R96-178 ACCEPTING THE PROPOSAL AND AUTHORIZING AMENDMENT TO AGREEMENT

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� c = Mr. Bruce McNabb December 9, 1996 Page 4 the level of technical detail considered in the evaluation will be limited to that judged necessary for an effective planning level analysis of the alternatives. Task 3 -Evaluation of Alternative Scenario Costs. The capital and operating and maintenance costs associated with each of the alternative scenarios defined as a result of Task 2 will be evaluated in order to assess their economic feasibility. The cost analysis will be based on a conceptual analysis of life cycle costs for water supply, water quality management, water production and water distribution improvements required to meet City water needs through the year 2015 (raw water requirement of approximately 50.9 mgd). This corresponds roughly to the maximum combined supply that could be provided to Decatur by a combined Lake Decatur/Lake Shelbyville interconnection system. The goal of the cost analysis will be to define conceptual estimates of total and incremental (per mgd of additional yield) present worth costs for comparison with the alternatives presented in the Water Resources/Storage/Production Study. As part of the cost evaluation,the costs and benefits associated with various operating strategies (90 day,200 day,continuous)will also be examined. Results of the analysis will be presented in tabular ' format so as to be easily understood. Results of the cost analysis will also be examined to identify '�, project components to which the life cycle cost computations are particularly sensitive. The cost analysis will build upon the analyses performed in conjunction with the Water Resources/ Storage/Production Study. However,unexplained references to the previous study will be avoided so that the Lake Shelbyville analysis can be readily understood as a stand-alone document. Task 4-Preparation of Ana1, siY s Report. The Harza team will present the results of its study to the City in the form of a brief technical report supplemented with appendices including documentation of additional data collection efforts (Task 1) and the cost analyses performed (Task 3). Five draft copies of the report will be provided to the City for review. Following review and discussion of staff's comments on the draft report, ten copies of a final report will be prepared and submitted. Per the City's request,the report will be prepared without special or color graphics to facilitate future prepazation of additional copies by the City. Proposed Schedule We recognize that the City wants to finalize its evaluation of these issues as soon as possible given the aggressive schedule of water system improvement presently in place. As such, we are prepared to move forward with our analysis immediately following your authorization to proceed. We anticipate that a draft report summarizing the results of our analysis can be provided to the City within eight(8)weeks following authorization to proceed. The final report will be provided to the City within two (2) weeks following our receipt of comments on the draft. HES BMN_i ll I.WPD JPV/y-2 5796G/96I ll 1/961209