. 4 Scope of Investigations, Survey and Design 4.1 Project stages The services required in delivering the assignment are described in stages defined in accordance with the South African Guideline Scope of Services and Tariff of Fees for Registered Persons 2010. The stages are Stage 1– Inception Establish client requirements and preferences assess user needs and options, appointment of necessary consultants, and establish the project brief including project objectives, priorities constraints, assumptions, aspirations and strategies. Stage 2 – Concept and Viability (Preliminary Design) Prepare and finalise the project concept in accordance with the brief, including project scope, scale, character, form and function, plus preliminary programme and viability of the project. Stage 3– Design Development (Detailed Design) Develop the approved concept to finalise the design, outline specifications, cost plan, financial viability and programme for the project. Stage 4 – Documentation and Procurement MJDB 006 Inclined plate settler, Clarifier Eight | Issue | 19 November 2012 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ006 CLARIFIER EIGHT INCLINED PLATE SETTLER ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade Prepare procurement and construction documentation, confirm and implement the procurement strategies and procedures for effective and timeous procurement of necessary resources for execution of the project. Stage 5 – Contract Administration and Inspection Manage, administer and monitor the construction contracts and processes including preparation and coordination of procedures and documentation to facilitate practical completion of the Works. Stage 6 – Close Out Fulfil and complete the project close-out including necessary documentation to facilitate effective completion, handover and operation of the project. 4.2 Stage 2 – Concept and Viability (Preliminary Design) 4.2.1 Activities Activities covered under Stage 2 would include, but not be limited to:  An assessment of the plant requirements;  An assessment of the building refurbishment requirements;  A detailed preliminary design report;  Outline of the preferred control philosophy and instrumentation required  A bill of quantities for the installation, and specifically showing any :  Civil, building and structural works needed;  Mechanical equipment, valves, piping and interconnection;  Electrical works, power supply, lighting,  Instrumentation and controls;  All specifications;  Description of the selection of the recommended equipment;  Valve arrangement and piping arrangements;  Building refurbishment schedule;  Other requirements that the Employer may deem necessary for the safe and efficient operation of the inclined plate settler, and inflow distribution system. 4.2.2 Preliminary Phase Acceptance Criteria The preliminary design shall be detailed sufficiently to allow the Contractor to proceed with the procurement, installation, testing and commissioning of all plant, equipment, instrumentation, power and controls, building and structural repairs necessary to restore full operational capacity. MJDB 006 Inclined plate settler, Clarifier Eight | Issue | 19 November 2012 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ006 CLARIFIER EIGHT INCLINED PLATE SETTLER ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade 4.3 Stage 3– Design Development (Detailed Design) 4.3.1 Design No detailed design phase is required as the preliminary design shall be of sufficient details as to allow for the refurbishment described in Para 4.2.2 above. 4.4 Stage 4 – Documentation and Procurement 4.4.1 General This project shall be tendered on a design and build basis. The Contractor is to clearly identify the elements designed by the Contactor. The total extent of investigations, surveys and design work required will not be reduced, all items identified in section 4 of this Brief must be included either in either the Contractor’s and Client’s scope. 4.4.2 Contents of Tender Documents 4.4.2.1 Form of Contract The form of contract is likely to be determined by the funding agency’s requirements, the amount of design for which the Contractor will be responsible, and by Harare Water. The requirements for the Appendix to the Form of Contract and Special Conditions of Contract are dealt with in general terms of the FIDIC Short Form of Contract in the General Project Brief. 4.4.2.2 Specification The Specification will be based on the relevant sections of the Standard Specification the SAZS and SANS 1200. Any additions and modifications to the requirements of SANS shall be incorporated in the particular Specification and shall be framed in accordance with the requirements of SANS 1200. Additional standards will be in SAZS standards, where available, or British or other internationally recognised standards. The Particular Specification shall define at least the following:  Location and limits of the site;  Security requirements and procedures;  Access to site;  Handover of the site including responsibilities for isolation of services and any diversions required;  Facilities to be provided by the Employer;  Facilities to be provided by the Contractor, including accommodation and facilities for staff and the Employer;  Applicable legislation’ including employees’ protection and environmental protection;  Health and safety requirements; MJDB 006 Inclined plate settler, Clarifier Eight | Issue | 19 November 2012 Page 4 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ006 CLARIFIER EIGHT INCLINED PLATE SETTLER ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade  Contractor’s liabilities, including for pollution incidents;  Contractor’s design responsibilities and liabilities;  Conditions and procedures for Takeover by the Employer. 4.4.2.3 Contractor’s documentation The specification shall define the documentation to be provided by the Contractor. In particular it should specify the format and content of the required documents that should include:  Requirements for the tender programme specifying format, milestones etc.;  Risk assessments and method statements for particular activities;  A detailed commissioning plan;  Scale and accuracy for ‘as built’ and design drawings;  Items of work for which calculations are required;  Construction completion report;  Operations and maintenance manuals; and  Inputs to a health and safety file for the project including details of suppliers and particular risks associated with the operation, maintenance and decommissioning of the works. 4.5 Stage 5 – Contract Administration and Inspection The Contractor shall provide suitably qualified and experienced staff to supervise construction. 4.6 Acceptance testing Requirements for acceptance testing for valves and other equipment shall be specified including:  Requirements for witnessing of tests  Grade of acceptance testing required for electrical and mechanical equipment  Responsibility for costs of testing and witnessing. 4.7 Other testing and commissioning Particular attention should be paid to defining the type, frequency and required standards for testing. The requirements for Commissioning shall be detailed in the Preliminary Design phase, and shall include responsibility for supply of equipment, responsibility for costs of consumables for initial testing and re-testing where necessary. Following commissioning of the whole of the works, but before takeover by the employer, a reliability test shall be carried out, during which the works shall be operated by the Contractor and the performance and all failures and interventions required to ensure proper operation of automated systems shall be recorded. If any process MJDB 006 Inclined plate settler, Clarifier Eight | Issue | 19 November 2012 Page 5 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ006 CLARIFIER EIGHT INCLINED PLATE SETTLER ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Upgrade critical equipment or controls fail during the period, the Contractor shall repair the fault and restart the test. Where equipment is configured in a duty/standby arrangement, the failure of duty item of equipment shall not be classed as a failure provided the standby unit takes over and operates correctly for the remainder of the reliability test period. 4.8 Stage 6 – Close Out 4.8.1.1 Contractor’s documentation The Contractor shall deliver the following documentation in addition to the tender documentation issued at Stage 4: All background information collected and results of surveys and investigations conducted; A health and safety file including the basis of design, particular risks associated with the operation, maintenance and decommissioning of the works and contact details for all parties involved. MJDB 006 Inclined plate settler, Clarifier Eight | Issue | 19 November 2012 Page 6 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ006 CLARIFIER EIGHT INCLINED PLATE SETTLER ISSUE.DOCX Appendix H Design Brief MJ007 Plant Two Filter Galley City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design MJDB 007 Issue | 19 November 2012 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191-00 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd Arup (Pty) Ltd Postnet Suite No.93 Private Bag X1 Melrose Arch Johannesburg 2076 South Africa www.arup.com Document Verification Job title 1031794 – Technical Assistance for Water and Job number Wastewater Treatment Works in the City of Harare 219191-00 Document title Draft Project Brief – Morton Jaffray Water File reference Treatment Works Refurbishment Design Document ref MJDB 007 Revision Date Filename Design Brief MJ007.docx Draft 1 17/9/201 Description First draft 2 Prepared by Checked by Approved by Name Andy Robertshaw Jeff Broome Mark Tindale Signature Draft 2 10 Oct Design Brief MJ007 Filter galley rev 2.docx 2012 Signature Issue 19 Nov Filename Design Brief MJ007 Plant Two filter Galley issue.docx 2012 Description Prepared by Checked by Approved by Name AM Robertshaw J Broome Signature Filename Description Prepared by Checked by Approved by Name Signature Issue Document Verification with Document  MJDB 007 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ007 PLANT TWO FILTER GALLEY ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design Contents Page 1 Background 1 2 Scope of Work 1 3 Scope of Investigations 2 3.1 Project stages 2 3.2 Required project services 3 4 Required Experience 3 4.1 Tenderer’s Experience 3 4.2 Experience of key personnel 4 MJDB 007 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ007 PLANT TWO FILTER GALLEY ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design 1 Background Harare Water, a semi-autonomous entity within the City of Harare, has obtained funding to implement the refurbishment programme at the Morton Jaffray Works. The Morton Jaffray (MJ) Water Treatment Works, with a design capacity of 614Mld, is located below Lake Chivero, outside Harare and is the primary source of potable water for Greater Harare. The Works comprise three distinct plants, commonly referred to as Plant One, Plant Two and Plant Three, being: • Plant One, constructed in 1953, was a 45 Mld works; • Plant One was extended in the late 1950’s, by 115Mld; • Plant Two, a 227 Mld works constructed 1976; • Plant Three, a 227 Mld works constructed 1994. Plant Two comprised a new mixing chamber, chemical dosing and storage, three clarifiers, 18 double filters and a clear water well, an extension to Pumpstation Two to accommodate four pumps, and a 1300mm steel pipeline to Warren Control. Clarifier Eight’s production rate is to be improved through the retro fitting of proprietary inclined plate settlers (lamella type) in the upper portions of the clarifier. It is estimated that the lamellas could provide up to a 50% improvement in production, or a 42Ml/d increase, as the lamellas allow for high settlement rates and assist in the production of more dense sludge. Coupled to this improvement will be a requirement for increased downstream filtration capacity. The objective of the tender is to provide an additional filtration capacity to match the increased supply of clarified water from Clarifier Eight. Note : The Procurement of goods and services for Harare Water is conducted through the Zimbabwe State Procurement Board. 2 Scope of Work This appointment is for the engineering design; together with recommendations for design development, construction procurement, inspection and project close out; needed to provide the necessary new filtration capacity using rapid gravity filters. The site is such that a new filter works could be installed alongside the Plant Two Filter galley, and it will be necessary to locate the galley such that the filtrate will be able to flow under gravity to Pump House Two. The design will require the co- ordination with the Clients design and operational staff, and the services of a number of specialists with experience in the design of water treatment works particularly the design of filter house The overall scope will include: MJDB 007 | Issue | 19 November 2012 Page 1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ007 PLANT TWO FILTER GALLEY ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design  Inception Phase of study o Obtain all records and information on the works; o Review the drawings showing the design of Plant One, Plant Two and Plant Three and prepare an schematic, showing all existing infrastructure; o Prepare concept design report detailing project objectives, constraints, assumptions, and propose recommendations leading to the Concept and Viability (Preliminary Design) stage ;  Prepare the Concept and Viability report study on the design of the new Filter Galley.  The preliminary design of the Filters will include: o Site selection; civil and structural engineering o Mechanical design of pumps, piping, air scour system complete with air compressors, valves with recommendations for actuator control (size all major equipment); o Piping, valves o Civil and structural engineering to support the installation of above plant and equipment.  Preparation of budget prices for the solution;  Proposed procurement method(i.e. design and constructed, turnkey, etc.) and include reasons for recommended method; and following acceptance by Harare Water proceed with procurement;  Draft tender documentation for the Design development, Construction, Contract Administration and Inspection, Commissioning and Close Out of the works; using as a recommended standard, the following standard form of contract; o FIDIC Conditions of Contract for Electrical and Mechanical Works including Erection on Site (Yellow Book) Third Edition 1987 contract; o FIDIC Conditions of Contract for Works of Civil, Engineering Construction (Red Book), Fourth Edition 1987 (as updated) contract o General Conditions of Contract (1984); 3 Scope of Investigations 3.1 Project stages The services required in delivering the assignment are described in stages defined in accordance with the South African Guideline Scope of Services and Tariff of Fees for Registered Persons.  Stage One– Inception. Establish client requirements and preferences assess user needs and options, appointment of necessary consultants, and establish MJDB 007 | Issue | 19 November 2012 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ007 PLANT TWO FILTER GALLEY ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design the project brief including project objectives, priorities constraints, assumptions, aspirations and strategies.  Stage Two – Concept and Viability (Preliminary Design). Prepare and finalise the project concept in accordance with the brief, including project scope, scale, character, form and function, plus preliminary programme and viability of the project.  Stage Three– Design Development (Detailed Design). Develop the approved concept to finalise the design, outline specifications, cost plan, financial viability and programme for the project.  Stage Four – Documentation and Procurement. Prepare procurement and construction documentation, confirm and implement the procurement strategies and procedures for effective and timeous procurement of necessary resources for execution of the project.  Stage Five – Contract Administration and Inspection. Manage, administer and monitor the construction contracts and processes including preparation and coordination of procedures and documentation to facilitate practical completion of the Works.  Stage Six – Close Out Fulfil and complete the project close-out including necessary documentation to facilitate effective completion, handover and operation of the project. 3.2 Required project services This appointment will require the services of a Contractor to undertake all stages of the engineering design (Inception, Concept and Viability, Design Development Documentation and Procurement, Construction Administration and Inspection, and Close Out. 4 Required Experience 4.1 Tenderer’s Experience The experience of the Contractor will be evaluated on the basis of their experience in undertaking similar projects, either in Zimbabwe, or in SADC countries. The Tenderer is to show, with reference to his recent experience, that he is able to undertake such a project under Zimbabwean conditions. The evaluation will review the track record provided with regard to:  Design and management of similar programmes within the last ten years;  Practicality and successful completion of such projects to the client’s satisfaction;  Incorporation of state of the art equipment and systems;  Submission of a sufficiently well described preliminary design report, with recommendations. The description should be in tabular form with the following headings. Employer, contact Description of the Value of work Date completed person and contact works and specific provided details for both MJDB 007 | Issue | 19 November 2012 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ007 PLANT TWO FILTER GALLEY ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design person and client services provided The scoring of the experience will be as follows. Poor No equivalent or verifiable experience, Satisfactory Five or less equivalent and verifiable projects Good Five to ten equivalent and verifiable projects Very Good More than ten equivalent and verifiable projects 4.2 Experience of key personnel The tenderer will be required to show, for the following key personnel, their skills, qualifications, and experiences. 4.2.1 Project Manager Registered with the ECZ and ten years’ experience with managing similar projects 4.2.2 Civil/Structural Design Engineer Registered with ECZ, and five years similar experience, degree or diploma qualified, Member of ZIE. 4.2.3 Electrical Design Engineer Registered with ECZ, and five years similar experience, degree or diploma qualified, member of ZIE. 4.2.4 Mechanical Design Engineer Registered with ECZ, and five years similar experience, degree or diploma qualified, member of ZIE. 4.2.5 Particulars The description should be in tabular form with the following headings: Name and date of birth Nationality Tertiary Qualification (degree/diploma, institution, date obtained) Current Employer, position and length of employment Outline of last ten years of experience, organisation, year, position, project, outline of assignment (showing bearing on this assignment) Score General experience Adequacy for Knowledge of issues pertinent to MJDB 007 | Issue | 19 November 2012 Page 4 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ007 PLANT TWO FILTER GALLEY ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design assignment project Poor (0 – 40) None or limited(<5 None or limited None or limited years) relevant pertinent experience(<2 knowledge(<2 years) years) Reasonable(>5years) Reasonable Reasonable Satisfactory(41- relevant pertinent 70) experience(2-5 knowledge (2-5 years) years) Extensive(>10years) Extensive Extensive Good (71-90) relevant pertinent experience(>5 knowledge(>5 years) years) Extensive(>20 Extensive Extensive Very Good(90+) years) relevant pertinent experience(>10 knowledge(>10 years) years) MJDB 007 | Issue | 19 November 2012 Page 5 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ007 PLANT TWO FILTER GALLEY ISSUE.DOCX Appendix I Design Brief MJ008 Overall Design City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design MJDB 008 Issue | 19 November 2012 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191-00 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd Arup (Pty) Ltd Postnet Suite No.93 Private Bag X1 Melrose Arch Johannesburg 2076 South Africa www.arup.com Document Verification Job title 1031794 – Technical Assistance for Water and Job number Wastewater Treatment Works in the City of Harare 219191-00 Document title Draft Project Brief – Morton Jaffray Water File reference Treatment Works Refurbishment Design Document ref MJDB 008 Revision Date Filename MJ Design Brief MJ008.docx Draft 1 18/10/20 Description First draft 12 Prepared by Checked by Approved by Name Andy Robertshaw Jeff Broome Mark Tindale Signature Issue 19 Nov Design Brief MJ008 issue.docx 2012 A M Robertshaw Signature Filename Description Prepared by Checked by Approved by Name Signature Filename Description Prepared by Checked by Approved by Name Signature Issue Document Verification with Document  MJDB 008 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ008 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design Contents Page 1 Background 1 2 Scope of Work 1 3 Project Rationale and Objectives 3 3.1 • Project Objectives 3 4 Proposed Solution 3 5 Scope of Investigations, Survey and Design 4 5.1 Project stages 4 5.2 Required project services 4 6 Required Experience 5 6.1 Tenderer’s Experience 5 6.2 Experience of key personnel 6 MJDB 008 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ008 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design 1 Background Harare Water, a semi-autonomous entity within the City of Harare, has obtained funding to implement the refurbishment programme at the Morton Jaffray Works. Morton Jaffray is the City of Harare’s primary potable water source, and has been developed in four stages, being: • Plant One, constructed in 1953, was a 45 Mld works, treating water abstracted from Lake Chivero through an offshore intake tower, comprises head works and chemical dosing plant, two 33.5m diameter clarifiers, 12 rapid gravity filers (Paterson), three pumps housed in Pumpstation One, and a 750mm diameter steel pipeline to Warren Control and Lochinvar; • Plant One was extended in the late 1950’s, by 115Mld with an Accentrifloc clarifier, 14 additional rapid gravity filters, three pumps housed in Pumpstation Two, and a 1000mm steel pipeline to Warren Control; • Plant One was extended again to deal with the eutrophied raw water, with three additional vertical up-flow hopper bottomed clarifiers, and one Pulsator clarifier; • A new intake tower, Intake Tower Two, designed to abstract water at different levels, and so take advantage of best quality water, a connecting tunnel terminating in a riser shaft near the current mixing chamber, was completed in 1973 • Plant Two, a 227 Mld works constructed 1976 comprised a new mixing chamber, chemical dosing and storage, three Pulsator clarifiers, 18 double filters and a clear water well, an extension to Pumpstation Two to accommodate four pumps, and a 1300mm steel pipeline to Warren Control; • Plant Three, a 227 Mld works constructed 1994, effectively duplicated Plant Two; allowed for treatment of water from the Manyame Dam, delivered through a tunnel and lifted to the works by the Darwendale pumps; and comprised a new mixing chamber, chemical dosing and storage, three Pulsator clarifiers, 18 double filters and a clear water well, an extension to Pumpstation Two to accommodate four pumps, and a 1300mm steel pipeline to Warren Control. Note : The Procurement of goods and services for Harare Water is conducted through the Zimbabwe State Procurement Board. 