South East Queensland Regional Water Supply Strategy Desk Top Review and TOR Development Consultancy Desktop Review of Identified Dam and Weir Sites
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Appendix A Initial Scoping Report 41/14840/332913 Bulk Infrastructure Task Group BSI04 Desk Top Review of Identified Dam and Weir Sites South East Queensland Regional Water Supply Strategy Desk Top Review and TOR Development Consultancy Desktop Review of Identified Dam and Weir Sites Initial Scoping Report to the Bulk Supply Infrastructure Task Group November 2005 Contents 1. Introduction 1 1.1 Background 1 1.2 Objective of Part 3 1 2. Proposed Scope of Works 3 2.1 BSI 04 Desk Top Review of Identified Dam and Weir Sites 3 3. Identification and Collation of Sites/Projects 5 3.1 Sources of Information 5 3.2 Dam and Weir Water Supply Projects 6 3.3 Cost per ML/a Yield 7 3.4 Recommended Sites for Further Review 8 4. Identification of Contributions from BSI Task Group 11 5. Proposed Timings 12 5.1 What can be started now? 12 5.2 Proposed Schedule 12 Table Index Table 1 Dams Returned to Service 8 Table 2 Bulk Water Supply Projects Recommended for Further Evaluation 9 Figure Index Figure 1A Approximate Dam and Weir Locations - Southern South East Queensland Figure 1B Approximate Dam and Weir Locations - Northern South East Queensland Appendices 27th January Workshop – Summary of Findings Summary of Project Evaluation Considerations for Bulk Water Supply Projects 41/14840/333302 South East Queensland Regional Water Supply Strategy Bulk Supply Infrastructure Task Group Desk Top Review and TOR Development Consultancy 1. Introduction 1.1 Background The Terms of Reference (TOR) for the “South East Queensland Regional Water Supply Strategic Project Bulk Infrastructure Task Group” (RWSS) require a desktop review and TOR development (BSI-04) be undertaken in four parts as follows: Part 1 – Review of Gold Coast Water Supply Options; Part 2 – Review of Other Augmentation Planning; Part 3 – Desktop Review of Identified Dam and Weir Sites; and, Part 4 – Preparation of TORs for Further Consultancies. A sub-requirement of Part 3 of the consultancy is the preparation of scoping reports indicating: The proposed scope of work for this task; A refinement of the cost estimates for the task (exclusive of in-kind work by the Bulk Supply Infrastructure Task Group); A proposed methodology for screening dam and weir sites with a view to updating cost estimates only for those projects worthy of further analysis; Identification of any work contribution required from the BSI Task Group; and, A proposed schedule for the work for this task giving regard to timing of outputs required to other BSI Tasks and to other task groups. An initial scoping report is required under Part 3 summarising infrastructure options identified, with recommendations regarding which projects are to be included for further analysis as part of the desk top study. This report constitutes the initial scoping report. Following BSI Task Group approval of the options to be included for further review as outlined in the initial scoping report, a further scoping report is required which refines the scope and proposes a work schedule for the specific options to be further considered in the desk top review. 1.2 Objective of Part 3 The overall objective for Part 3 of the consultancy is to address the work required under Task BSI04 “The Desk Top Review of Identified Dam and Weir Sites” as outlined in the Bulk Supply Infrastructure Task Group Scoping Paper, which was attached to the brief for this consultancy. Consequently, the consultant is to: Acquire and review existing information on previous investigations; and, Prepare and submit to the Project Officer, a Report (the BSI04 Report) summarising the Infrastructure Options identified from a review of the existing reports and information, with recommendations on which warrant further 41/14840/333302 South East Queensland Regional Water Supply Strategy 1 Bulk Supply Infrastructure Task Group Desk Top Review and TOR Development Consultancy consideration, and identification of the further investigation required to firm up the information on these sites. The initial scoping report is the first report in a series of reports with the overall objective to: Identify possible infrastructure options to improve water supply including: – New dams and weirs; – Existing dams or weirs that could be raised; – The associated delivery infrastructure; and, Determine which of the identified infrastructure options warrants detailed investigations and eliminate all others from further consideration. Each of the previous studies is to be evaluated to identify any major gaps in information on aspects such as environmental impact, cultural heritage or foundation conditions giving particular attention to the identification of potential “show stoppers”. A report (the BSI04 Report) is to be submitted to the Project Officer incorporating the following: The costs associated with the development of selected sites to a range of capacities, including land acquisitions and modifications to infrastructure such as roads and powerlines. The costs are also to be shown in schedules including