R96-178 ACCEPTING THE PROPOSAL AND AUTHORIZING AMENDMENT TO AGREEMENT

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, i Mr. Bruce McNabb December 9, 1996 Page 3 - a phone call to the Illinois Environmental Protection Agency (IEPA) to request available water quality data for Lake Shelbyville and to determine IEPA's position relative to use of the lake as a source of water for Decatur; and - a phone call to the Lincoln-Prairie Water Company to obtain information on the utility's organization and plans for operation and to discuss the potential benefits of a regional water supply project based on use of Lake Shelbyville water for users including the City of Decatur. Results of these contacts will be documented in telephone logs and included as an appendix to the study letter report. These materials will be structured to summarize the basic features of a Lake Shelbyville supply alternative in more detail than was developed for the Water Resources/Storage/Production Study and to provide a good understanding of the permitting requirements, general approval procedures, and relative timing of actions that might be associated with the alternative. Task 2 - Formulation of Lake Shelbvville Su�lv Options. Based on the information collected as part of Task 1,up to three possible scenarios for the use of Lake Shelbyville as a source of additional water supply capacity for Decatur will be developed(in addition to the base case scenario presented in the Water Resources/Storage/Production Study). Scenarios may include: - operation of Lake Shelbyville as a source of raw water for supplemental supply to Decatur (raw water discharge to Lake Decatur via Finley Creek or extended open channel); - operation of Lake Shelbyville as a source of raw water for supplemental supply and/or water quality blending to Decatur(raw water conveyed to Decatur via pipeline); or - operation of intake, pumping and treatment facilities at Lake Shelbyville for the supply of finished water to the Decatur water distribution system either as a dedicated system or as part of a regional water supply system. Various operating strategies(90 days per year,200 days per year,continuous)will be considered in the development of the strategies to be evaluated. Harza/BWC will compile a proposed list of scenarios for evaluation for review with City staff. The final set of four scenarios to be evaluated (base case plus three new alternatives)will be selected by staff. Basic information related to each of the selected scenarios will be compiled as the basis for their evaluation. Key features will include estimates of supplemental supply capacity under drought conditions, basic mapping of the water conveyance route (including Lake Shelbyville intake location and proposed delivery connection points to Decatur), and expected quality of the water to be delivered to Decatur. The intent of this task will be to identify alternative strategies that are fundamentally sound and provide a basic concept that enables the necessary implementation costs to be estimated. However, HES BMN_I111 WPD JPVhj-2 5796G/961111/961209