2 Scope of Work This appointment is for the preliminary engineering design: together with recommendations for design development, construction procurement, inspection and project close out: needed to provide an overall integrated design for the entire works, which will account for the existing plant, equipment and progresses. The design will require the services of a number of specialists with experience in the design of water treatment works and covering the following fields of expertise: MJDB 008 | Issue | 19 November 2012 Page 1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ008 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design  Civil engineering;  Electrical engineering;  Mechanical engineering;  Process control;  Process engineering;  Structural engineering. The overall scope will include:  Inception Phase of study o Obtain all records and information on the works; o Review each plant in turn, i.e. Plant One, Plant Two and Plant Three and prepare an overall plant schematic, showing infrastructure and current process flow o Prepare inception report detailing project objectives, constraints, refurbishment philosophy, assumptions, and propose recommendations leading to the Concept and Viability (Preliminary Design) stage ;  Prepare the Concept and Viability report study on the refurbishment of the entire works.  Undertake preliminary design of o Overall process; o Electrical supply requirements, including power demand estimation, adequacy of bulk supply (ZESA), power use optimisation, power factor correction o Integrated control system for all parts of the works, including overall control at a Master Control Centre, but allowing local control of each unit process; o Mechanical design, piping and rotating equipment (size all major equipment) needed; o Piping, valves o Civil and structural engineering to support the installation of above plant and equipment.  Preparation of budget prices for the refurbishment;  Propose procurement method(i.e. design and constructed, turnkey, etc.) and include reasons for recommended method; and following acceptance by Harare Water proceed with procurement;  Draft tender documentation for the Design development, Construction, Contract administration and Inspection, commissioning and Close Out of the works; using as a recommended standard, the following standard form of contract; MJDB 008 | Issue | 19 November 2012 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ008 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design o FIDIC Conditions of Contract for Electrical and Mechanical Works including Erection on Site (Yellow Book) Third Edition 1987 contract; o FIDIC Conditions of Contract for Works of Civil, Engineering Construction (Red Book), Fourth Edition 1987 (as updated) contract o General Conditions of Contract (1984); 3 Project Rationale and Objectives 3.1 • Project Objectives 4 Proposed Solution In order to meet the requirements of the refurbishment project, the following will need to be undertaken:  Review and document process design;  Undertake concept control, mechanical and electrical design for each Plant;  Identify the power and control needs of each piece of equipment within the plant;  Identify the local and master control systems requirements ;  Integrate the local stand-alone control with the overall, plant wide automation and control system;  Propose the SCADA control system needed, together with equipment, cabling, signal equipment, taking in to account the countries telecommunication regulation, legal framework; operations and maintenance support networks, lightning frequency and long term system reliability  Identify civil/structural works and undertake preliminary design, including design sketches;  Identify such inspections and surveys as are needed to complete preliminary design, agree this with Harare Water counterpart then commission, and monitor progress to completion. Outputs Design report and tender documentation, including preliminary schedule of quantities, design requirements, standards and specifications, sufficient for use by the appointed Design and Construct Contractor’s engineering team Plant is to be specified on the basis of whole life cost, reliability, durability and the availability of local capacity for service and repair. MJDB 008 | Issue | 19 November 2012 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ008 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design 5 Scope of Investigations, Survey and Design 5.1 Project stages The services required in delivering the assignment are described in stages defined in accordance with the South African Guideline Scope of Services and Tariff of Fees for Registered Persons.  Stage One– Inception. Establish client requirements and preferences assess user needs and options, appointment of necessary consultants, and establish the project brief including project objectives, priorities constraints, assumptions, aspirations and strategies.  Stage Two – Concept and Viability (Preliminary Design). Prepare and finalise the project concept in accordance with the brief, including project scope, scale, character, form and function, plus preliminary programme and viability of the project.  Stage Three– Design Development (Detailed Design). Develop the approved concept to finalise the design, outline specifications, cost plan, financial viability and programme for the project.  Stage Four – Documentation and Procurement. Prepare procurement and construction documentation, confirm and implement the procurement strategies and procedures for effective and timeous procurement of necessary resources for execution of the project.  Stage Five – Contract Administration and Inspection. Manage, administer and monitor the construction contracts and processes including preparation and coordination of procedures and documentation to facilitate practical completion of the Works.  Stage Six – Close Out Fulfil and complete the project close-out including necessary documentation to facilitate effective completion, handover and operation of the project. 5.2 Required project services This appointment will require the services of a Contractor (“Consulting Water Treatment Works Specialist”) to undertake the Stage One and Stage Two as described above. 5.2.1 Stage One 5.2.1.1 Existing data The Contractor shall in the first instance obtain all the available existing documentation relating to all phases of the Morton Jaffray Works. 5.2.1.2 Investigations and surveys Investigations shall include at least the follow:  An assessment of the condition of all plant and equipment and their suitability for repair and reuse; MJDB 008 | Issue | 19 November 2012 Page 4 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ008 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design  An assessment of the condition of the inflow, outflow, sludge drain and discharge pipes;  An assessment of the safety and adequacy of the electrical power supply. Where information necessary for design or future records are not available, the Contractor shall arrange for these surveys and investigations to be carried out. These may include:  Topographic surveys of pipeline routes; and  Surveys of the clarifier, chambers and existing installations; 5.2.1.3 Inception phase acceptance criteria The Contractor shall consult with Harare Water at the end of the Inception phase, and obtain written approval from Harare Water, prior to continuing to the next project phase. 5.2.2 Stage 2 – Concept and Viability (Preliminary Design) 5.2.2.1 Activities Activities covered under Stage 2 would include, but not be limited to:  An assessment of the design capacity of the clarifier treated;  Preliminary process design for chemical dosing, mixing, and clarification process, with process flow diagramme and preliminary equipment list  Selection of the preferred repair or replacement option;  Outline of the preferred control philosophy and instrumentation required  Valve arrangements. 5.2.2.2 Preliminary design acceptance criteria The Contractor shall consult with Harare Water at the end of the Preliminary Design phase, and written design approval is required from Harare Water, prior to continuing to the next project phase 6 Required Experience 6.1 Tenderer’s Experience The experience of the Tenderer, or the team provided as a joint venture, consortium, or any other form of collaborative working, will be evaluated on the basis of their experience in undertaking similar projects, either in Zimbabwe, or in SADC countries. The Tenderer is to show, with reference to his recent experience, that he is able to undertake such a project under Zimbabwean conditions. The evaluation will review the track record provided with regard to:  Management of similar programmes within the last ten years; MJDB 008 | Issue | 19 November 2012 Page 5 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ008 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design  Practicality and successful completion of such projects to the client’s satisfaction;  Incorporation of state of the art equipment and systems;  Submission of a sufficiently well described preliminary design report, with recommendations. The description should be in tabular form with the following headings. Employer, contact Description of the Value of work Date completed person and contact works and specific provided details for both services provided person and client The scoring of the experience will be as follows. Poor No equivalent or verifiable experience, Satisfactory Five or less equivalent and verifiable projects Good Five to ten equivalent and verifiable projects Very Good More than ten equivalent and verifiable projects 6.2 Experience of key personnel The tenderer will be required to show, for the following key personnel, their skills, qualifications, and experiences. 6.2.1 Project Manager Registered with the ECZ and ten years’ experience with managing similar projects 6.2.2 Civil/Structural Design Engineer Registered with ECZ, and five years similar experience, degree or diploma qualified, Member of ZIE. 6.2.3 Electrical Design Engineer Registered with ECZ, and five years similar experience, degree or diploma qualified, member of ZIE. 6.2.4 Mechanical Design Engineer Registered with ECZ, and five years similar experience, degree or diploma qualified, member of ZIE. 6.2.5 Particulars The description should be in tabular form with the following headings: Name and date of birth MJDB 008 | Issue | 19 November 2012 Page 6 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ008 OVERALL DESIGN ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Morton Jaffray Water Treatment Works Refurbishment Design Nationality Tertiary Qualification (degree/diploma, institution, date obtained) Current Employer, position and length of employment Outline of last ten years of experience, organisation, year, position, project, outline of assignment (showing bearing on this assignment) Score General experience Adequacy for Knowledge of assignment issues pertinent to project Poor (0 – 40) None or limited(<5 None or limited None or limited years) relevant pertinent experience(<2 knowledge(<2 years) years) Reasonable(>5years) Reasonable Reasonable Satisfactory(41- relevant pertinent 70) experience(2-5 knowledge (2-5 years) years) Extensive(>10years) Extensive Extensive Good (71-90) relevant pertinent experience(>5 knowledge(>5 years) years) Extensive(>20 Extensive Extensive Very Good(90+) years) relevant pertinent experience(>10 knowledge(>10 years) years) MJDB 008 | Issue | 19 November 2012 Page 7 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ008 OVERALL DESIGN ISSUE.DOCX Appendix J Design Brief 1 Firle Effluent City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Final Effluent Pumpstation and Rising Mains, Firle WwTW WWDB 001 Rev A | 19 November 2012 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191-00 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd Arup (Pty) Ltd Postnet Suite No.93 Private Bag X1 Melrose Arch Johannesburg 2076 South Africa www.arup.com Document Verification Job title 1031794 – Technical Assistance for Water and Job number Wastewater Treatment Works in the City of Harare 219191-00 Document title Draft Project Brief – Final Effluent Pumpstation File reference and Rising Mains, Firle WwTW Document ref WWDB 001 Revision Date Filename Design Brief 001 Firle Effluent.docx Draft 1 23 Jul Description First draft 2012 Prepared by Checked by Approved by Name Jeff Broome Andy Robertshaw Andy Robertshaw Signature Issue 24 Oct Filename Design Brief 001 Firle Effluent issue for comment.docx 2012 Description issue for comment Prepared by Checked by Approved by Name J Broome A Robertshaw Signature Rev A 19 Nov Filename Design Brief 001 Firle Effluent.docx 2012 Description Prepared by Checked by Approved by Name J Broome A Robertshaw Signature Filename Description Prepared by Checked by Approved by Name WWDB 001 | Rev A | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 001 FIRLE EFFLUENT.DOCX Signature Issue Document Verification with Document  WWDB 001 | Rev A | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 001 FIRLE EFFLUENT.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Final Effluent Pumpstation and Rising Mains, Firle WwTW Contents Page 1 Background 1 2 Project Rationale and Objectives 1 2.1 Project Objectives 1 3 Proposed Solution 1 4 Scope of Work 2 5 Scope of Investigations, Survey and Design 2 5.1 Project stages 2 5.2 Stage 1– Inception 3 5.3 Stage 2 – Concept and Viability (Preliminary Design) 3 5.4 Stage 3– Design Development (Detailed Design) 4 5.5 Stage 4 – Documentation and Procurement 4 5.6 Stage 5 – Contract Administration and Inspection 6 5.7 Stage 6 – Close Out 6 Appendices Appendix A Guideline Scope of Services Appendix B Value Engineering Opportunities WWDB 001 | Rev A | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 001 FIRLE EFFLUENT.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Final Effluent Pumpstation and Rising Mains, Firle WwTW 1 Background Harare Water, a semi-autonomous entity within the City of Harare, has obtained funding to carry out repairs and improvements to Firle Wastewater Treatment Works. This is to include the final effluent disposal system at the works which is in need of significant rehabilitation. Treated effluent is pumped to farms and disposed of by irrigation of pasture land. There are two pumpstations at Firle, the older one is known as the Existing Effluent Pumpstation (EEPS) and the newer as the New Effluent Pumpstation (NEPS). The current project is to be carried out at the EEPS and on the rising mains between the works and the farms. Under the Urban Water Supply and Sanitation Rehabilitation Project, 3 number pumps are to be procured and sections of the rising mains to be replaced. This assignment is to check on the suitability of the pumps being procured and recommend any changes if necessary and design and procure permanent repairs or replacement of the rising mains, control systems, pipework and valves. It is proposed to engage a firm of consulting engineers (‘the consultant’) to carry out the assignment to carry out the necessary investigations and surveys, prepare designs and tender documents for procuring the works and supervising the construction phase. Note : The Procurement of goods and services for Harare Water is conducted through the Zimbabwe State Procurement Board. 2 Project Rationale and Objectives The project rationale is to limit the discharge of pollutants into the Mukuvisi River by transferring treated effluent that does not meet the required discharge standards to farmland for irrigation. The effluent pipelines also carry sludge from the works also for disposal on farmland. 2.1 Project Objectives The objectives are to:  Return the EEPS to full and safe operating condition able to meet the required duty and under full automatic control; and  Refurbish or rehabilitate the rising main pipelines to eliminate bursts, leakage and pollution incidents. 3 Proposed Solution It is proposed that the pumpstation be equipped with new pumps capable of delivering the required duty and the pipework internal to the pumpstation repaired or replaced to give a design life of 60 years of safe operation. The rising mains, valves, etc. are to be repaired or replaced to give a design life of 60 years. In WWDB 001 | Rev A | 19 November 2012 Page 1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 001 FIRLE EFFLUENT.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Final Effluent Pumpstation and Rising Mains, Firle WwTW addition necessary repairs and improvements to the pumpstation fabric are to be carried out. The philosophy to be adopted is that the existing plant and equipment is to be reused to the maximum extent possible that is consistent with economic, safety and reliability considerations. Plant is to be specified on the basis of whole life cost, reliability, durability and the availability of local capacity for service and repair. The pumpstation is located below ground and so is vulnerable to flooding and so it is recommended that an assessment of whether resilience could be improved by choice of pump type and motor location, the selection of immersible pump motors or other measures. 4 Scope of Work The scope of work for the assignment will include, but not necessarily limited to the following items of work:  Carry out all necessary investigations and surveys to permit the design of repairs and improvements to the pumping systems and rising mains at the EEPS;  Select the most suitable pumping system for installation at EEPS;  Check the specification for pumps which are to be procured under a separate contract for their suitability for the proposed duty and make recommendations for adjustments, if necessary;  Design the necessary works to return the EEPS to full and efficient operational condition;  Design the necessary works to replace or repair the pipework and rising mains for delivering effluent to the farms for irrigation  Prepare tender documents, tender, carry out tender analysis and supervise construction testing and commissioning of the works; 5 Scope of Investigations, Survey and Design 5.1 Project stages The services required in delivering the assignment are described in stages defined in accordance with the South African Guideline Scope of Services and Tariff of Fees for Registered Persons 2010. In general the duties of the Consultant shall be as detailed in this guideline document with additional detail provided below identifying areas where particular requirements or where particular attention is thought to be required. The stages are briefly described in Appendix A. WWDB 001 | Rev A | 19 November 2012 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 001 FIRLE EFFLUENT.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Final Effluent Pumpstation and Rising Mains, Firle WwTW 5.2 Stage 1– Inception 5.2.1 Existing data The Consultant shall in the first instance obtain all the available existing documentation relating to the effluent pumpstations, sludge injection pumps, power supply rising mains and storage dams. 5.2.2 Investigations and surveys Investigations shall include at least the follow:  An assessment of the condition of all plant, equipment and buildings and their suitability for repair and reuse;  An assessment of the condition of the effluent rising mains;  An investigation into the feasibility and suitability of relining or other means of in situ remediation of the existing effluent rising mains; and  An assessment of the safety and adequacy of the electrical power supply. Where information necessary for design or future records are not available, the Consultant shall arrange for these surveys and investigations to be carried out. These may include:  Topographic surveys of pipeline routes;  Geotechnical investigations of pipeline routes; and  Surveys of the buildings, chambers and existing installations. 5.2.3 Procurement strategy Contractors’ competence to carry out proposed works may be assessed through a pre-qualification process or the qualification data may be submitted together with the completed tender and used for determining the contractor’s suitability during the tender evaluation process (post-qualification). The procurement strategy should be agreed between the Consultant and Harare Water at an early stage to enable pre-qualification to be carried out, should this strategy be adopted. 5.3 Stage 2 – Concept and Viability (Preliminary Design) Activities covered under Stage 2 would include, but not be limited to:  An assessment of the amount of effluent treated, including that treated to a standard suitable for direct discharge to the river and that requiring disposal by irrigation plus of the volume of sewage bypassing treatment;  Determination of the duty design envelope for the pumpstation;  Selection of the preferred duty arrangements (Number of pumps for duty, assist, standby etc.)  Selection of the preferred pump type, including suitability for pumping effluent (throughlet, solids handling capability, pump materials, etc.); WWDB 001 | Rev A | 19 November 2012 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 001 FIRLE EFFLUENT.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Final Effluent Pumpstation and Rising Mains, Firle WwTW  Selection of the preferred repair or replacement option for the rising mains manifolds, valves etc;  Outline of the preferred control philosophy and instrumentation required; and  Valve arrangements. 5.4 Stage 3– Design Development (Detailed Design) 5.4.1 Design In terms of pumps that are to be procured under other contracts the design development phase will be concerned with developing the criteria for checking the pump selection. If additional pumps are to be procured under the project, the design criteria shall be used as the basis of any additional tender. The design works shall include at least the following:  Determination of the system characteristics and preparation of system curves defining the operating envelope for pumps for checking pumps already being procured and for inclusion in the Tender Documents for additional pumps. This would include determination of:  Static head  NPSH available  Pipeline characteristics  Required pump characteristics including:  Duty point;  Pump acceptance test grade in accordance with BS EN ISO 9906:2012;  Efficiency; and  Power reserve at runout  Transient analysis, particularly for the effects of loss of power.  Design of all pipework, manifolds, valves, etc.;  Identify and design a suitable system to minimise the probability of and potential damage caused by flooding of the pumpstation dry well;  Design of all required repairs and improvements to the pumpstation building, chambers and associated structures;  Design of all required electrical and control works.  