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oF'DFc <br /> ~ 9G <br /> V A <br /> '��9 <br /> '/(L I N O�S� <br /> October 25, 1999 <br />� PUBLIC WORKS MEMORANDUM <br /> NO. 99 - 63 <br /> MEMORANDUM TO: Honorable Mayor and City Council <br /> FROM: Steve Garman, City Manager <br /> Bruce A. McNabb, P. E., Director of Public Works <br /> Keith D. Alexander, Lake Manager <br /> SUBJECT: Lake Decatur Basin 6 Sediment Survey Proposal <br /> In July of this year, the Council informally approved the Lake Decatur Dredging Plan <br /> prepared by City staff. The first step of the Plan is to survey Basin 6 of Lake Decatur to <br />� determine the quantity and physical characteristics of the Lake bottom sediments. This <br /> information is vital to conduct the next Plan steps - determining sediment disposal site(s) and <br /> purchasing dredging equipment. <br /> Qualified engineering services firms and the Illinois State Water Survey, an agency of the <br /> State of Illinois government, are capable of performing these types of surveys. The Illinois State <br /> Water Survey was contacted by staff due to their sediment survey expertise. They have <br /> conducted all of the past Lake Decatur sediment surveys in 1930-2, 1936, 1946, 1956, 1966 and <br /> 1983. Mr. William Bogner, a co-author of the 1983 study, is available to be the Project Manager <br /> of the proposed new survey. <br /> Per the attached proposal (entitled University of Illinois Standard Research Agreement No. <br /> 00-148) the Illinois State Water Survey, weather permitting, will survey Basin 6 next spring, <br /> provide preliminary results by May 31, 2000, and provide a final report by August 31, 2000, at a <br /> fixed cost of$22,117. This is considerably lower that the Dredging Plan estimate for this survey. <br /> Current low lake levels prevent the possibility of beginning the survey this fall. Therefore, <br /> staff recommends that Council approve the attached resolution. <br /> attach: 2 <br /> cc: William Bogner, ISWS <br />