quantities, unit rates and allowances for overheads and contingencies. Plans showing arrangements of structures, relocations, resumption areas etc are also to be provided; Recommendations on further studies (including costs and timelines) necessary to assess potential “show stoppers”. These recommendations will also be provided progressively in a series of interim reports and will lead to the preparation of TORs for work under BSI 05; Recommendations on the infrastructure necessary to connect the storages to the regional network (identified in broad terms) together with preliminary cost estimates of pipelines and water treatment; Recommendations on the infrastructure necessary to connect the storages to the regional network in broad terms together with preliminary cost estimates of pipelines and water treatment; and, TORs for BSI 05 provided progressively. In addition an oral presentation of the findings will be made to the Bulk Supply Infrastructure Task Group and the Strategy Management Group on completion of the task. 41/14840/333302 South East Queensland Regional Water Supply Strategy 2 Bulk Supply Infrastructure Task Group Desk Top Review and TOR Development Consultancy 2. Proposed Scope of Works 2.1 BSI 04 Desk Top Review of Identified Dam and Weir Sites Subject to approval of the Initial Scoping Report by the BSI Task Group, a more detailed review of the existing Investigation Reports and Preliminary Designs will be undertaken and the costs will be updated on a common basis. This may require some new desktop preliminary design where modification from previous arrangements is desirable, or where existing information was insufficient. Some desk top preliminary design may also be required for the delivery infrastructure on an individual basis recognising that water demand and points of delivery will not be fully understood. After screening to determine the sites with the greatest potential, a range of capacities will be assessed to determine the upper limit for development at each of the sites. Whilst this upper limit may result in a higher cost per megalitre than an alternative the marginal cost may be less than the marginal cost of the next alternative. At least two capacities are to be investigated at each site: the nominated capacity and the upper limit. The tasks to be undertaken include: Identify all the sites to be considered in the desktop review. The BSI Task Group Scoping Document attached to the brief for this consultancy suggested that this is likely to amount to five or six new dam sites, three potential raisings and up to four weir sites, though the brief itself and review of existing reports to date have suggested an increased number of sites will need to be considered; A review of the infrastructure projects nominated by the Steering Committee Workshop 27th January 05; Review of the existing documents on previous investigations including the cost estimates and identify shortfalls; Review any previous assessments of environmental and cultural heritage impacts. Carry out additional desktop studies where appropriate in order to develop an appreciation of whether potential impacts may affect the likelihood of the proposal proceeding and identify those sites unlikely to be developed due to social or environmental impacts; Prepare updated cost estimates based on the available information and form an appreciation of the accuracy of the estimates, for those projects that might be considered further in the development of the RWSS; Identify in broad terms the infrastructure necessary to connect the storages to the regional network; Prepare preliminary estimates of the costs of this connecting infrastructure and water treatment; 41/14840/333302 South East Queensland Regional Water Supply Strategy 3 Bulk Supply Infrastructure Task Group Desk Top Review and TOR Development Consultancy For competing options, for example, alternative weir sites on a river or alternative pipeline routes, determine which is preferable considering cost, supply and impact criteria; Prepare a list of options that appear to be feasible and preferred; Prepare, following consultation with the BSI Task Group, for each site included in this program, a schedule of additional (pre-feasibility level) studies required to confirm that the project warrants detailed investigation, including estimated costs of the studies; Prepare a risk management assessment for each site/project in the context of it being struck off the list or included for further consideration; 41/14840/333302 South East Queensland Regional Water Supply Strategy 4 Bulk Supply Infrastructure Task Group Desk Top Review and TOR Development Consultancy 3. Identification and Collation of Sites/Projects 3.1 Sources of Information A review of the following documents indicated that there have been a large number of dam and weir sites considered to supplement the raw water supply in the South East Queensland region. The documents reviewed included: 1. JWP, “Future Water Source Options for the Sunshine Coast” Table 16.1(draft), Aquagen, July 2005; 2. 27th January 2005 RWSS Steering Committee Workshop minutes; 3. Sunwater, “Water Supply Study of the Upper Mary Valley – Security of Supply”, August 2004; 4.