Detailed life cycle costing of options; and  Determination of liquidated damages that will be applicable for under performance of pumps, etc. 5.5 Stage 4 – Documentation and Procurement 5.5.1 General Some elements of the project could be tendered on a design and build basis. If this is the case, the elements to be designed by the contactor must be clearly identified WWDB 001 | Rev A | 19 November 2012 Page 4 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 001 FIRLE EFFLUENT.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Final Effluent Pumpstation and Rising Mains, Firle WwTW in the Tender Documents. The total extent of investigations, surveys and design work required will not be reduced, all items identified in section 4 of this Brief must be included either in either the Consultant’s or the Tenderer’s scope. 5.5.2 Contents of Tender Documents 5.5.2.1 Form of Contract The form of contract is likely to be determined to a large extent by the funding agency’s requirements and the amount of design for which the Contractor will be responsible, rather than any preference of Harare Water. The requirements for the Appendix to the form of contract and Special Conditions of Contract are dealt with in general terms of the FIDIC Short Form of Contract in the General Project Brief. 5.5.3 Pre-qualification documents If pre-qualification is to be used, the Consultant will be responsible for producing the required documentation and evaluating the returns. The Consultant shall then prepare a Pre-qualification Report including recommendations to Harare Water on which contractors will qualify for possible award of the contract. 5.5.3.1 Specification The Specification will be based on the relevant sections of the Standard Specification the SAZS and SANS 1200. Any additions and modifications to the requirements of SANS shall be incorporated in the particular Specification and shall be framed in accordance with the requirements of SANS 1200. Additional standards will be in SAZS standards, where available, or British or other internationally recognised standards. The Particular Specification shall define at least the following:  Location and limits of the site;  Security requirements and procedures;  Access to site;  Handover of the site including responsibilities for isolation of services and any diversions required;  Facilities to be provided by the Employer;  Facilities to be provided by the Contractor, including accommodation and facilities for staff and the Employer;  Applicable legislation’ including employees’ protection and environmental protection;  Health and safety requirements;  Contractor’s liabilities, including for pollution incidents;  Contractor’s design responsibilities and liabilities;  Requirements for acceptance testing for pumps and other equipment shall be specified including: WWDB 001 | Rev A | 19 November 2012 Page 5 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 001 FIRLE EFFLUENT.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Final Effluent Pumpstation and Rising Mains, Firle WwTW  Requirements for witnessing of tests;  Grade of acceptance testing required for pumps;  Responsibility for costs of testing and witnessing.  Particular attention should be paid to defining the type, frequency and required standards for all other testing.  The requirements for Commissioning shall be specified in detail including responsibility for supply of equipment, responsibility for costs of consumables for initial testing and re-testing where necessary;  Requirements for reliability and takeover testing;  Requirements for training of Harare Water staff in the operations and maintenance of the works;  Conditions and procedures for takeover by the Employer.  Post-qualification data (if there is no pre-qualification). 5.5.3.2 Contractor’s documentation The specification shall define the documentation to be provided by the Contractor. In particular it should specify the format and content of the required documents that should include:  Requirements for the tender programme specifying format, milestones etc.;  Requirements for submission of additional programmes specifying frequency of submission, penalties for failure to submit, format, milestones etc.;  Risk assessments and method statements for particular activities;  A detailed commissioning plan;  Scale and accuracy for ‘as built’ and design drawings;  Items of work for which calculations are required;  Construction completion report, including all test certificates, inspection reports and other quality assurance documentation;  Operations and maintenance manuals; and  Inputs to a health and safety file for the project including details of suppliers and particular risks associated with the operation, maintenance and decommissioning of the works. 5.6 Stage 5 – Contract Administration and Inspection The Consultant shall provide suitably qualified and experienced staff to supervise construction. This shall include where necessary attendance at acceptance testing and actively facilitating, supervising and witnessing commissioning. 5.7 Stage 6 – Close Out No additions to the normal duties of the Consultant are anticipated. WWDB 001 | Rev A | 19 November 2012 Page 6 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 001 FIRLE EFFLUENT.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Final Effluent Pumpstation and Rising Mains, Firle WwTW 5.7.1.1 Consultant’s documentation The Consultant shall deliver the following documentation in addition to the tender documentation issued at Stage 4:  All background information collected and results of surveys and investigations conducted;  Drawings showing the layout and longitudinal sections of all major sewers (> 300 mm diameter) in the catchment of the existing Budiriro sewage pumpstation;  A design report detailing the assumptions, parameters and methods used for the design of the works; and  A health and safety file including the basis of design, particular risks associated with the operation, maintenance and decommissioning of the works and contact details for all parties involved. WWDB 001 | Rev A | 19 November 2012 Page 7 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 001 FIRLE EFFLUENT.DOCX Appendix A Guideline Scope of Services City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Final Effluent Pumpstation and Rising Mains, Firle WwTW A1 Guideline Scope of Services A1.1 Planning, studies, investigations and Assessments Planning, studies, investigations and Assessments are considered separately from the ‘normal services’ required for engineering projects. The services that may be required are summarised as: These typical services relate to carrying out studies and investigations as well as the preparation and submission of reports embodying preliminary proposals or initial feasibility studies . . . A1.2 Stage 1– Inception Establish client requirements and preferences, assess user needs and options, appointment of necessary consultants, establish the project brief including project objectives, priorities constraints, assumptions, aspirations and strategies. A1.3 Stage 2 – Concept and Viability (Preliminary Design) Prepare and finalise the project concept in accordance with the brief, including project scope, scale, character, form and function, plus preliminary programme and viability of the project. A1.4 Stage 3– Design Development (Detailed Design) Develop the approved concept to finalise the design, outline specifications, cost plan, financial viability and programme for the project. A1.5 Stage 4 – Documentation and Procurement Prepare procurement and construction documentation, confirm and implement the procurement strategies and procedures for effective and timeous procurement of necessary resources for execution of the project. A1.6 Stage 5 – Contract Administration and Inspection Manage, administer and monitor the construction contracts and processes including preparation and coordination of procedures and documentation to facilitate practical completion of the Works. A1.7 Stage 6 – Close Out Fulfil and complete the project close-out including necessary documentation to facilitate effective completion, handover and operation of the project. WWDB 001 | Rev A | 19 November 2012 Page A1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 001 FIRLE EFFLUENT.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Final Effluent Pumpstation and Rising Mains, Firle WwTW Appendix B Value Engineering Opportunities WWDB 001 | Rev A | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 001 FIRLE EFFLUENT.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Final Effluent Pumpstation and Rising Mains, Firle WwTW B1 Value Engineering Opportunities B1.1 Purpose This Appendix includes suggestions for strategies that may be considered as ways of reducing capital and operational costs of the infrastructure required to fulfil the objectives of the project. B1.2 In-situ Sewer Rehabilitation It is frequently quicker, cheaper and simpler to repair, reline or replace sewers and other pipelines using ‘no-dig’ methods, instead of replacing or duplicating them in excavated trenches. A wide variety of techniques are available which include slip lining pipes with a closely fitting plastics or glass fibre liners, in-situ lining with glass fibre structural, or non-structural lining, or pipe bursting to pull a new pipe through the ground following the existing one which is broken up, but left in place. Where a pipe lining is inserted into an existing pipe, although the internal diameter may be reduced, the flow capacity of the pipe may not be affected because of the smoother surface of the new pipe. The economics of an approach of this type will need to be investigated in some detail to determine whether any of the available options will be suitable for use in Zimbabwe. Important considerations include whether the existing pipe will have sufficient remaining structural strength, the flow capacity and the design life of the refurbished pipeline. It is to be expected that specialist contractors in South Africa would be interested in co-operating with the Consultant in determining the appropriateness of the various techniques available. Guidance on the rehabilitation of sewers is given in the Sewer Renovation Manual, 4th edition, WRc, 2001 or the Sewerage Risk Management Website: http://srm.wrcplc.co.uk/ WWDB 001 | Rev A | 19 November 2012 Page B1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 001 FIRLE EFFLUENT.DOCX Appendix K Design Brief 2 Little Marimba City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan WWDB 002 Issue | 19 November 2012 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191-00 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd Arup (Pty) Ltd Postnet Suite No.93 Private Bag X1 Melrose Arch Johannesburg 2076 South Africa www.arup.com Document Verification Job title 1031794 – Technical Assistance for Water and Job number Wastewater Treatment Works in the City of Harare 219191-00 Document title Draft Project Brief – Little Marimba Outfall Sewer File reference and Strategic Plan Document ref WWDB 002 Revision Date Filename Design Brief 002 Little Marimba.docx Draft 1 11 Aug Description First draft 2012 Prepared by Checked by Approved by Name Jeff Broome Andy Robertshaw Andy Robertshaw Signature Issue 24 Oct Filename Design Brief 002 Little Marimba issue for comment.docx 2012 Description issue for comment Prepared by Checked by Approved by Name Signature Issue 19 Nov Filename Design Brief 002 Little Marimba issue.docx 2012 Description Issue for use Prepared by Checked by Approved by Name J Broome A Robertshaw A Robertshaw Signature Issue Document Verification with Document  WWDB 002 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan Contents Page 1 Background 2 2 Project Rationale and Objectives 2 2.1 Project Objectives 2 3 Proposed Solution 3 4 Scope of Project 3 5 Scope of Investigations, Survey and Design 3 5.1 Project stages 3 5.2 Planning, Studies, Investigations and Assessments 3 5.3 Stage 1– Inception 3 5.4 Stage 2 – Concept and Viability (Preliminary Design) 4 5.5 Stage 3– Design Development (Detailed Design) 4 5.6 Stage 4 – Documentation and Procurement 5 5.7 Stage 5 – Contract Administration and Inspection 7 5.8 Stage 6 – Close Out 7 Appendices Appendix A Guideline Scope of Services Appendix B Value Engineering Options WWDB 002 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan 1 Background Harare Water, a semi-autonomous entity within the City of Harare, has obtained funding to carry out some repairs to the Little Marimba Outfall, which is in a poor state of repair with numerous collapses and sewage spilling at many places. While these repairs may address some immediate problems, it will be necessary to review the sewerage system for the whole of the Little Marimba catchment before permanent solutions can be identified and implemented. The principal reason for this being the spread of the city towards the northwest and the extensive development that has taken place within the area, leading to increased sewage generation which probably exceeds the capacity of the existing sewers now and will certainly in the future. Implementation of the construction will be phased with an initial recovery phase where the planned repair works will be consolidated and augmented and one or more future phases to accommodate new developments in the catchment. It is proposed to engage a firm of consulting engineers (‘the Consultant’) for the assignment to  Carry out the necessary investigations and surveys;  Prepare a strategic plan for the entire catchment;  Prepare designs and tender documents for procuring the works required for the initial ‘recovery’ phase;  Assist Harare Water to engage a contractor (‘the Contractor’) to carry out the works; and  Supervise and administer the contract for construction of the works. Note : The Procurement of goods and services for Harare Water is conducted through the Zimbabwe State Procurement Board. 2 Project Rationale and Objectives The project rationale is to eliminate overflows and discharge of sewage into the Little Marimba River and provide capacity to accommodate the likely future development within the catchment. It is intended that this planning exercise will form a pilot for the complete revision of the Sewerage master plan for Harare and will establish the methodology and standards for future planning. 2.1 Project Objectives The objectives for the Little Marimba Project are to:  Develop a strategic sewerage plan with a design horizon of twenty years for the Little Marimba catchment that will cater for effective sanitation for all residents and protect water resources from pollution; WWDB 002 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan  Return the Little Marimba Outfall Sewer to its original design capacity to minimise the discharge of sewage into the Little Marimba River. 3 Proposed Solution The proposed solution is to prepare a strategic plan for the Little Marimba catchment and implement the necessary civil works to restore the sewerage system to at least the original design capacity. Longer term plans should include consideration of the best location for additional sewage treatment capacity, provision of adequate sewer capacity to transfer the wastewater to the works for treatment and how appropriate sanitation services can be delivered to areas of the catchment that cannot be served by gravity sewers. This may include on-site sanitation systems, decentralised collection and treatment or, as a last resort, raw sewage pumping. 4 Scope of Project The scope of work for the project will include, but not necessarily limited to the following items of work:  Carry out the investigations necessary and prepare a strategic sewerage plan for the Little Marimba catchment; and  Return the Little Marimba Outfall sewer to its original design capacity. 5 Scope of Investigations, Survey and Design 5.1 Project stages The services required in delivering the assignment are described in stages defined in accordance with the South African Guideline Scope of Services and Tariff of Fees for Registered Persons 2010. In general the duties of the Consultant shall be as detailed in this guideline document with additional detail provided below identifying areas where particular requirements or where particular attention is thought to be required. An outline of the stages is included in Appendix A. 5.2 Planning, Studies, Investigations and Assessments Some initial studies will be required to define the scope of the project. This will include site visits, preliminary investigations of a sample of sewer locations, establishing contact with various council departments such as planning and housing of the City of Harare and the Department of Physical Planning of the Ministry of Local Government, Rural and Urban Development and ascertaining the availability of drawings and design data. 5.3 Stage 1– Inception The inception stage will include the normal tasks required to fully define the project scope and objectives will in addition include at least the following: WWDB 002 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan  Identify and map the area that can be served by gravity sewerage to the existing Crowborough WwTW;  Identify and map adjacent areas that cannot be drained by gravity to Crowborough or any other existing WwTW;  Agree with Harare Water the extent of the project area to be covered by the strategic plan and the various time horizons (recovery phase, short-term, medium and long term);  Obtain and collate all existing information and drawings relating to the sewerage reticulation system for the Little Marimba catchment; and  Determine the scope and format of the surveys necessary to prepare the strategic plan and the necessary civil works to restore the capacity of the Marimba Outfall Sewer to at least its original design capacity. 5.3.1 Procurement strategy Contractors’ competence to carry out proposed works may be assessed through a pre- qualification process or the qualification data may be submitted together with the completed tender and used for determining the contractor’s suitability during the tender evaluation process (post-qualification). The procurement strategy should be agreed between the Consultant and Harare Water at an early stage to enable pre-qualification to be carried out, should this strategy be adopted. 5.4 Stage 2 – Concept and Viability (Preliminary Design) To fully define the project, activities covered under Stage 2 would include, but not be limited to:  Enumeration of the existing number of housing units using aerial photography  Sample survey of housing occupancy rates;  Survey of the physical condition of the Marimba Outfall Sewer and other sewers as necessary, particularly identifying sources of stormwater and grit ingress;  Survey domestic and commercial drainage to identify sources of stormwater and grit ingress, such as gully gratings set below ground level;  Survey the sewer to determine hydraulic properties where data is missing, or questionable.  Agree design standards and design parameters with Harare Water, such as water consumption and sewage return factors. 5.5 Stage 3– Design Development (Detailed Design) 5.5.1 Draft strategic plan The following steps are envisaged in the development of the strategic plan:  Calculate the design carrying capacity of the existing sewerage system including conducting any necessary additional surveys where design data cannot be found; WWDB 002 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan  Obtain details for all planned development in the catchment and, in liaison with the COH Planning Department and developers, to establish credible projections for the future development within the catchment;  Develop credible estimates of sewage generation and flow regimes;  Identify areas where predicted flows will exceed design capacity at various time horizons;  Investigate innovative and lower cost approaches to reduce sewage overflows, such as sewage detention basins and alternative hydraulic design criteria (see Appendix B);  Investigate alternative methods for the in-situ repair of sewers, such as slip lining and cured in place linings, and recommend whether any are viable (see Appendix B);  Investigate available sewer pipe materials and recommend the most appropriate alternatives for use in Harare;  Conduct consultations with residents and other stakeholders regarding alternative solutions and service levels;  Develop a strategic plan to meet the objectives of providing effective and appropriate sanitation to all residents, businesses and institutions within the catchment, including a phased investment plan; and  For any areas that cannot realistically be drained to existing wastewater treatment works by gravity, identify viable options for local treatment (either partial or full), including effluent disposal, solids free sewerage, on-site disposal or pumping to existing or planned sewers. Phase 1 Implementation  Design the refurbishment, repair and replacement works required for returning the Little Marimba Outfall Sewer to full operation ;  Design all other appropriate civil works to address shortfalls in capacity for the recovery phase; and  Prepare outline designs for the subsequent phases of the strategic plan. 5.6 Stage 4 – Documentation and Procurement 5.6.1 General Some elements of the project could be tendered on a design and build basis. If this is the case, the elements to be designed by the contactor must be clearly identified in the Tender Documents. The total extent of investigations, surveys and design work required will not be reduced, all items identified in section 4 of this Brief must be included either in either the Consultant’s or the Tenderer’s scope. 5.6.2 Pre-qualification documents If pre-qualification is to be used, the Consultant will be responsible for producing the required documentation and evaluating the returns. The Consultant shall then prepare a Pre-qualification Report including recommendations to Harare Water on which contractors will qualify for possible award of the contract. WWDB 002 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan 5.6.3 Contents of Tender Documents The tender documents shall be for the implementation of the first or recovery phase only. Detailed design and implementation of subsequent phases is to be carried out in line with the 5.6.3.1 Form of Contract The form of contract is likely to be determined to a large extent by the funding agency’s requirements and the amount of design for which the Contractor will be responsible, rather than any preference of Harare Water. The requirements for the Appendix to the form of contract and Special Conditions of Contract are dealt with using the standard forms that form part of the FIDIC Short Form of Contract. 