R98-05 AUTHORIZING THE EXECUTION OF AN AGREEMENT

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��• Ec7 a c V 7s '/ILINO�Y December 30, 1997 PUBLIC WORKS MEMORANDUM N0. 97 - 411 MEMORANDiJM TO: Honorable Mayor and City Council FROM: James L. Williams, Jr., City Manager Bruce A. McNabb, Director of Public W rks j� Stephen P. Swanson, City Engineer `�j John A. Smith, Water Production Manager SUBJECT: South Water Treatment Plant Intakes Study The City of Decatur's South Water Treatment Plant (SWTP) was completed in 1988 to provide a treatment capacity of 36 million gallons per day (mgd) of water and is capable of being expanded to a 54 mgd plant. The raw water for the SWTP is piped from two intakes in Lake Decatur. The SWTP, on an average, produces approxirriately 80 percent of the City's treated water and the remaining amount is produced by the City's North Water Treatment Plant, which produces 8 mgd. The SWTP has and will continue to play a critical role in meeting the City's water needs. The quality of the water in the Lake and the ability to draw water from the Lake are basic to the ability of the SWTP to meet the City's supply needs. The City is in the process of undertaking watershed management studies and programs for nitrate and sediment control as they impact the Lake's water quality. However, on a more limited scale, the water quality at the SWTP intakes is susceptible to spills occurring on the roadways adjacent to or over the Lake. These roadways carry considerable traffic including bulk transport trucks. There could be a very limited time to contain or control a spill from an accident before the material enters the Lake and threatens the City's raw water supply. This and other related concerns need to be evaluated to aid the City in deternuning how best to further develop preventive measures and programs to ensure the protection of the water supply at the SWTP intakes.