R2000-258 AUTHORIZING AGREEMENT - Laserfiche WebLink

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Task 5. Review of the findings. Once all of the results have been gathered, an analysis of the information will be conducted to determine what parts of the model should be changed, which parts of the model are acceptable as is, and finally, if the model will adequately predict water level declines This effort will include an assessment of the data to determine if the information available to the modelers was/is accurate enough to allow for the acceptable completion of ground-water flow model (i.e., do we know enough about the connections between aquifers?). Task 6. Develop a report of the findings and recommendations. A contract report will be developed that will describe all of the effort in the preceding five tasks, due at the end of the project. A technically reviewed draft of the report will be available to the City of Decatur eight weeks after the model code and data are made available to the ISWS. The report will include recommendations for further action by the City to better understand and predict impacts from pumpage of their emergency well field. If the project were to start on August 1, 2000 as proposed, the draft contract report would be available to the City on or before September 26, 2000 and the published contract report would be available on or before November 30, 2000. In addition, staff of the ISWS will be available to meet with the City of Decatur to present and discuss the results of their findings. Experience & Past Investigations The ISWS has a strong background in modeling and in assessment of the Mahomet I aquifer. Mark Anliker from the ISWS has completed 2 reports for the Mahomet Valley Water Authority in the area around the emergency well fields that detail water levels and the hydraulic conditions that are cunently known. In Mark's 2"d report, he outlines a plan for developing a long-term observation well network that would provide important new data on the geology and water levels in the area. Steve Wilson, George Roadcap, and others completed a multi-year study for the Long Range Water Plan Steering Committee in the McLean-Tazewell counties region that included the development of a sophisticated 3D ground-water flow model that will predict drawdown in the Mahomet aquifer and in the two shallower aquifers identified in that region. That study was a benchmark study for the ISWS that has served as the example of the approach needed for conducting large ground-water resource investigations. Recently, George Roadcap sent the City of Decatur a letter concerning the RFP for this proposal. In that letter, George identified some concerns regarding the current ground-water flow model and the approach taken to develop that model. This "initial investigation" provided the impetus to develop this proposal. The ISWS is uniquely qualified to conduct this study for several reasons. First of all, most of the data in the original model (10 of the 13 references and many other personal contacts during the development of the model) came from the ISWS. For example, the interpretation of the water level data used as the calibration target was completed by the ISWS and provided to LGI. Secondly, a review of our public files reveals that there may be 4