5.6.3.2 Specification The Specification should be based on the relevant sections of the Standard Specification the SAZS and SANS 1200. Any additions and modifications to the requirements of SANS shall be incorporated in the particular Specification and shall be framed in accordance with the requirements of SANS 1200. Additional standards will be SAZS standards, where available, or British or other internationally recognised standards. The Particular Specification shall define at least the following:  Location and limits of the site;  Security requirements and procedures;  Access to site;  Handover of the site including responsibilities for isolation of services and any diversions required;  Facilities to be provided by the Employer;  Facilities to be provided by the Contractor, including accommodation and facilities for staff and the Employer;  Applicable legislation’ including employees’ protection and environmental protection;  Health and safety requirements;  Contractor’s liabilities, including for pollution incidents;  Contractor’s design responsibilities and liabilities;  Specification for in-situ lining or repair of existing pipelines (if acceptable). Care needs to be exercised to ensure that the specification is generic and does not favour one supplier or manufacturer;  Requirements for acceptance testing for pumps (if required) and other equipment shall be specified including:  Requirements for witnessing of tests;  Grade of acceptance testing required for pumps;  Responsibility for costs of testing and witnessing. WWDB 002 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan  Particular attention should be paid to defining the type, frequency and required standards for all other testing.  The requirements for Commissioning shall be specified in detail including responsibility for supply of equipment, responsibility for costs of consumables for initial testing and re-testing where necessary;  Requirements for reliability and takeover testing;  Requirements for training of Harare Water staff in the operations and maintenance of the works;  Conditions and procedures for takeover by the Employer; and  Post-qualification data (if there is no pre-qualification). 5.6.3.3 Contractor’s documentation The specification shall define the documentation to be provided by the Contractor. In particular it should specify the format and content of the required documents that should include:  Requirements for the tender programme specifying format, milestones etc;  Requirements for submission of regular updates of the programme specifying frequency, penalties for failure to submit, format, milestones etc.;  Risk assessments and method statements for particular activities;  A detailed commissioning plan;  Scale and accuracy for ‘as built’ and design drawings;  Items of work for which calculations are required;  Construction completion report;  Operations and maintenance manuals; and  Inputs to a health and safety file for the project including details of suppliers and particular risks associated with the operation, maintenance and decommissioning of the works. 5.7 Stage 5 – Contract Administration and Inspection The Consultant shall provide suitably qualified and experienced staff to supervise construction. This shall include where necessary attendance at acceptance testing and actively facilitating, supervising and witnessing commissioning. 5.8 Stage 6 – Close Out No additions to the normal duties of the Consultant are anticipated apart from:  Host and conduct a workshop to present and discuss the draft strategic plan with Harare Water staff, and representatives from other local authorities, government, the donor community and other potential funding agencies. WWDB 002 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan 5.8.1 Consultant’s documentation The Consultant shall deliver the following documentation in addition to the tender documentation issued at Stage 4:  All background information collected and results of surveys and investigations conducted;  A report on the feasibility of in-situ relining or repair of sewers;  A report on the availability, cost and suitability of sewer pipe materials  A report on the condition of the Marimba Outfall Sewer and connecting sewers up to 300 mm nominal diameter;  Drawings showing the layout and longitudinal sections of all major sewers in the Little Marimba catchment;  A strategic plan for sewerage and sewage disposal in the Little Marimba catchment as defined in Section 5.5 and including recommendations for developing and applying the methodology to cover the whole Harare area; and  A health and safety file including the basis of design, particular risks associated with the operation, maintenance and decommissioning of the works and contact details for all parties involved. WWDB 002 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan Appendix A Guideline Scope of Services WWDB 002 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan A1 Guideline Scope of Services A1.1 Planning, studies, investigations and Assessments Planning, studies, investigations and Assessments are considered separately from the ‘normal services’ required for engineering projects. The services that may be required are summarised as: …. These typical services relate to carrying out studies and investigations as well as the preparation and submission of reports embodying preliminary proposals or initial feasibility studies. … A1.2 Stage 1– Inception Establish client requirements and preferences, assess user needs and options, appointment of necessary consultants, establish the project brief including project objectives, priorities constraints, assumptions, aspirations and strategies. A1.3 Stage 2 – Concept and Viability (Preliminary Design) Prepare and finalise the project concept in accordance with the brief, including project scope, scale, character, form and function, plus preliminary programme and viability of the project. A1.4 Stage 3– Design Development (Detailed Design) Develop the approved concept to finalise the design, outline specifications, cost plan, financial viability and programme for the project. A1.5 Stage 4 – Documentation and Procurement Prepare procurement and construction documentation, confirm and implement the procurement strategies and procedures for effective and timeous procurement of necessary resources for execution of the project. A1.6 Stage 5 – Contract Administration and Inspection Manage, administer and monitor the construction contracts and processes including preparation and coordination of procedures and documentation to facilitate practical completion of the Works. WWDB 002 | Issue | 19 November 2012 Page A1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan A1.7 Stage 6 – Close Out Fulfil and complete the project close-out including necessary documentation to facilitate effective completion, handover and operation of the project. WWDB 002 | Issue | 19 November 2012 Page A2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan Appendix B Value Engineering Options WWDB 002 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan B1 Value Engineering Opportunities B1.1 Purpose This Appendix includes suggestions for strategies that may be considered as ways of reducing capital and operational costs of the infrastructure required to fulfil the objectives of the project. B1.2 Sewer Overflows It is common practice in many countries to provide overflows on sewers that transport large volumes of stormwater. Usually there are designed to discharge screened sewage directly into water courses, but this is not really an option in Harare where the majority of rivers discharge directly into Lake Chivero, the main water source for the city. However, it would be possible to adapt this approach for some parts of the sewerage system where existing bottlenecks would cause sewage to spill at high flows in any case. Options for dealing with the sewage discharged would include:  Storage in a detention pond and pumping back to the sewer at periods of lower flow;  Partial treatment in waste stabilisation ponds and effluent pumped back into the sewer;  Partial treatment in waste stabilisation ponds and effluent pumped to disposal by irrigation; and  Treatment and discharge. Pumping partially treated effluent instead of raw sewage would have a number of advantages, particularly the removal of most solids, which, if the effluent is to be pumped, specialised pumps would not be required and maintenance would be reduced. B1.3 Sewer Design methodology Grit ingress into sewers is a major problem in Zimbabwe and it is recommended that a design check be carried out in accordance with CIRIA Report R 141, Design of Sewers to Control Sediment Problems, see http://www.ciria.org/service/bookshop/core/orders/product.aspx?prodid=280 . This report specifies additional checks to ensure that sewers are designed to transport the expected grit load at normal flows, which should reduce future maintenance requirements. An alternative to this would be to use boundary shear stress design throughout. This design method can result in more economic sewer design and, if the appropriate value is chosen for the average boundary shear stress, would automatically ensure that the requirements of CIRIA Report R141 are met. For extensive information on the design and implementation of ‘simplified sewerage’, as the methodology is often referred to, see http://www.personal.leeds.ac.uk/~cen6ddm/simpsew.html . WWDB 002 | Issue | 19 November 2012 Page B1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan The implementation of simplified sewerage for one or more areas would not only be significantly cheaper than conventional designs, but would also serve the very valuable function of a pilot or demonstration scheme for Zimbabwe. Should the design approach prove successful and acceptable, infrastructure provision for housing could be made significantly cheaper than current practices. B1.4 In-situ Sewer Rehabilitation It is frequently quicker, cheaper and simpler to repair, reline or replace sewers and other pipelines using ‘no-dig’ methods, instead of replacing or duplicating them in excavated trenches. A wide variety of techniques are available which include slip lining pipes with a closely fitting plastics or glass fibre liners, in-situ lining with glass fibre structural, or non-structural lining, or pipe bursting to pull a new pipe through the ground following the existing one which is broken up, but left in place. Where a pipe lining is inserted into an existing pipe, although the internal diameter may be reduced, the flow capacity of the pipe may not be affected because of the smoother surface of the new pipe. The economics of an approach of this type will need to be investigated in some detail to determine whether any of the available options will be suitable for use in Zimbabwe. Important considerations include whether the existing pipe will have sufficient remaining structural strength, the flow capacity and the design life of the refurbished pipeline. It is to be expected that specialist contractors in South Africa would be interested in co-operating with the Consultant in determining the appropriateness of the various techniques available. Guidance on the rehabilitation of sewers is given in the Sewer Renovation Manual, 4th edition, WRc, 2001 or the Sewerage Risk Management Website: http://srm.wrcplc.co.uk/ B1.5 Areas that cannot be served by gravity As the city spreads towards the west, there are likely to be a number of areas that cannot be connected to the outfall sewer by gravity and which unless water borne sewerage is provided are likely to contribute to the pollution load on Lake Chivero. There are several alternative and innovative techniques that should be explored. B1.5.1 Solids free sewerage This is similar in concept to the sewered aqua privies that were installed in Tafara many years ago and were eventually abandoned as being totally impractical. However, with careful design and higher standards of construction and fewer larger interceptor tanks, this might be a useful approach as it would result in lower peak flows and avoid many of the problems of pumping raw sewage. The additional cost of installing interception tanks would be more than offset by significant savings in the sewerage reticulation and pumping costs, although there would be the additional costs of desludging the tanks at infrequent intervals. WWDB 002 | Issue | 19 November 2012 Page B2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Little Marimba Outfall Sewer and Strategic Plan B1.5.2 Treatment Alternatively other forms of treatment or partial treatment may be used prior to pumping the effluent back to the sewer or to disposal by irrigation, in a similar manner to that proposed with the sewer overflows discussed in section B1.1. Treatment may be as simple as a single anaerobic pond, or preferably a pair of anaerobic ponds to allow one to be taken out of service for emptying, to a series of ponds producing effluent that is suitable for irrigation. The treatment system can also be designed to minimise peak flows by including some temporary storage in the treatment system, thus reducing the required size for the pumpstations and rising mains. WWDB 002 | Issue | 19 November 2012 Page B3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 002 LITTLE MARIMBA ISSUE.DOCX Appendix L Design Brief 3 Mafakose Pumpstation City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Mufakose and Humus Sludge Pumpstation , Crowborough WwTW WWDB 003 Rev A | 19 November 2012 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191-00 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd Arup (Pty) Ltd Postnet Suite No.93 Private Bag X1 Melrose Arch Johannesburg 2076 South Africa www.arup.com Document Verification Job title 1031794 – Technical Assistance for Water and Job number Wastewater Treatment Works in the City of Harare 219191-00 Document title Draft Project Brief – Mufakose and Humus Sludge File reference Pumpstation , Crowborough WwTW Document ref WWDB 003 Revision Date Filename Design Brief 003 Mufakose Pstn.docx Draft 1 23 Jul Description First draft 2012 Prepared by Checked by Approved by Name Jeff Broome Andy Robertshaw Andy Robertshaw Signature Issue 24 Oct Design Brief 003 Mufakose Pumpstation issue for Filename 2012 comment.docx Description issue for comment Prepared by Checked by Approved by Name Jeff Broome Andy Robertshaw Signature Rev A 19 Nov Filename Design Brief 003 Mufakose Pumpstation issue.docx 2012 Description Prepared by Checked by Approved by Name Jeff Broome Andy Robertshaw Signature Filename Description Prepared by Checked by Approved by Name WWDB 003 | Rev A | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 003 MUFAKOSE PUMPSTATION ISSUE.DOCX Signature Issue Document Verification with Document  WWDB 003 | Rev A | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 003 MUFAKOSE PUMPSTATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Mufakose and Humus Sludge Pumpstation , Crowborough WwTW Contents Page 1 Background 1 2 Project Rationale and Objectives 1 2.1 Project Objectives 1 3 Proposed Solution 1 4 Scope of Project 2 5 Scope of Investigations, Survey and Design 2 5.1 Project stages 2 5.2 Planning, Studies, Investigations and Assessments 2 5.3 Stage 1– Inception 2 5.4 Stage 2 – Concept and Viability (Preliminary Design) 3 5.5 Stage 3– Design Development (Detailed Design) 4 5.6 Stage 4 – Documentation and Procurement 5 5.7 Stage 5 – Contract Administration and Inspection 7 5.8 Stage 6 – Close Out 8 Appendices Appendix A Guideline Scope of Services Appendix B Value Engineering Opportunities WWDB 003 | Rev A | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 003 MUFAKOSE PUMPSTATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Mufakose and Humus Sludge Pumpstation , Crowborough WwTW 1 Background Harare Water, a semi-autonomous entity within the City of Harare, which is responsible for water supply and sanitation in the city and has received funding for refurbishment of trickling filters at Crowborough WwTW. The works currently being implemented or are in the process of being procured include cleaning and refurbishment of the primary sedimentation tanks and sludge pumpstation, the filters and distributors and the humus tanks. The sludge from the humus tanks used to be discharged to the pumpstation that lifts raw sewage from the Mufakose Outfall Sewer up the inlet works, but this pumpstation is out of action and the sewer is not functioning. Without pumps and without raw sewage to dilute the sludge, it will not be possible to operate the trickling filters, thus rendering the investment in refurbishment works completely ineffective. It is proposed to engage a firm of consulting engineers (‘the Consultant’) for the assignment to carry out the necessary investigations and surveys, prepare designs and tender documents for procuring the works and supervising the construction phase. Note : The Procurement of goods and services for Harare Water is conducted through the Zimbabwe State Procurement Board. 2 Project Rationale and Objectives The project rationale is to bring the trickling filters into service, and to eliminate as far as possible the discharge of raw sewage from the Mufakose Outfall Sewer. 2.1 Project Objectives The objectives of the project will be to:  Eliminate or substantially reduce discharge of raw sewage from the Mufakose Outfall Sewer into the Marimba River  Return the trickling filters of Units 1 and 2 at Crowborough WwTW to sustainable operation 3 Proposed Solution To achieve the objectives it is proposed that:  The Mufakose Outfall Sewer be repaired, or if necessary completely replaced;  The Mufakose sewage pumpstation at Crowborough returned to service; and  The humus sludge from Crowborough Units 1 and 2 be pumped to the inlet works via the Mufakose Sewage Pumpstation. WWDB 003 | Rev A | 19 November 2012 Page 1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 003 MUFAKOSE PUMPSTATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Mufakose and Humus Sludge Pumpstation , Crowborough WwTW 4 Scope of Project The scope of work for the assignment will include, but not necessarily limited to the following items of work:  Repair and replacement of pumps and equipment in the Mufakose Pumpstation;  Repair or replacement of the Mufakose Outfall Sewer; and  Repair or replacement of the rising main between the Mufakose Pumpstation and the inlet works. 5 Scope of Investigations, Survey and Design 5.1 Project stages The services required in delivering the assignment are described in stages defined in accordance with the South African Guideline Scope of Services and Tariff of Fees for Registered Persons 2010. In general the duties of the Consultant shall be as detailed in this guideline document with additional detail provided below identifying areas where particular requirements or where particular attention is thought to be required. The stages are briefly described in Appendix A. 5.2 Planning, Studies, Investigations and Assessments Some initial studies will be required to define the scope of the project. This will include site visits, preliminary investigations of a sample of sewer locations, establishing contact with various council departments such as planning and housing of the City of Harare and the Department of Physical Planning of the Ministry of Local Government, Rural and Urban Development and ascertaining the availability of drawings and design data. 5.3 Stage 1– Inception 5.3.1 Existing data The inception stage will include all the normal tasks required to fully define the project scope and objectives and shall in the first instance obtain all the available documentation relating the Mufakose Outfall Sewer and its catchment, pumpstation, humus tanks and sludge discharge arrangements. The Consultant shall in addition:  Map the area that can be served by gravity sewerage to the existing Crowborough WwTW via the Mufakose Outfall Sewer; and  Agree with Harare Water the extent of the catchment and design parameters, such as water consumption and sewage return factors. WWDB 003 | Rev A | 19 November 2012 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 003 MUFAKOSE PUMPSTATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Mufakose and Humus Sludge Pumpstation , Crowborough WwTW 5.3.2 Procurement strategy Contractors’ competence to carry out proposed works may be assessed through a pre-qualification process or the qualification data may be submitted together with the completed tender and used for determining the contractor’s suitability during the tender evaluation process (post-qualification). The procurement strategy should be agreed between the Consultant and Harare Water at an early stage to enable pre-qualification to be carried out, should this strategy be adopted. 5.4 Stage 2 – Concept and Viability (Preliminary Design) Investigations to be carried out under Stage 2 would include, but not be limited to:  A survey of the catchment of the Mufakose Outfall Sewer to determine the existing number of contributing connections and to make allowance for future development within the catchment;  A sample survey of housing occupancy rates;  A physical survey of the condition of Mufakose Outfall Sewer and other sewers as necessary, particularly identifying sources of stormwater and grit ingress;  A survey domestic and commercial premises to identify sources of stormwater and grit ingress, such as gully gratings set below ground level;  A survey the Mufakose Outfall Sewer to determine hydraulic properties where data is unavailable or questionable; and  A physical survey of the Mufakose Pumpstation, pipework, valves, controls and rising main. Preliminary design work would include, but not be limited to:  An estimate of the present and future sewage generation within the catchment and the likely flow pattern under currently constrained water supplies and future unrestricted supplies;  Formulation of recommendations for the repair, rehabilitation or replacement of the Mufakose Outfall Sewer and associated structures.  Formulation of recommendations for repairs and replacements to the sewerage reticulation to minimise grit and stormwater ingress;  Formulation of recommendations for the repair, rehabilitation or replacement of the rising main from the Mufakose pumpstation to the Crowborough WwTW inlet works to meet the capacity requirements for the estimated raw sewage and humus sludge quantities to be pumped;  Report on the feasibility and cost effectiveness of installing grit facilities for the Mufakose Pumpstation versus installation of grit handling pumps;  Formulation of recommendations for the type, duty and specification of the new raw sewage pumps for the Mufakose Pumpstation;  Formulation of recommendations for the repair and upgrading of the power supply to the Mufakose Pumpstation; WWDB 003 | Rev A | 19 November 2012 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 003 MUFAKOSE PUMPSTATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Mufakose and Humus Sludge Pumpstation , Crowborough WwTW  Formulation of recommendations for the control and monitoring of the pumpstation and inlet works; and  Agree with Harare Water the design parameters to be used for the design of the works, such as control philosophy, materials to be used and the required design life for specific parts of the works. 