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i � <br /> I' <br /> ` <br /> ''/, <br /> Decatur <br /> ■ I L L I N O I S ■ <br /> December 1, 2000 <br /> WATER MANAGEMENT MEMORANDUM <br /> NO. 2000 - 13 <br /> MEMORANDUM TO: Honarable Mayor and City Council <br /> FROM: Steve Garman, City Manager <br /> John A. Smith, Assistant City Manager of Public Services <br /> Keith D. Alexander, Director of Water Management /� <br /> William A. Ratekin, Assistant City Engineer G!/g'/Z <br /> SUBJECT: DeWitt County Water Wellfield Follow-up Study <br /> In 1998, the City contracted with Layne Geosciences, Inc. to develop a groundwater <br /> withdrawal model of the DeWitt Well Field and the underlying Mahomet Aquifer after <br /> conducting a 30-day run of the wells. A copy of the executive summary from the Layne report is <br /> attached. <br /> Starting in December 1999, the City ran the DeWitt Well Field for nearly 90 days due to <br /> low levels in Lake Decatur. Staff received numerous complaints of private well outages from <br /> areas that were not previously identified in the Layne report. Staff were also concerned with the <br /> faster-than-anticipated lowering of the Mahomet Aquifer groundwater levels during the 90-day <br /> run. • <br /> Due to these discoveries, and the fact that the DeWitt Well Field is the City's water <br /> supply during drought conditions, Staff are recommending that a follow-up study be undertaken. <br /> Accurate documentation of the capacity and operational effects of the DeWitt Well Field is <br /> critical information needed to manage the City's water supply. �I <br /> The most logical organization to do the study is the Illinois State Water Survey, the I <br /> official water research agency of the State of Illinois. Enclosed is a copy of the proposed contract , <br /> with the Illinois State Water Survey, at a very reasonable cost of$8,284.00. Funding is available <br /> in the Water Capital Fund. <br /> _ , <br />