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deposits. In these areas, the Mt. Simon-Hinckely Aquifer is recharged (and these areas may be <br />important recharge areas for the aquifer as a whole). Some stream loss from the Mississippi River to <br />the Mt. Simon-Hinckley Aquifer may take place in this area. <br />The Mt. Simon-Hinckley Aquifer has proven to be productive in the Elk River area. Some of Elk. <br />River's wells have begun to experience lowered hydraulic head (water levels in wells) in response to <br />pumping during the summer. The Mt. Simon-Hinckley Aquifer is locally recharged by downward <br />leakage from the overlying glacial drift (with is mostly permeable sand and gravel outwash) and <br />areas where the Eau Claire Formation is thinner and/or fractured to produce secondary permeability <br />features. <br />P:\Mpls\23 MN\71\2371 105 Water Supply Alternative Study\FinalDeliverables\Alternatives_Report_final.doc 1 g <br />Figure 10 Areas of Increased Pumping Between 1990 and 2005 <br />