5.5 Stage 3– Design Development (Detailed Design) 5.5.1 Mufakose Outfall Sewer The design works required for the repair or replacement of the Mufakose Outfall Sewer should include, but not be limited to:  Finalise the design flows for the Mufakose Outfall Sewer and the pumpstation;  A hydraulic check of the capacity of the sewer with recommendations for upgrading, if required;  Designs for the cleaning, repair, rehabilitation or replacement of the Mufakose Outfall Sewer; and  Designs for repairs to structures and manholes to minimise the ingress of stormwater and grit. 5.5.2 Rising main Design the works required for refurbishing or replacing the rising main, as required, taking into account possibilities for slip lining or other means of in-situ repair and the diameter required to minimise sediment deposition, septicity and energy consumption. 5.5.3 Pumpstation and inlet works Design works related to the pumpstation and inlet works should include, but not be limited to:  Design of the grit removal system (if appropriate) and refurbishment of the inlet works to the pumpstation;  Determine the system characteristics of the proposed refurbished or replacement rising main and prepare system curves defining the operating envelope for pumps for inclusion in the Tender Documents. This would include determination of:  Static head  NPSH available  Pipeline characteristics  Determine the pump characteristics including:  Duty point;  Pump acceptance test grade in accordance with BS EN ISO 9906:2012;  Efficiency; and WWDB 003 | Rev A | 19 November 2012 Page 4 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 003 MUFAKOSE PUMPSTATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Mufakose and Humus Sludge Pumpstation , Crowborough WwTW  Power reserve at runout  Optimise the rising main and pump combination to minimise capital and operating costs and maintenance issues;  Carry out transient analysis, particularly for the effects of loss of power.  Design of all pipework, manifolds, valves, etc.;  Identify and design a suitable system to minimise the probability of and potential damage caused by flooding of the pumpstation dry well;  Design of all required repairs and improvements to the pumpstation building, chambers and associated structures;  Design of all required electrical and control works.  Design the refurbishment, repair and replacement works required for returning the Mufakose Outfall Sewer to full operation;  Detailed life cycle costing of options; and  Determination of liquidated damages that will be applicable for under performance of pumps, etc. 5.5.4 Particular design considerations The following factors are considered to be or particular importance for design of the works:  Risk of flooding: The Mufakose Pumpstation is located below ground level and given the possibility of flooding due to failure of dewatering pumps or the intermittency of power supplies, consideration should be given to installing immersible pumps. This would generally consist of installing submersible pumps in a dry well configuration; and  Health and safety: Designs must eliminate health and safety risks as far as practicable and mitigate any that cannot be removed. In the case of the inlet works to the pumpstation, the accumulation of gas is a problem that has been encountered in the past. If grit removal and screening cannot be designed with a fail-safe system to eliminate to eliminate the risk of accumulation of toxic or asphyxiating gases, an alternative, such as the pumping of sewage without preliminary treatment must be adopted. 5.6 Stage 4 – Documentation and Procurement 5.6.1 General Some elements of the project could be tendered on a design and build basis. If this is the case, the elements to be designed by the contactor must be clearly identified in the Tender Documents. The total extent of investigations, surveys and design work required will not be reduced, all items identified in section 4 of this Brief must be included either in either the Consultant’s or the Tenderer’s scope. WWDB 003 | Rev A | 19 November 2012 Page 5 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 003 MUFAKOSE PUMPSTATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Mufakose and Humus Sludge Pumpstation , Crowborough WwTW 5.6.2 Pre-qualification documents If pre-qualification is to be used, the Consultant will be responsible for producing the required documentation and evaluating the returns. The Consultant shall then prepare a Pre-qualification Report including recommendations to Harare Water on which contractors will qualify for possible award of the contract. 5.6.3 Contents of Tender Documents 5.6.3.1 Form of Contract The form of contract is likely to be determined to a large extent by the funding agency’s requirements and the amount of design for which the Contractor will be responsible, rather than any preference of Harare Water. The requirements for the Appendix to the form of contract and Special Conditions of Contract are dealt with in general terms of the FIDIC Short Form of Contract in the General Project Brief. 5.6.3.2 Specification The Specification will be based on the relevant sections of the Standard Specification the SAZS and SANS 1200. Any additions and modifications to the requirements of SANS shall be incorporated in the particular Specification and shall be framed in accordance with the requirements of SANS 1200. Additional standards will be in SAZS standards, where available, or British or other internationally recognised standards. The Particular Specification shall define at least the following:  Location and limits of the site;  Security requirements and procedures;  Access to site;  Handover of the site including responsibilities for isolation of services and any diversions required;  Facilities to be provided by the Employer;  Facilities to be provided by the Contractor, including accommodation and facilities for staff and the Employer;  Applicable legislation’ including employees’ protection and environmental protection;  Health and safety requirements;  Contractor’s liabilities, including for pollution incidents;  Contractor’s design responsibilities and liabilities;  Requirements for acceptance testing for pumps and other equipment shall be specified including:  Requirements for witnessing of tests;  Grade of acceptance testing to BS EN ISO 9906:2012 required for pumps;  Responsibility for costs of testing and witnessing. WWDB 003 | Rev A | 19 November 2012 Page 6 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 003 MUFAKOSE PUMPSTATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Mufakose and Humus Sludge Pumpstation , Crowborough WwTW  Particular attention should be paid to defining the type, frequency and required standards for all other testing.  The requirements for Commissioning shall be specified in detail including responsibility for supply of equipment, responsibility for costs of consumables for initial testing and re-testing where necessary;  Requirements for reliability and takeover testing;  Requirements for training of Harare Water staff in the operations and maintenance of the works;  Conditions and procedures for takeover by the Employer.  Post-qualification data (if there is no pre-qualification)) 5.6.3.3 Contractor’s documentation The specification shall define the documentation to be provided by the Contractor. In particular it should specify the format and content of the required documents that should include:  Requirements for the tender programme specifying format, milestones etc.;  Requirements for submission of additional programmes specifying frequency of submission, penalties for failure to submit, format, milestones etc.;  Risk assessments and method statements for particular activities;  A detailed commissioning plan;  Scale and accuracy required for ‘as built’ and design drawings;  Items of work for which calculations are required, including temporary works;  Construction completion report, including all test certificates, inspection reports and other quality assurance documentation;  Operations and maintenance manuals; and  Inputs to a health and safety file for the project including details of suppliers and particular risks associated with the operation, maintenance and decommissioning of the works. 5.6.3.4 Tender evaluation Following closure of tenders the Consultant shall check each submission for compliance and arithmetical accuracy and conduct an analysis of tender prices. In the case of post-qualification the tender evaluation will include an assessment of the capability of each contractor to carry out the works. The Consultant will compile a Tender Evaluation Report containing his recommendation for award of the contract. 5.7 Stage 5 – Contract Administration and Inspection The Consultant shall provide suitably qualified and experienced staff to supervise construction. This shall include where necessary attendance at acceptance testing and actively facilitating, supervising and witnessing commissioning. WWDB 003 | Rev A | 19 November 2012 Page 7 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 003 MUFAKOSE PUMPSTATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Mufakose and Humus Sludge Pumpstation , Crowborough WwTW 5.8 Stage 6 – Close Out No additions to the normal duties of the Consultant are anticipated. 5.8.1.1 Consultant’s documentation The Consultant shall deliver the following documentation in addition to the tender documentation issued at Stage 4:  All background information collected and results of surveys and investigations conducted;  A design report detailing the assumptions, parameters and methods used for the design of the works; and  A health and safety file including the basis of design, particular risks associated with the operation, maintenance and decommissioning of the works and contact details for all parties involved. WWDB 003 | Rev A | 19 November 2012 Page 8 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 003 MUFAKOSE PUMPSTATION ISSUE.DOCX Appendix A Guideline Scope of Services City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Mufakose and Humus Sludge Pumpstation , Crowborough WwTW A1 Guideline Scope of Services A1.1 Planning, studies, investigations and Assessments Planning, studies, investigations and Assessments are considered separately from the ‘normal services’ required for engineering projects. The services that may be required are summarised as: These typical services relate to carrying out studies and investigations as well as the preparation and submission of reports embodying preliminary proposals or initial feasibility studies . . . A1.2 Stage 1– Inception Establish client requirements and preferences assess user needs and options, appointment of necessary consultants, and establish the project brief including project objectives, priorities constraints, assumptions, aspirations and strategies. A1.3 Stage 2 – Concept and Viability (Preliminary Design) Prepare and finalise the project concept in accordance with the brief, including project scope, scale, character, form and function, plus preliminary programme and viability of the project. A1.4 Stage 3– Design Development (Detailed Design) Develop the approved concept to finalise the design, outline specifications, cost plan, financial viability and programme for the project. A1.5 Stage 4 – Documentation and Procurement Prepare procurement and construction documentation, confirm and implement the procurement strategies and procedures for effective and timeous procurement of necessary resources for execution of the project. A1.6 Stage 5 – Contract Administration and Inspection Manage, administer and monitor the construction contracts and processes including preparation and coordination of procedures and documentation to facilitate practical completion of the Works. A1.7 Stage 6 – Close Out Fulfil and complete the project close-out including necessary documentation to facilitate effective completion, handover and operation of the project. WWDB 003 | Rev A | 19 November 2012 Page A1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 003 MUFAKOSE PUMPSTATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Mufakose and Humus Sludge Pumpstation , Crowborough WwTW Appendix B Value Engineering Opportunities WWDB 003 | Rev A | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 003 MUFAKOSE PUMPSTATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Mufakose and Humus Sludge Pumpstation , Crowborough WwTW B1 Value Engineering Opportunities B1.1 Purpose This Appendix includes suggestions for strategies that may be considered as ways of reducing capital and operational costs of the infrastructure required to fulfil the objectives of the project. B1.2 Sewer Overflows It is common practice in many countries to provide overflows on sewers that transport large volumes of stormwater. Usually there are designed to discharge screened sewage directly into water courses, but this is not really an option in Harare where the majority of rivers discharge directly into Lake Chivero, the main water source for the city. However, it would be possible to adapt this approach for some parts of the sewerage system where existing bottlenecks would cause sewage to spill at high flows in any case. Options for dealing with the sewage discharged would include:  Storage in a detention pond and pumping back to the sewer at periods of lower flow;  Partial treatment in waste stabilisation ponds and effluent pumped back into the sewer;  Partial treatment in waste stabilisation ponds and effluent pumped to disposal by irrigation; and  Treatment and discharge. The provision of storm overflows would considerably reduce the cost of providing sewage pumping from the Mufakose Outfall, both in terms of the capital cost of providing the necessary capacity and in operating costs. At the Crowborough works this may require the construction of one or more new lagoons, but the existing waste stabilisation pond could possibly be used, if the hydraulics are favourable. Similarly, storage during periods without power would significantly reduce pollution. B1.3 Sewer Design methodology Grit ingress into sewers is a major problem in Zimbabwe and it is recommended that a design check be carried out in accordance with CIRIA Report R 141, Design of Sewers to Control Sediment Problems, see http://www.ciria.org/service/bookshop/core/orders/product.aspx?prodid=280 . This report specifies additional checks to ensure that sewers are designed to transport the expected grit load at normal flows, which should reduce future maintenance requirements. An alternative to this would be to use boundary shear stress design throughout. This design method can result in more economic sewer design and, if the appropriate value is chosen for the average boundary shear stress, would automatically ensure that the requirements of CIRIA Report R141 are met. For extensive information on the design and implementation of ‘simplified sewerage’, WWDB 003 | Rev A | 19 November 2012 Page B1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 003 MUFAKOSE PUMPSTATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Mufakose and Humus Sludge Pumpstation , Crowborough WwTW as the methodology is often referred to, see http://www.personal.leeds.ac.uk/~cen6ddm/simpsew.html . The implementation of simplified sewerage for one or more areas would not only be significantly cheaper than conventional designs, but would also serve the very valuable function of a pilot or demonstration scheme for Zimbabwe. Should the design approach prove successful and acceptable, infrastructure provision for housing could be made significantly cheaper than current practices. B1.4 In-situ Sewer Rehabilitation It is frequently quicker, cheaper and simpler to repair, reline or replace sewers and other pipelines using ‘no-dig’ methods, instead of replacing or duplicating them in excavated trenches. A wide variety of techniques are available which include slip lining pipes with a closely fitting plastics or glass fibre liners, in-situ lining with glass fibre structural, or non-structural lining, or pipe bursting to pull a new pipe through the ground following the existing one which is broken up, but left in place. Where a pipe lining is inserted into an existing pipe, although the internal diameter may be reduced, the flow capacity of the pipe may not be affected because of the smoother surface of the new pipe. The economics of an approach of this type will need to be investigated in some detail to determine whether any of the available options will be suitable for use in Zimbabwe. Important considerations include whether the existing pipe will have sufficient remaining structural strength, the flow capacity and the design life of the refurbished pipeline. It is to be expected that specialist contractors in South Africa would be interested in co-operating with the Consultant in determining the appropriateness of the various techniques available. Guidance on the rehabilitation of sewers is given in the Sewer Renovation Manual, 4th edition, WRc, 2001 or the Sewerage Risk Management Website: http://srm.wrcplc.co.uk/ WWDB 003 | Rev A | 19 November 2012 Page B2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 003 MUFAKOSE PUMPSTATION ISSUE.DOCX Appendix M Design Brief 4 Budiriro City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro WWDB 004 Issue | 24 October 2012 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191-00 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd Arup (Pty) Ltd Postnet Suite No.93 Private Bag X1 Melrose Arch Johannesburg 2076 South Africa www.arup.com Document Verification Job title 1031794 – Technical Assistance for Water and Job number Wastewater Treatment Works in the City of Harare 219191-00 Document title Draft Project Brief – Strategic Sewerage Plan and File reference Sewage Disposal, Budiriro Document ref WWDB 004 Revision Date Filename Design Brief 001 Firle Effluent.docx Draft 1 23 Jul Description First draft 2012 Prepared by Checked by Approved by Name Jeff Broome Andy Robertshaw Andy Robertshaw Signature Issue 24 Oct Filename Design Brief 004 Budiriro issue for comment.docx 2012 Description issue for comment Prepared by Checked by Approved by Name Jeff Broome Andy Robertshaw Andy Robertshaw Signature Filename Description Prepared by Checked by Approved by Name Jeff Broome Andy Robertshaw Signature Filename Description Prepared by Checked by Approved by Name Signature Issue Document Verification with Document  WWDB 004 | Issue | 24 October 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro Contents Page 1 Background 1 2 Project Rationale and Objectives 1 2.1 Project Objectives 1 3 Proposed Solution 2 4 Scope of project 2 5 Scope of Investigations, Survey and Design 2 5.1 Project stages 2 5.2 Planning, Studies, Investigations and Assessments 2 5.3 Stage 1– Inception 3 5.4 Stage 2 – Concept and Viability (Preliminary Design) 3 5.5 Stage 3 – Design Development (Detailed Design) 4 5.6 Stage 4 – Documentation and Procurement 6 5.7 Stage 5 – Contract Administration and Inspection 8 5.8 Stage 6 – Close Out 8 Appendices Appendix A Guideline Scope of Services Appendix B Value Engineering Options WWDB 004 | Issue | 24 October 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro 1 Background Harare Water, a semi-autonomous entity within the City of Harare, is responsible for water and sewerage services to the City and several neighbouring areas. The Budiriro catchment lies on the south western fringe of the city and formerly its sewage was pumped into an outfall sewer that discharges to the Firle WwTW. Unfortunately this pumpstation no longer functions and all sewage is discharged into surface water and drains untreated into Lake Chivero the main source for the City’s drinking water. There are substantial additional areas of housing planned within the catchment, but downstream of the pumpstation site and it is proposed to construct additional pumpstations to service these areas together with recommissioning and expanding the existing pumpstation. Because of the poor state of the existing sewer reticulation in the area and the intermittent nature of the power supply at present, it is proposed that a strategic plan be prepared for the Budiriro catchment followed by detailed design of the required infrastructure. This may include full or partial treatment of sewage before pumping or discharge, the construction of storm overflows with storage or treatment before pumping or disposal, or other strategies to limit the capital and operating costs of sewage disposal and to reduce the impact of sewage pumping from this area on the treatment works. It is proposed to engage a firm of consulting engineers (‘the Consultant’) for the assignment to:  Carry out the necessary investigations and surveys;  Prepare a strategic plan for the entire catchment;  Prepare designs and tender documents for procuring the works required for the initial ‘recovery’ phase;  Assist Harare Water to engage a contractor (the Contractor) to carry out the works; and  Supervising the construction of the works. Note : The Procurement of goods and services for Harare Water is conducted through the Zimbabwe State Procurement Board. 2 Project Rationale and Objectives The Budiriro area of Harare is located close to Lake Chivero, the main source of drinking water for the city and is a substantial source of pollution due to the failure of the pumpstation and numerous defects in the sewage system. 2.1 Project Objectives The objectives of the project will be to: WWDB 004 | Issue | 24 October 2012 Page 1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro  Develop a strategic sewerage plan with a design horizon of twenty years for the Budiriro catchment that will cater for effective sanitation for all residents and protect water resources from pollution;  Eliminate or minimise the discharge of raw sewage to the environment to the extent possible in the short term. 3 Proposed Solution It is anticipated that the solution will include a combination of sewage pumping, storm overflows and treatment or storage lagoons within the catchment. Rehabilitation or replacement of sewers will also be required to reduce the impact of stormwater and grit ingress into the sewerage system. 4 Scope of project The scope of work for the assignment will include, but not necessarily limited to the following items of work:  Investigate the feasibility and desirability of installing storm overflows with or without treatment;  Prepare a strategic sewerage plan for the Budiriro catchment incorporating a logical and cost-effective investment plan;  Install and commission sewage pumps, overflows, storage or treatment lagoons to minimise contamination of the environment with untreated sewage; and  Carry out essential repairs to the sewerage system in Budiriro. 5 Scope of Investigations, Survey and Design 5.1 Project stages The services required in delivering the assignment are described in stages defined in accordance with the South African Guideline Scope of Services and Tariff of Fees for Registered Persons 2010 (see Appendix A). In general the duties of the Consultant shall be as detailed in this guideline document with additional detail provided below identifying areas where particular requirements or where particular attention is thought to be required. 