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aquifer in Elk River is the Mt. Simon-Hinckley Aquifer (which is currently being used by EIk River <br />Municipal Utilities. <br />O <br />0 <br />O <br />Groundwater Use 2005 <br />(Million Gallons) <br />0 0-10 O <br />• 10-2U <br />• 20-50 <br />• 50-75 <br />75 - 100 <br />4' 100 - 500 <br />500 - 1 .000 <br />• > 1 ,000 <br />~~ <br />O <br />5 5 5 10 15 Miles <br />Figure 9 Groundwater Pumping in the Greater Twin Cities Area: 2005 <br />The Eau Claire Formation overlies the Mt. Simon-Hinckley Aquifer in most of Elk River (see Figure <br />3). In the northern quarter of the City, north to Zimmerman, west to Big Lake, and north into <br />unincorporated parts of Sherburn County, the IV1t. Simon-Hinckley Aquifer is overlain by glacial <br />P:\Mpls\23 MN\71\2371105 Water Supply Alternative Study\FinalDeliverables\Alternatives_Report_final.doc 17 <br />