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#4 should be avoided because these locations are too close to surface-water bodies and water-quality <br />issues associated with drawing in surface water may occur. It is also important to note that only one <br />well in each aquifer should be placed at each well site. A well spacing of about 2,000 feet between <br />wells pumping in the same aquifer is important to keep well-interference effects to a minimum. <br />5.5 Suggestions for Further Site Evaluation <br />As a next step in evaluating the well sites for suitability as paired wells, the following (in order) are <br />recommended: <br />1. Construct hydrogeologic cross sections through promising well-site areas, using well logs <br />from existing wells, to better evaluate the aerial extent and connectivity of the permeable <br />deposits in these areas. Isopach (thickness) maps of each well site should be constructed). <br />2. Test wells at candidate well sites should be installed, along with one monitoring well in the <br />unconsolidated aquifer a short distance away from the test well. A series of controlled aquifer <br />tests should be performed at each well site to obtain better estimates of transmissivity, <br />storativity, specific capacity, sustainable well yield, and to determine the degree of <br />interaction between the unconsolidated aquifer and the Mt. Simon-Hinckley aquifer. <br />3. Water-quality tests should be performed on samples collected at various times during aquifer <br />tests to verify that the water-quality of the aquifer is suitable for apublic-water supply. <br />P:\Mpls\23 MN\71\237] 105 Water Supply Alternative Study\FinalDelive[ables\Altematives_Repott_final.doc 42 <br />