5.2 Planning, Studies, Investigations and Assessments Some initial studies will be required to define the scope of the project. This will include site visits, preliminary investigations of a sample of sewer locations, establishing contact with various council departments such as planning and housing of the City of Harare and the Department of Physical Planning of the Ministry of Local Government, Rural and Urban Development and ascertaining the availability of drawings and design data. WWDB 004 | Issue | 24 October 2012 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro 5.3 Stage 1– Inception 5.3.1 Existing data The inception stage will include the normal tasks required to fully define the project scope and objectives will in addition include at least the following:  Identify and map the area in the Budiriro catchment that cannot be served by gravity sewerage to the existing WwTWs;  Agree with Harare Water the extent of the project area to be covered by the strategic plan and the various time horizons (recovery phase, short-term, medium and long term);  Obtain and collate all existing information and drawings relating to the effluent pumpstations, power supply, rising mains, sewerage reticulation and development plans in the Budiriro catchment;  Review the existing Sewerage Master Plan; and  Determine the scope and format of the surveys necessary to prepare the strategic plan and the necessary civil works to minimise sewage spillage into the environment. 5.3.2 Procurement strategy Contractors’ competence to carry out proposed works may be assessed through a pre-qualification process or the qualification data may be submitted together with the completed tender and used for determining the contractor’s suitability during the tender evaluation process (post qualification). The procurement strategy should be agreed between the Consultant and Harare Water at an early stage to enable pre-qualification to be carried out, should this strategy be adopted. 5.4 Stage 2 – Concept and Viability (Preliminary Design) 5.4.1 Investigations and surveys Investigations shall include at least the following:  Enumeration of the existing number of housing units using aerial photography;  Estimation of future development within the catchment;  Sample survey of housing occupancy rates;  Survey of the physical condition of the sewerage network, particularly identifying sources of stormwater and grit ingress;  Survey domestic and commercial drainage to identify sources of stormwater and grit ingress, such as gully gratings set below ground level;  Survey the existing sewage pumpstation, inlet works and rising main to determine their condition and hydraulic properties where data is missing, or questionable. WWDB 004 | Issue | 24 October 2012 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro  Agree design standards and design parameters with Harare Water, such as water consumption and sewage return factors.  Consultation with stakeholders within the City of Harare and in Budiriro including planning authorities, developers, residents and businesses. 5.4.2 Strategic Sewerage plan It is expected that the tasks related to this would include, but not necessarily be limited to:  Define and agree the scope, objectives and methodology form development of the plan with Harare Water, bearing in mind that this may form a pilot for a comprehensive plan for the whole City.  Agree a list of value engineering opportunities to be investigated further with Harare Water (See Appendix B for some suggestions). 5.4.3 Infrastructure design Many aspects of design will be dependent on the strategy developed though the strategic planning process and cannot advance without adoption of the completed plan. However, some outline design activities will be required and will inform decision making during the development of the plan. This would include such items as:  Preparation of initial estimates of sewage generation for average dry weather flow, daily peak dry weather flow and wet weather flow;  Preparation of initial estimates of the required pumping capacity for various scenarios including pumping all flows, pumping reduced flow with stormwater storage or treatment introduced to the system, or decentralised treatment and disposal for parts of the catchment; and  Preparation of budget estimates for capital and operating costs for the various scenarios investigated. 5.5 Stage 3 – Design Development (Detailed Design) The design development stage will lag behind the finalisation of the strategic sewerage plan, but some decisions will be required before the document can be fully drafted and accepted. For instance, it is likely that decisions for serving areas of new development will be required and either temporary or permanent solutions for sewage disposal put in place so that the housing can be developed. It would also appear to be necessary to reinstate the existing sewage pumpstation, whatever overall strategy for the development of the catchment is adopted. Preparation of detailed designs for tender would only be required for works that are required within the short term horizon of the strategic plan. 5.5.1 Strategic sewerage plan The final elaboration and adoption of the strategic sewerage plan will require several stages including submission of drafts, consultation and opportunities for public comment before formal adoption and publication of the final version. WWDB 004 | Issue | 24 October 2012 Page 4 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro The strategic plan should include an investment plan detailing phasing of the works to maximise the benefits to the inhabitants of Budiriro and the environment. In particular, works to be constructed in the short term, within two or three years, should be defined in detail. The following tasks are expected to form part of defining the strategic plan:  Estimation existing and future sewage flows and flow patterns under currently constrained water supplies conditions and with future unrestricted supplies;  Hydraulic checks on the capacities of major sewers in the catchment;  Identification of areas that can be developed with gravity sewerage to the existing pumpstation location;  Identification of developable land that cannot be sewered by gravity to the existing pumpstation location; and  The development of recommendations for the future development of the sewerage system for the whole catchment, taking into consideration possible value engineering opportunities to reduce costs and environmental impacts of high flows (see suggestions in Appendix B). 5.5.2 Design Much of the design work for the infrastructure required within the short term will have to take place in parallel with the development and adoption of the strategic plan. This will almost certainly include at least the following:  Design of replacement or repair of the existing sewage pumping main and selection of compatible pumps;  Determination of the system characteristics and preparation of system curves defining the operating envelope for pumps for inclusion in the Tender Documents. This would include determination of:  Static head  NPSH available  Pipeline characteristics  Required pump characteristics including:  Duty point;  Pump acceptance test grade in accordance with BS EN ISO 9906:2012;  Efficiency; and  Power reserve at runout  Transient analysis, particularly for the effects of loss of power.  Design of new inlet works, preferably with manually cleaned grit channels and hand-raked screens so that sewage overflowing into storage or treatment during power cuts or storms is screened and de-gritted.  Design of all required repairs and improvements to the pumpstation building, chambers and associated structures;  Design of any overflow structures or sewage treatment facilities required; WWDB 004 | Issue | 24 October 2012 Page 5 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro  Preparation of standard designs and procedures for carrying out repairs to the existing sewage reticulation;  Design of any new sewers or pumpstations required.  Design of all required electrical and control works.  Detailed life cycle costing of options; and  Determination of liquidated damages that will be applicable for under performance of pumps, etc. 5.6 Stage 4 – Documentation and Procurement 5.6.1 General Some elements of the project could be tendered on a design and build basis. If this is the case, the elements to be designed by the contactor must be clearly identified in the Tender Documents. The total extent of investigations, surveys and design work required will not be reduced, all items identified in section 4 of this Brief must be included either in either the Consultant’s or the Tenderer’s scope. 5.6.2 Pre-qualification documents If pre-qualification is to be used, the Consultant will be responsible for producing the required documentation and evaluating the returns. The Consultant shall then prepare a Pre-qualification Report including recommendations to Harare Water on which contractors will qualify for possible award of the contract. 5.6.3 Contents of Tender Documents 5.6.3.1 Form of Contract The form of contract is likely to be determined to a large extent by the funding agency’s requirements and the amount of design for which the Contractor will be responsible, rather than any preference of Harare Water. The requirements for the Appendix to the form of contract and Special Conditions of Contract are dealt with in general terms of the FIDIC Short Form of Contract in the General Project Brief. 5.6.3.2 Specification The Specification will be based on the relevant sections of the Standard Specification the SAZS and SANS 1200. Any additions and modifications to the requirements of SANS shall be incorporated in the particular Specification and shall be framed in accordance with the requirements of SANS 1200. Additional standards will be in SAZS standards, where available, or British or other internationally recognised standards. The Particular Specification shall define at least the following:  Location and limits of the sites;  Security requirements and procedures; WWDB 004 | Issue | 24 October 2012 Page 6 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro  Access to sites;  Handover of the sites including responsibilities for isolation of services and any diversions required;  Facilities to be provided by the Employer;  Facilities to be provided by the Contractor, including accommodation and facilities for staff and the Employer;  Applicable legislation’ including employees’ protection and environmental protection;  Health and safety requirements;  Contractor’s liabilities, including for pollution incidents;  Contractor’s design responsibilities and liabilities;  Requirements for acceptance testing for pumps and other equipment shall be specified including:  Requirements for witnessing of tests;  Grade of acceptance testing required for pumps;  Responsibility for costs of testing and witnessing.  Particular attention should be paid to defining the type, frequency and required standards for all other testing.  The requirements for Commissioning shall be specified in detail including responsibility for supply of equipment, responsibility for costs of consumables for initial testing and re-testing where necessary;  Requirements for reliability and takeover testing;  Requirements for training of Harare Water staff in the operations and maintenance of the works;  Conditions and procedures for takeover by the Employer. 5.6.3.3 Contractor’s documentation The specification shall define the documentation to be provided by the Contractor. In particular it should specify the format and content of the required documents that should include:  Requirements for the tender programme specifying format, milestones etc.;  Requirements for submission of additional programmes specifying frequency of submission, penalties for failure to submit, format, milestones etc.;  Risk assessments and method statements for particular activities;  A detailed commissioning plan;  Scale and accuracy for ‘as built’ and design drawings;  Items of work for which calculations are required;  Construction completion report;  Operations and maintenance manuals; and WWDB 004 | Issue | 24 October 2012 Page 7 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro  Inputs to a health and safety file for the project including details of suppliers and particular risks associated with the operation, maintenance and decommissioning of the works. 5.7 Stage 5 – Contract Administration and Inspection The Consultant shall provide suitably qualified and experienced staff to supervise construction. This shall include where necessary attendance at acceptance testing and actively facilitating, supervising and witnessing commissioning. 5.8 Stage 6 – Close Out No additions to the normal duties of the Consultant are anticipated. 5.8.1.1 Consultant’s documentation The Consultant shall deliver the following documentation in addition to the pre- qualification documentation (if used) and tender documentation issued at Stage 4:  All background information collected and results of surveys and investigations conducted;  The draft and final Strategic Sewerage Plan documentation;  A design report detailing the works to be undertaken within the short term (two years);  A health and safety file including the basis of design, particular risks associated with the operation, maintenance and decommissioning of the works and contact details for all parties involved. WWDB 004 | Issue | 24 October 2012 Page 8 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro Appendix A Guideline Scope of Services WWDB 004 | Issue | 24 October 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro A1 Guideline Scope of Services A1.1 Planning, studies, investigations and Assessments Planning, studies, investigations and Assessments are considered separately from the ‘normal services’ required for engineering projects. The services that may be required are summarised as: These typical services relate to carrying out studies and investigations as well as the preparation and submission of reports embodying preliminary proposals or initial feasibility studies . . . A1.2 Stage 1– Inception Establish client requirements and preferences, assess user needs and options, appointment of necessary consultants, and establish the project brief including project objectives, priorities constraints, assumptions, aspirations and strategies. A1.3 Stage 2 – Concept and Viability (Preliminary Design) Prepare and finalise the project concept in accordance with the brief, including project scope, scale, character, form and function, plus preliminary programme and viability of the project. A1.4 Stage 3– Design Development (Detailed Design) Develop the approved concept to finalise the design, outline specifications, cost plan, financial viability and programme for the project. A1.5 Stage 4 – Documentation and Procurement Prepare procurement and construction documentation, confirm and implement the procurement strategies and procedures for effective and timeous procurement of necessary resources for execution of the project. A1.6 Stage 5 – Contract Administration and Inspection Manage, administer and monitor the construction contracts and processes including preparation and coordination of procedures and documentation to facilitate practical completion of the Works. A1.7 Stage 6 – Close Out Fulfil and complete the project close-out including necessary documentation to facilitate effective completion, handover and operation of the project. WWDB 004 | Issue | 24 October 2012 Page A1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro Appendix B Value Engineering Options WWDB 004 | Issue | 24 October 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro B1 Value Engineering Opportunities B1.1 Purpose This Appendix includes suggestions for strategies that may be considered as ways of reducing capital and operational costs of the infrastructure required to fulfil the objectives of the project. B1.2 Sewer Overflows It is common practice in many countries to provide overflows on sewers that transport large volumes of stormwater. Usually there are designed to discharge screened sewage directly into water courses, but this is not really an option in Harare where the majority of rivers discharge directly into Lake Chivero, the main water source for the city. However, it would be possible to adapt this approach for some parts of the sewerage system where existing bottlenecks would cause sewage to spill at high flows in any case. Options for dealing with the sewage discharged would include:  Storage in a detention pond and pumping back to the sewer at periods of lower flow;  Partial treatment in waste stabilisation ponds and effluent pumped back into the sewer;  Partial treatment in waste stabilisation ponds and effluent pumped to disposal by irrigation; and  Treatment and discharge. The provision of storm overflows would considerably reduce the cost of providing sewage pumping from the Budiriro area, both in terms of the capital cost of providing the necessary capacity and in operating costs. Similarly storage during periods without power would significantly reduce pollution. Pumping partially treated effluent instead of raw sewage would have a number of advantages, particularly the removal of most solids would permit the use of less specialised pumps and reduce maintenance requirements for pumpstations. B1.3 Sewer Design methodology Grit ingress into sewers is a major problem in Zimbabwe and it is recommended that a design check be carried out in accordance with CIRIA Report R 141, Design of Sewers to Control Sediment Problems, see http://www.ciria.org/service/bookshop/core/orders/product.aspx?prodid=280 . This report specifies additional checks to ensure that sewers are designed to transport the expected grit load at normal flows, which should reduce future maintenance requirements. An alternative to this would be to use boundary shear stress design throughout. This design method can result in more economic sewer design and, if the appropriate value is chosen for the average boundary shear stress, would automatically ensure that the requirements of CIRIA Report R141 are met. For extensive information on the design and implementation of ‘simplified sewerage’, WWDB 004 | Issue | 24 October 2012 Page B1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro as the methodology is often referred to, see http://www.personal.leeds.ac.uk/~cen6ddm/simpsew.html . The implementation of simplified sewerage for one or more areas would not only be significantly cheaper than conventional designs, but would also serve the very valuable function of a pilot or demonstration scheme for Zimbabwe. Should the design approach prove successful and acceptable, infrastructure provision for housing could be made significantly cheaper than current practices. B1.4 In-situ Sewer Rehabilitation It is frequently quicker, cheaper and simpler to repair, reline or replace sewers and other pipelines using ‘no-dig’ methods, instead of replacing or duplicating them in excavated trenches. A wide variety of techniques are available which include slip lining pipes with a closely fitting plastics or glass fibre liners, in-situ lining with glass fibre structural, or non-structural lining, or pipe bursting to pull a new pipe through the ground following the existing one which is broken up, but left in place. Where a pipe lining is inserted into an existing pipe, although the internal diameter may be reduced, the flow capacity of the pipe may not be affected because of the smoother surface of the new pipe. The economics of an approach of this type will need to be investigated in some detail to determine whether any of the available options will be suitable for use in Zimbabwe. Important considerations include whether the existing pipe will have sufficient remaining structural strength, the flow capacity and the design life of the refurbished pipeline. It is to be expected that specialist contractors in South Africa would be interested in co-operating with the Consultant in determining the appropriateness of the various techniques available. B1.5 Areas that cannot be served by gravity As the city spreads towards the west, there are likely to be a number of areas that cannot be connected to the outfall sewer by gravity and which unless water borne sewerage is provided are likely to contribute to the pollution load on Lake Chivero. There are several alternative and innovative techniques that should be explored. B1.5.1 Solids free sewerage This is similar in concept to the sewered aqua privies that were installed in Tafara many years ago and were eventually abandoned as being totally impractical. However, with careful design and higher standards of construction and fewer larger interceptor tanks, this might be a useful approach as it would result in lower peak flows and avoid many of the problems of pumping raw sewage. The additional cost of installing interception tanks would be more than offset by significant savings in the sewerage reticulation and pumping costs, although there would be the additional costs of desludging the tanks at infrequent intervals. WWDB 004 | Issue | 24 October 2012 Page B2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Strategic Sewerage Plan and Sewage Disposal, Budiriro B1.5.2 Treatment Alternatively other forms of treatment or partial treatment may be used prior to pumping the effluent back to the sewer or to disposal by irrigation, in a similar manner to that proposed with the sewer overflows discussed in section B1.1. Treatment may be as simple as a single anaerobic pond, or preferably a pair of anaerobic ponds to allow one to be taken out of service for emptying, to a series of ponds producing effluent that is suitable for irrigation. The treatment system can also be designed to minimise peak flows by including some temporary storage in the treatment system, thus reducing the required size for the pumpstations and rising mains. WWDB 004 | Issue | 24 October 2012 Page B3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 004 BUDIRIRO ISSUE.DOCX Appendix N Design Brief 5 Optimisation City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Optimisation of Sewage Treatment Plants WWDB 005 Issue | 19 November 2012 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191-00 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd Arup (Pty) Ltd Postnet Suite No.93 Private Bag X1 Melrose Arch Johannesburg 2076 South Africa www.arup.com Document Verification Job title 1031794 – Technical Assistance for Water and Job number Wastewater Treatment Works in the City of Harare 219191-00 Document title Draft Project Brief – Optimisation of Sewage File reference Treatment Plants Document ref WWDB 005 Revision Date Filename Draft 1 21 Sep Description First draft 2012 Prepared by Checked by Approved by Name Jeff Broome Andy Robertshaw Andy Robertshaw Signature Issue 24 Oct Filename Design Brief 005 Optimisation.docx 2012 Description issue for comment Prepared by Checked by Approved by Name J Broome A Robertshaw A Robertshaw Signature Issue 19 Nov Filename Design Brief 005 Optimisation issue.docx 2012 Description Prepared by Checked by Approved by Name J Broome A Robertshaw A Robertshaw Signature Filename Description Prepared by Checked by Approved by Name Signature Issue Document Verification with Document  WWDB 005 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 005 OPTIMISATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Optimisation of Sewage Treatment Plants Contents Page 1 Background 1 2 Project Rationale and Objectives 1 2.1 Project Objectives 1 3 Proposed Solution 1 4 Scope of Work 2 5 Scope of Investigations, Survey and Design 2 5.1 Project stages 2 5.2 Stage 1 – Inception 3 5.3 Stage 2 – Concept and Viability (Preliminary Design) 3 5.4 Stage 3– Design Development (Detailed Design) 3 5.5 Stage 4 – Documentation and Procurement 3 5.6 Stage 5 – Contract Administration and Inspection 5 5.7 Stage 6 – Close Out 5 Appendices Appendix A Guidelines Scope of Services WWDB 005 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 005 OPTIMISATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Optimisation of Sewage Treatment Plants 1 Background Harare Water, a semi-autonomous entity within the City of Harare, which is in the process of rehabilitating the sewage treatment plants serving the City. This includes a number of Biological Nutrient Removal (BNR) activated sludge sewage treatment plants. The project will cover the following plants: Location and Unit Number Year of commissioning Capacity (Mld) Firle Unit 3 1980 18 Firle Unit 4 1984 18 Firle Unit 5 (four streams) 1996 72 Crowborough Unit 3 1984 18 These plants are intended to produce treated sewage effluent that complies with the Environmental Management (Effluent and Solid Waste Disposal) Regulations, 2007 which stipulate onerous effluent quality requirements for discharge of effluent into the environment. Since re-commissioning the first of the rehabilitated plants, Harare Water have experienced difficulty in managing the process, particularly in the light of frequent power cuts of many hours duration. It is proposed to engage a firm of consulting engineers (‘the Consultant’) to prepare contract documents and supervise the work of a contractor (‘the Contractor’) who is experienced in the design and operation of sewage treatment works who will carry out the project described in this document. Note : The Procurement of goods and services for Harare Water is conducted through the Zimbabwe State Procurement Board. 