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This will include accounting for the K of the non-sandstone and siltstone <br />materials, smoothing, and addition of control points in areas where data are <br />sparse to develop K values appropriate for groundwater modeling <br />Aquifer storage coefficient data are still unavailable in the Upper and Lower <br />Dawson and the Upper Arapahoe Aquifers. Storage coefficient point values in <br />other aquifers are generally clustered in small areas. This aquifer property data <br />is needed when evaluating water supply and in undertaking transient (time- <br />dependent) groundwater modeling, so the lack of this data could be a source of <br />uncertainty in evaluating the modeling results, especially with respect to <br />pumping effects. <br />5.0 Recommendations <br />• When aquifer property data are collected by well owners as part of their routine <br />well installation and testing, the State should request aquifer pumping test <br />results and other aquifer property data, such as core sample analyses, as part of <br />the well permitting process <br />• Aquifer property and specific capacity data from well construction and testing <br />reports should be entered into HydroBase when they are received. <br />• The HydroBase structure should be revised to accommodate multiple laboratory <br />test data values from a single borehole, and to identify data from confining units <br />to provide a more comprehensive database for aquifer property data. Both sets <br />of data could be a benefit in groundwater modeling. <br />• The number of allowable characters should be expanded in the "data source" <br />and the "ptsource" fields in the Wells and Pumping test tables, respectively, to <br />allow a bibliographic reference (up to approximately 240 characters) rather than <br />the 10 characters currently allowed. <br />• If transmissivity and hydraulic conductivity data derived from aquifer pumping <br />tests are available, they should be used instead of the specific capacity-derived <br />data; and likewise, if specific capacity-derived data are available, they should be <br />used instead of laboratory test-derived data. <br />• Encourage collection of multi-well aquifer test data, where feasible, from which <br />high quality aquifer property data (T, K, and S/Sy) can be obtained. This could <br />be accomplished during the well permitting process with a request that well <br />operators installing replacement wells defer abandonment of their original well <br />until the new replacement well can be used as a pumping well in an aquifer test <br />during which the original well is used as an observation well. <br />SPDSS Phase 2 Task 43.2 TM -Final 27 <br />2/ 13/ 2006 <br />