2 Project Rationale and Objectives The project rationale is to ensure that the City’s BNR plants operate as effectively and efficiently as possible. 2.1 Project Objectives The objectives of the project are to:  Establish a system for characterising and monitoring raw sewage and effluent;  Maximise the compliance of the BNR plant effluents with the Environmental Management (Effluent and Solid Waste Disposal) Regulations;  Minimise the operating costs of the BNR plants: and  Ensure that training and operations manuals are in place for the continued optimal performance of the BNR plants. 3 Proposed Solution The proposed solution is to engage a contractor to assist Harare Water to operate and monitor the plants for an initial period of two years. Any modifications to the WWDB 005 | Issue | 19 November 2012 Page 1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 005 OPTIMISATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Optimisation of Sewage Treatment Plants BNR plants, with the exception of providing fixed instrumentation to monitor plant performance, would be covered by additional contracts. However, the Contractor will be responsible for any changes to operational matters required to investigate and optimise plant operating parameters. 4 Scope of Work The scope of work for the project will include, but not necessarily limited to the following items of work:  Advise and assist Harare Water with sampling, analysis, characterisation and monitoring of sewage and effluent;  Procure, install, test and commission any laboratory or other equipment necessary to effectively carry out the sampling, analysis and data management required to monitor and optimise plant performance;  Carry out sampling and analysis of sewage from various sources and locations to characterise typical sewage from a variety of types of industry and housing area;  Provide software for and assist Harare Water to establish a data management system to store analysis results and operational data, including provision for archiving and backup;  Conduct a process audit on all BNR plants covered by the project;  Procure, install test and commission instruments for monitoring of process parameters in each of the BNR plants (it is not anticipated that automatic control will be installed as part of the project);  Review process design of each design of BNR plant, recommend any changes that would improve performance and carry out outline design of the required works;  Adjust operating parameters and practices to optimise treatment performance and power consumption, including mitigation of the effects of interruptions to the power supply;  Carry out training of Harare Water operations and laboratory staff; and  Prepare revised operations and maintenance manuals reflecting optimised operating procedures and parameters. 5 Scope of Investigations, Survey and Design 5.1 Project stages The services required in delivering the assignment are described in stages defined in accordance with the South African Guideline Scope of Services and Tariff of Fees for Registered Persons 2010. In general the duties of the Consultant shall be as detailed in this guideline document with additional detail provided below identifying areas where particular requirements or where particular attention is thought to be required. A brief outline of the stages is included in Appendix A. WWDB 005 | Issue | 19 November 2012 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 005 OPTIMISATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Optimisation of Sewage Treatment Plants 5.2 Stage 1 – Inception 5.2.1 Existing data The Consultant shall in the first instance obtain all the available existing documentation relating to the BNR plants. 5.2.2 Procurement strategy Contractors’ competence to carry out proposed works may be assessed through a pre-qualification process or the qualification data may be submitted together with the completed tender and used for determining the contractor’s suitability during the tender evaluation process (post-qualification). The procurement strategy should be agreed between the Consultant and Harare Water at an early stage to enable pre-qualification to be carried out, should this strategy be adopted. 5.3 Stage 2 – Concept and Viability (Preliminary Design) The Consultant, in co-operation with Harare Water, will determine:  The facilities, equipment and staff to be available by Harare Water to operate the BNR plants and carry out sampling, analysis and data management;  Current and historic operating procedures and parameters for the BNR plants:  A provisional list of laboratory and other equipment that will be required for carrying out the project;  A provisional list of instruments required for real time monitoring and control of each of the BNR plants; and  Any other data that would be relevant to the Contractor. 5.4 Stage 3– Design Development (Detailed Design) Any design works, including process design would be carried out by the Contractor. Detailed design works are not envisaged to be part of either the Consultant’s or Contractor’s scope. 5.5 Stage 4 – Documentation and Procurement 5.5.1 General This is mainly a service contract and the tender documents need to specify the services required in detail. Some equipment and instruments will be procured and installed in the project. It must be clear that the Contractor will make the final selection of what is required. WWDB 005 | Issue | 19 November 2012 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 005 OPTIMISATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Optimisation of Sewage Treatment Plants 5.5.2 Contents of Tender Documents 5.5.2.1 Form of Contract The form of contract is likely to be determined to a large extent by the funding agency’s requirements, but it is likely that a form of contract for the supply of professional services may be appropriate. This may include the ZACE contract for professional services or the FIDIC Client/Consultant Model Services Agreement. 5.5.3 Pre-qualification documents If pre-qualification is to be used, the Consultant will be responsible for producing the required documentation and evaluating the returns. The Consultant shall then prepare a Pre-qualification Report including recommendations to Harare Water on which contractors will qualify for possible award of the contract. 5.5.3.1 Specification  Location and limits of the BNR sites;  Security requirements and procedures for access to site;  Handover of the sites including responsibilities for operating equipment;  Facilities to be provided by the Employer;  Facilities to be provided by the Contractor, including accommodation and facilities for staff and the Employer;  Applicable legislation’ including employees’ protection and environmental protection;  Health and safety requirements;  Contractor’s liabilities, including for pollution incidents;  Contractor’s design responsibilities and liabilities;  Particular attention should be paid to defining the required standards for all testing (generally to SAZS standards and in accordance with the requirements of the Environmental Management (Effluent and Solid Waste Disposal) Regulations, 2007);  The requirements for Commissioning shall be specified in detail including responsibility for supply of equipment, responsibility for costs of consumables for initial testing and re-testing where necessary;  A schedule of expected Contractor’s staff inputs;  Training, skills and experience required of the Contractor’s staff;  Requirements for training of Harare Water staff in the operations and maintenance of the BNR plants;  Conditions and procedures for takeover of equipment and instruments by the Employer;  Post-qualification data (if there is no pre-qualification); and  Method of payment (monthly valuation or lump sum with milestones plus procurement and installation); WWDB 005 | Issue | 19 November 2012 Page 4 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 005 OPTIMISATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Optimisation of Sewage Treatment Plants 5.5.3.2 Bill of Quantities The bill of quantities should include either a list of instruments and equipment to be provided and installed by the Contractor, with an item for additional items considered necessary by the Contractor, or provisional sums for supply and installation. 5.5.3.3 Contractor’s documentation The specification shall define the documentation to be provided by the Contractor. In particular it should specify the format and content of the required documents that should include:  Inception Report;  Monthly progress reports summarising project progress and results;  A report on the review of process design and recommendations and outline designs for any modifications to the plants.  An Operations and Maintenance Manual specific to each design of plant.  Project Completion Report. 5.6 Stage 5 – Contract Administration and Inspection The Consultant shall provide suitably qualified and experienced staff to supervise implementation of the project. This shall include actively facilitating, supervising, and inspecting the installation, testing and witnessing commissioning of equipment, witnessing the testing of software and conducting audits of sampling testing and data management. 5.7 Stage 6 – Close Out No additions to the normal duties of the Consultant are anticipated. 5.7.1.1 Consultant’s documentation The Consultant shall deliver the following documentation in addition to the tender documentation issued at Stage 4: All background information collected and results of surveys and investigations conducted; . WWDB 005 | Issue | 19 November 2012 Page 5 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 005 OPTIMISATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Optimisation of Sewage Treatment Plants Appendix A Guidelines Scope of Services WWDB 005 | Issue | 19 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 005 OPTIMISATION ISSUE.DOCX City of Harare – Harare Water 1031794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Draft Project Brief – Optimisation of Sewage Treatment Plants A1 Guideline Scope of Services A1.1 Planning, studies, investigations and Assessments Planning, studies, investigations and Assessments are considered separately from the ‘normal services’ required for engineering projects. The services that may be required are summarised as: These typical services relate to carrying out studies and investigations as well as the preparation and submission of reports embodying preliminary proposals or initial feasibility studies. A1.2 Stage 1– Inception Establish client requirements and preferences assess user needs and options, appointment of necessary consultants, and establish the project brief including project objectives, priorities constraints, assumptions, aspirations and strategies. A1.3 Stage 2 – Concept and Viability (Preliminary Design) Prepare and finalise the project concept in accordance with the brief, including project scope, scale, character, form and function, plus preliminary programme and viability of the project. A1.4 Stage 3– Design Development (Detailed Design) Develop the approved concept to finalise the design, outline specifications, cost plan, financial viability and programme for the project. A1.5 Stage 4 – Documentation and Procurement Prepare procurement and construction documentation, confirm and implement the procurement strategies and procedures for effective and timeous procurement of necessary resources for execution of the project. A1.6 Stage 5 – Contract Administration and Inspection Manage, administer and monitor the construction contracts and processes including preparation and coordination of procedures and documentation to facilitate practical completion of the Works. A1.7 Stage 6 – Close Out Fulfil and complete the project close-out including necessary documentation to facilitate effective completion, handover and operation of the project. WWDB 005 | Issue | 19 November 2012 Page A1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF 005 OPTIMISATION ISSUE.DOCX Appendix O Scope of Work for the appointment of a Geotechnical Specialist  Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist Geotechnical Investigation at Morton Jaffray Issue | 15 November 2012 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 219191 Arup (Pty) Ltd Reg. No. 1994/004081/07 Registered Firm Consulting Engineers South Africa Arup (Pty) Ltd 10 High Street Postnet Suite 93 Private Bag X1 Melrose Arch Johannesburg 2076 Tel 011 218 7600 South Africa www.arup.com Document Verification Job title 1032794 – Technical Assistance for Water and Job number Wastewater Treatment Works in the City of Harare 219191 Document title Scope of Work for the appointment of a File reference Geotechnical Specialist Document ref Geotechnical Investigation at Morton Jaffray Revision Date Filename Geotech Investigation.docx Issue 15 Nov Description Issue 2012 Prepared by Checked by Approved by Name Andy Robertshaw Mark Tindale Signature Filename Description Prepared by Checked by Approved by Name Signature Filename Description Prepared by Checked by Approved by Name Signature Filename Description Prepared by Checked by Approved by Name Signature Issue Document Verification with Document  Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist Contents Page 1 Tender Notice 2 2 Site description 2 3 Problem description 1 3.1 Clarifiers 1 3.2 Settlement 1 3.3 Underground drainage system 2 3.4 Possible Causes 3 4 Scope of the Investigation 3 4.1 Methodology 4 4.2 Phase Two Site Investigation 5 4.3 Visual Assessment of drainage pipeline 6 4.4 Topographic survey requirements 6 4.5 Laboratory testing 6 5 Harare Water to provide 7 5.1 Access 7 6 Pricing Data 7 6.1 Phase One 8 6.2 Phase Two 8 6.3 Phase Three 8 7 Form of Offer 9 8 FORM OF TENDER (APPENDIX) 10 9 APPENDIX - PART 2 (to be completed by Contractor) 11 10 BILL OF QUANTITIES FOR INVESTIGATION 12 10.1 Preamble 12 10.2 Bill of Quantities 16 Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist 1 Tender Notice Harare Water is a semi-autonomous entity within the City of Harare, Zimbabwe, and operates a number of water and waste water works in and around Harare. A primary function of Harare Water is to ensure the provision of potable water to the City of Harare. Harare Water requires the services of competent and experienced professional service providers to undertake the following: A geotechnical investigation at the Morton Jaffray Water Treatment Works into the differential settlement near and around the Clarifier Three. The planning, procurement, execution and reporting on such an appointment would be carried out according to the Geotechnical Division of SAICE Code of Practice for Site Investigations published by the South Africa Institution of Civil Engineering. Note : The Procurement of goods and services for Harare Water is conducted through the Zimbabwe State Procurement Board. 2 Site description Harare Water’s Morton Jaffray Works located immediately downstream of Lake Chivero and alongside the Manyame River, some 30km west of Harare. The works has a design capacity of 614MlD, and is the City of Harare’s primary potable water source. Figure 1 shows the general arrangement of the site. The Works comprises three separate plants, being:  Plant One, constructed in 1953 was a 45 Mld works, treating water abstracted from Lake Chivero and included chemical dosing filtration disinfection and high lift pumps and steel rising main to storage reservoirs in Harare;  Plant One was extended in the late 1950’s to increase production to 115Mld and included an new pumpstation and an additional rising main to Warren Hills outside Harare;  Plant Two, a 227 Mld works, was constructed 1976 comprised a new mixing chamber, chemical dosing, three pulsator clarifiers, a filter gallery, extended pumping and rising main;  Plant Three, a 227 Mld works constructed 1994, effectively duplicated Plant Two; and allowed for treatment of water from the Manyame Dam, delivered through a tunnel and lifted to the works by the Darwendale pumps. A further three pulsator clarifiers, an extension to the filter gallery, extended pumping and rising main were constructed. Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist Figure 1 Morton Jaffray General Arrangement Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist 3 Problem description 3.1 Clarifiers Photograph 1 shows a view eastwards along the northern edge of the Plant Three clarifiers, while Photograph 2 shows the effect of differential settlement on the Plant Three dosing channels. Photograph 1 Clarifier C13’s flocculent dosing Photograph 2 Effect of differential settlement channel on dosing channels 3.2 Settlement Differential settlement has occurred at specific locations within the Morton Jaffray water treatment works, and is particularly obvious at the Plant Three clarifiers, Clarifiers C11-C13 shown in Figure One. These clarifiers are large reinforced water retaining structures and are approximately 135 m long and 33m wide. The dosing channels run the full length (viz. 135m) of the Plant Three clarifier on the northern end. The result of the noted settlement has Photograph 3 Displacement along the flocculation channel been movement of some parts of the structure relative to others. Photograph 3 Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 1 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist shows this displacement, which is both horizontal and vertical. As can be seen the movement is significant. In some places the water proofing plastic membrane (Photograph 4) installed across the construction joints has been stretched to the point of failure. It is the consequential damage that may occur in the event that the settlement continues that is of concern. Photograph 4 Damage to water bar across construction joint 3.3 Underground drainage system A under structure drainage system was built (1976) as part of the Plant Two expansion. The system, which was designed to accommodate the Plant Three (1994) expansion, connects to a drainage pipeline that is approximately 4m below Photograph 5 View looking north along western face of clarifier C13 and from vertically above the construction joint ground level. The system not only collects under structure drain water, but also is used to convey the water pumped out of the subterranean Darwendale pumpstation sumps. Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 2 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist The drainage pipeline runs along the northern face, and parallel to the Clarifiers, skirting to the west of Plant Three and draining to the Manyame River. Concrete ring type man-holes are used to access the system, and have been placed at grade and direction changes to the pipeline. An access man-hole is located immediately adjacent to the northwest corner of Plant Three’s Clarifier C13 (see Photograph 6). The man- hole appears to have been built slightly out of place, with no clearance between pipeline and clarifier. It is suspected that leaks from the drainage system may have saturated the sub-soil below the Clarifier foundations and thus be one cause of the differential settlement described above. It is to Photograph 6 Concrete ring drainage man-hole at identify the cause of the northwest corner of clarifier C13 settlement that is one of the focuses of this investigation. 3.4 Possible Causes The displacements of the wall and base of the clarifier structure may be due to various potential conditions:- Ground settlement due to either Long term consolidation of natural soft soil layer beneath the clarifier structure; Inadequate compaction of natural or backfilled foundation bearing soil during construction. Possible erosion beneath the foundation soil due to running water either from: natural flowing groundwater; continuous discharge of leaking water through cracks in the clarifier structure directly into the ground. 4 Scope of the Investigation The purpose of the geotechnical investigation is to confirm to investigate the cause of the displacement and to recommend actions needed to mitigate the problem. The investigation shall take place in phases: Phase One will comprise a site inspection, data gathering and a desktop report. The report should describe the required on site detailed investigations to carried out as Phase Two; Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 3 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist Phase Two will comprise the investigations recommended and agreed by Harare Water. The investigations will include a topographic survey of Clarifier Three and surrounds, a remote camera visual assessment of drainage pipeline, test pits, observation wells, boreholes, and laboratory tests for long term consolidation, Modified Proctor Density Tests, etc. The output form Phase Two would be recommendations for mitigation and repair ; Phase Three will be the geotechnical design of the mitigation recommended in the Phase Two report. 4.1 Methodology A method statement shall be prepared in which the Professional Service Provider that shall:  Identify the structure and composition of the team, main disciplines involves, key staff members and expert responsibilities, support and site staff. An organisation chart showing the structure of the team should be attached;  Include paragraph cv’s of key staff showing qualifications and experience;  Detail the technical approach to be followed;  Attach a preliminary schedule reflecting the proposed sequence for each of the three phases and timing of the execution of the investigation, with milestones for deliverables and payment;  Detail the implementation of the investigation, including procurement of the plant and equipment needed to dig the test pits, drill the boreholes,  List assumptions made and costs not included in financial proposal that are for Harare Water’s account. 4.1.1 Phase One: Site Inspection The PSP shall allow for a one day site inspection to:  Familiarise himself with the site conditions and the layout of the Works;  Inspect the settlement that has occurred,  Identify the sites for test pits and arrange for the manual excavation to a depth of 1.2m of these;  Delineate the area in which Harare Water shall undertake the proving for existing services;  Discuss with the operational staff the arrangements for a site camp, access and overnight arrangements for plant and equipment;  Collect from Harare Water copies of relevant drawings,  Identify any further inspections or investigations. 4.1.2 Phase One: Deliverables The deliverable shall be a detailed methodology and schedule for the Phase Two investigation. Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 4 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist 4.2 Phase Two Site Investigation Manually excavated inspection pits to 1.2m depth adjacent to the affected areas of the clarifiers to determine:  the nature of the foundations and foundations soils;  to obtain representative sample material from the foundation soils for relevant laboratory testing. Should this method prove inconclusive, these pits could be extended further by mechanical excavation using a TLB to 3.0m depth or refusal to further examine the underlying subsoil and natural or abnormal groundwater conditions. Dynamic cone penetrometer tests should be carried put to determine the consistency of the soils at a shallow to moderate depth below the site. Noted all inspection pits should be backfilled, once the profile conducted and representative samples collected. The backfill shall be for the material removed during exaction, and where necessary, a suitable inert in-situ material, and appropriately compacted. 4.2.1 Suggested approach to determination of settlement To confirm if the cause is ground settlement due to long term consolidation of natural soft soil layer beneath the clarifier structure it is suggested that boreholes be sunk at the areas of observed structural settlement up to the depth of hard ground (Standard penetration blow count > 50 blows/0.3m). The borehole logs will provide the subsoil stratification. The grading and natural density of the soils should be determined from undisturbed samples. If soft clays are identified, 1-D consolidation tests would be necessary to obtain the Maximum Past Pre- consolidation Pressure for determining the Over-consolidation Ratio. OCR <1 will indicate that the soft clay is still consolidating under the weight of the clarifier structure since its construction. To confirm if inadequate compaction of natural or backfilled foundation bearing soil during construction is the cause, .the soil just beneath the level of the clarifier base shall be collected and re-compacted under different moisture contents using the Modified Proctor Density Test to determine the compaction curve. This will provide an idea of how well the foundation soil immediately beneath the structure had been compacted. 4.2.2 Suggested approach to determination of groundwater flow The purpose of the groundwater flow component of the investigation is to find out where the groundwater is located and whether there is a flow gradient that would be sufficient to cause soil erosion beneath the clarifier structure. It is suggested that eight observation wells be installed around the clarifier structure, one each at the four corners and two spread out evenly along the 135m length of the clarifier on each side. The top of the wells shall be surveyed to fix the reference elevation level and water levels below this datum shall be monitored over say six to twelve months to capture any seasonal patterns. A contour of the Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 5 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist groundwater elevations over different time periods can be studied to reveal any preferential flow patterns that may adversely impact the clarifier structure. To confirm whether there is a continuous discharge of leaking water through cracks in the clarifier structure directly into the ground it is suggested that test pits be dug at the locations adjacent to the observed structural movements and at discharge manholes, using proper shoring as necessary so as not to further aggravate the situation. The purpose is to uncover any water leakage through cracks in the clarifier structure that has discharged directly into the soil below. It would be useful to obtain the flow rate of the discharge by timing the volume of water collected in a given time interval. This will provide an idea of the potential erodability of the foundation soil. 4.3 Visual Assessment of drainage pipeline The use of a self-propelled remote control camera inspection technique to provide in-situ visual assessment of the drainage system will be required, and a special sub-contractor to undertake such an assessment will be required. 4.4 Topographic survey requirements Survey the clarifier and surrounds to provide a baseline survey of Plant Three to an accuracy of 0.001m (1mm). The spots shots should be not more than 15m apart and be sufficient to allow the drafting of a contour plan with 0.5m contour intervals. Two project survey Bench Marks (Control Points) shall be established in such locations as will allow ease of both reference and of construction. The Surveyor is to use the Zimbabwean accepted coordinate system, and the extent of the survey shall be sufficient to show the topography, all existing buildings, roads, structures, services and pipelines. The survey shall note the drainage pipeline and associated manholes, the water domestic supply pipelines and standpipes, power cables, light poles and other services. The survey data shall be processed and the resultant information be made available in both electronic format and three copies of A1 scale paper prints. 4.5 Laboratory testing The PSP shall identify a suitable soil testing laboratory and arrange for the testing of the samples. Laboratory testing is likely to comprise at least the following:  Full grading analysis including Atterberg Limits and hydrometer to 2 micron size;  Moisture content;  Oedometer testing on undisturbed samples. Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 6 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist 5 Harare Water to provide 5.1 Access Harare Water shall prior to the team arriving on site, arrange the access needed for the Professional Service Provider’s team to access the Morton Jaffray site to:  undertake the site inspections and interview Harare Water personnel;  conduct the topographic and cadastral surveys;  copy any necessary documentation and drawings provided by Harare Water;  take photographs of the structures;  dig trial holes, drill the boreholes, remove samples for laboratory investigation, and expose such services as are necessary services.  Bring onto site such plant and equipment as needed to undertake the investigation. Note: The professional Service Provider shall provide Harare Water with the all documentation and information; required by Harare Water to obtain access permission; two weeks prior to any such visit. 5.1.1 Drawings and proving of existing services Harare Water is to obtain as built drawings of the Clarifiers, showing the general arrangements, all above ground and below ground services, the drainage systems, manholes, power supply cables, electric light poles and any other service which may be damaged in undertaking this investigation. Proving of all below ground services shall be undertaken by Harare Water within the area indicated by the PSP following the completion of Phase One, and immediately prior to the initiation of Phase Two. PSP cannot be held responsible for damage to services or the consequences thereof if these were not shown to them beforehand. Public indemnity insurance is required to cover Harare Water in the event of accidental damage to a service. 5.1.2 Security The need for security for the field team and equipment shall be determined by Harare Water and shall be for Harare Water’s account. 6 Pricing Data The Preamble to the bill of quantities describes what the costing is to include for, and what follows is a summary of the work required. The cost shall indicate the following. Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 7 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist 6.1 Phase One The cost to include for the engineering geologist, visas, flights to and from Zimbabwe, subsistence, accommodation and travel for the three day site visit. A Provision Sum of USD1000 for the duplication of necessary drawings and documents is included in this phase. 6.2 Phase Two The cost to include for the costs of the engineering geologist and two site technicians, visas, flights to and from Zimbabwe, food, transport (including transport of DCP equipment) and accommodation for the full duration of the site visit. The digging of test pits should cover hire of TLB to dig 8 number test pits, backfill and re-compact. The borehole cost to include drilling of 8 number boreholes to 5m, core recovery, sampling and analysis. 24 lab tests have been allowed for, and the sum tendered shall include for transport of the samples to the laboratory; the cost of the tests; reports on the findings, and other items as the PSP indicates may be required. The topographic survey and remote camera inspection costs tendered shall be a sum item covering all costs to perform the entire task, together with the deliverables of a survey drawing and video record of the pipe inspection. 6.3 Phase Three The cost is to include for preparation of design, drawings, and all documentation. Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 8 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist 7 Form of Offer To: The Town Clerk City of Harare PO Box 990 Causeway Harare Zimbabwe To Whom It May Concern, Having examined the Drawings, Conditions of Contract, Specifications and Bill of Quantities for; The execution of the Geotechnical investigation at the Morton Jaffray Water Treatment Works into the differential settlement near and around the Clarifier Three; we offer to carry out the whole of the said Investigation in conformity with the said Drawings, Conditions of Contract, Specifications and Bill of Quantities for such sum of ……………………………………………..USD, net of any taxes. We undertake to complete and deliver the whole of the Site Operations and Investigation comprised in the Contract within the time stated in the Appendix hereto. Unless and until a formal Agreement is prepared and executed this Tender together with your written acceptance thereof, shall constitute a binding Contract between us. We understand that you are not bound to accept the lowest or any tender you may receive. Yours faithfully, Signature ........................................................................ Address ........................................................................ ........................................................................ ........................................................................ Date ........................................................................ Encl. one set of tender documents. Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 9 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist 8 FORM OF TENDER (APPENDIX) APPENDIX - PART 1 (to be completed prior to the invitation of Tenders) Name of the Employer: City of Harare, PO Box 990, Causeway, Harare Name of the Investigation Supervisor Arup Zimbabwe, Astra Park, Cnr Ridgeway North and Northend Roads, Borrowdale, Harare Defects Correction Period [4] Weeks Form of Agreement Required/Not required Performance Bond Not required Minimum amount of third party insurance (persons and property) for each and every occurrence USD 10 000.00 Commencement Date Schedule of entire assignment is to be submitted within 2 weeks from date of contract becoming effective. Time for Completion calculated from the Commencement Date Phase One 2 Weeks Phase Two 4 Weeks Phase Three 8 Weeks Rate of retention 0% Limit of retention 0% Period For All Approvals to be 1 Week for date of issue to Harare Water In the event the Party’s cannot agree, an Arbitrator shall be appointed by The Association of Arbitrators, South Africa. Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 10 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist 9 APPENDIX - PART 2 (to be completed by Contractor) Insurance Policy Excesses Insurance of the Investigation USD........... Third party (property damage) USD .......... Time for completion calculated from the Commencement Date Phase One …. Weeks Phase Two …. Weeks Phase Three …..Weeks 4. Sub-contractors to be used by the Contractor ........................................................................................................................ 5. Percentage(s) for adjustment of PC sums ……%. Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 11 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist 10 BILL OF QUANTITIES FOR INVESTIGATION 10.1 Preamble 1. In this Bill of Quantities the sub-headings and item descriptions identify the work covered by the respective items. The exact nature and extent of the work to be performed shall be ascertained by reference to the Conditions of Contract, the Specification and the Schedules and Appendices to the Specification, as appropriate. The rates and prices entered in the Bill of Quantities shall be deemed to be the full inclusive value of the work covered by the several items, including the following unless stated otherwise: a. Contract management and superintendence, labour and all costs in connection therewith b. the supply of materials, goods, storage, facilities and services and all costs in connection therewith, including wastage and delivery to site c. plant and all costs in connection therewith d. fixing, erecting and installing or placing of materials and goods in position e. all temporary works f. all general obligations, requirements, liabilities and risks involved in the execution of the investigation as set forth or implied in the documents on which the tender is based g. establishment charges, overheads and profit h. bringing plant and sampling, in situ testing and monitoring equipment to the site of each exploratory hole, erecting, dismantling and removing on completion i. on completion, removal of all equipment and services from site and disposal of waste material. 2. Unless identified as Not required, all items in section A of the Bill of Quantities (general items, provisional services and additional items), and also all items in subsequent sections against which quantities are entered shall be priced. 3. If lump-sum items are not required by the Contractor, this shall be stated against the rate item in the Bill of Quantities and USD0.00 entered in the amount. Where rates are not priced they shall have USD0.00 placed against them and USD0.00 entered in the amount. 4. When full- or part-time professional attendance on site is required, this shall normally be paid for under the item in the Bill of Quantities. Unless otherwise detailed in Schedule S1.8.2, the on-site professional attendance services provided by the technical staff shall comprise the Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 12 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist technical supervision of site activities, site liaison, logistics, logging, in situ testing and sampling, photography and the preparation of daily records and preliminary logs (except where any of the above activities are carried out by site operatives and boring/drilling operatives). When individuals are not carrying out their specific duties or are otherwise away from site, then daily rates will not apply and these costs will be deemed to be covered under general items. 5. The rate entered under Item A3 shall include for the provision of any additional PPE, ground surface protection measures, additional welfare and hygiene facilities and plant and equipment decontamination facilities required as a direct result of the contamination or hazard(s) detailed in Schedule S1.8.4 and/or S1.8.6. 6. The item for photographs shall allow for the standing time of associated plant,, three copies of each prints and bound volume or electronic equivalents. 7. Rates for moving plant and equipment to the site of each exploratory hole shall allow for the formation of access routes and working areas and making good avoidable damage to access routes and working areas on completion. 8. The rates for moving rotary drilling plant to the site of each hole shall include for setting up over a previously formed borehole, including for any additional costs arising from pulling casings left in the ground or providing temporary casings. 9. Payment for forming exploratory holes shall be based on: a. full thickness of strata investigated and described in accordance with the Specification b. depths measured from ground level c. depth measured from original ground level where an inspection pit has been excavated d. that part of a drill hole below the bottom of a borehole where a drill hole has been ordered to continue from the bottom of a borehole e. core recovery of at least 90% in any core run, unless the Investigation Supervisor is satisfied it cannot be achieved f. volume calculated as measured length times measured depth times specified width for trial and observation trenches. 10. Rates for forming exploratory holes shall allow for: a. temporary casing installation, where necessary, and removal b. dealing with surface water c. backfilling with inert waste material or drilling excess d. taking information and supply of daily record for works carried by site operatives Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 13 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist e. additional site supervision of non-qualified operatives. 11. Standing time shall be measured as the duration of time for which plant, equipment and personnel are standing on the instruction of the Investigation Supervisor. The rates for standing time shall include for: a. plant equipment and personnel b. consequential costs c. changes in the programme of working d. recording information and preparing daily record. 12. The rates for daily provision of dynamic sampling and probing, hand auguring and pitting and trenching crews and equipment at locations as directed by the Investigation Supervisor shall allow for compliance with the requirements of the Contract, including preparation of records (unless the Investigation Supervisor takes responsibility for the logging and preparation of records). 13. The rates for sampling shall allow for the standing time of associated plant. The rates for sampling shall also include for the costs of the sample containers and transport and storage of the samples up to the specified time limits. 14. The rates for in situ testing shall allow for the standing time of associated plant and for interpretation and presentation of the results on preliminary logs/exploratory hole logs or on separate agreed report forms using the same dates of presentation as the exploratory hole to which they refer. Where in situ testing is paid for on an hourly basis, the time measured shall be the actual time taken to carry out the test in accordance with the Investigation Supervisor’s instruction and/or the Specification but excluding the time taken to erect and dismantle test equipment where this is itemised separately. 15. The rates for cone penetration tests shall allow for provision of daily records and for interpretation and presentation of the results on agreed report forms/exploratory hole logs. For the seismic cone, the recorded and presented data shall include the specified CPT data recorded between seismic test depths. The rates for dynamic probing shall allow for undertaking and reporting torque measurements at the prescribed vertical intervals. 16. The rates for installation of instruments shall allow for: a. clearing and keeping the hole free of unwanted materials b. all costs associated with equipment, installation, specified seals, surround and backfill materials excluding backfill below the instrument c. proving correct functioning d. delays due to installations, including the setting time for grout Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 14 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist e. recording information and preparing daily record and additional reports. 17. The rates for monitoring and sampling of installations during the fieldwork period shall allow for: a. purging and dealing with disposal of recovered water b. all costs associated with consumables and provision of data recording equipment to site c. proving correct calibration and recalibration d. recording information, preparing, updating and submitting additional reports successively and at the completion of monitoring, including notification of any unexpected readings and/or variation in readings e. delays due to interruptions of other site activities. The rates for monitoring and sampling of installations during the post- fieldwork period shall allow for: a. items (a)–(d) above b. all costs associated with remobilising the appropriate (number and experience) staff to site and all travelling and accommodation expenses The rates for recording of water level, ground gas or other monitoring measurements shall allow for notices of re-entry to the Investigation Supervisor, owners or occupiers affected by the location or access route. Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 15 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX Harare Water 1032794 – Technical Assistance for Water and Wastewater Treatment Works in the City of Harare Scope of Work for the appointment of a Geotechnical Specialist 10.2 Bill of Quantities Number Description Unit of Quantity Rate Amount measure USD(excl. VAT) 1.0 Phase One 1.1 Attend on site, Sum 1 inspect works and settlement, arrange site investigations, and surveys, prepare report 1.2 Travel Sum 1 1.3 Accommodation Days 3 1.4 Copying documents Prov Sum 1 1000.00 1000.00 Sub- Total 1 2.0 Phase Two 2.1 Undertake Sum 1 Geotechnical Investigation 2.2 Topographic Survey Sum 1 2.3 Remote Camera Sum 1 Inspection 2.4 Excavation of Test Number 8 pits 2.5 Boreholes to 5m Number 8 2.6 Laboratory tests Number 24 2.7 Travel Sum 1 2.8 Accommodation Days 15 2.9 Report Sum 1 Sub- Total 2 3.0 Phase Three 3 Undertake design of Sum 1 mitigation, draft design drawings, and design report Total All Phases Geotechnical Investigation at Morton Jaffray | Issue | 15 November 2012 Page 16 F:\PROJECTS - INFRASTRUCTURE\INFRASTRUCTURE - REAL JOBS\HARARE TA\DESIGN BRIEF MJ GEOTECH INVESTIGATION ISSUE.DOCX