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<br />.'. <br />, . . <br /> <br />'. ' <br /> <br /> <br /> <br />MEMO <br /> <br />TO: <br />Rebecca Haug, Environmental Administrator <br />COMPANY: <br />City of Elk River <br />FROM: <br />Matthew Ledvina, P.E. <br />DATE: <br />March 9, 2006 <br />RE: <br />Aggregate Industries - Application for CUP and License Amendment <br />NOTES/COMMENTS: <br /> <br />As requested, I have reviewed the above referenced document for City of Elk River CUP and License <br />Amendment. Representatives of Aggregate Industries (AI) have also provided background <br />documents which include the 2001 and 2003 Applications. AI has stated that general operations will <br />be in accordance with the previous documents with the noted modifications. The following <br />comments are provided in support of Conditional Use Permit (CUP) amendment for the Site. <br /> <br />2006 Operations Plan <br /> <br />AI provided a 2006 Operations Plan with their application. AI should provide current elevation <br />information for the site to enable assessment with the 2003 AI grading plan. I was unable to <br />determine the extent of the site which has been reclaimed. From the aerial photos, it appears that <br />the extent of reclamation has been limited. I recommend that AI present a schedule for reclamation <br />of areas of the site that have been mined and are currently inactive (see item (09) b. of the CUP) <br /> <br />Groundwater Conditions <br /> <br />Ground water conditions have not been assessed for the Site. From reference technical information, <br />the ground water table occurs at an elevation between 940 and 970 msl. The 2003 AI grading plan <br />indicated that the lowest mined elevation would be approximately 1000 msl. This implies that a <br />significant buffer of native unsaturated soils will remain between the ground water table elevation and <br />the extent of mining. This vertical buffer of unsaturated soil will help reduce the potential impacts to <br />groundwater resources in the event of a spill at the site. <br /> <br />. <br />MINNEAPOLIS <br />1000 IDS Center <br />80 South Eighth Street <br />Minneapolis, MN 55<<>2 <br />612.347.6789 <br /> <br />o <br />HOUSTON <br />Suite 200 <br />520 Post Oak Boulevard <br />Houston, 1)( n027 <br />832.203.1492 <br /> <br />o <br />DENVER <br />Tower One, Suite 580 <br />1515 Arapahoe Street <br />Denver, CO 80202 <br />nO.956.5300 <br /> <br />o <br />PROVIDENCE <br />Suite 2020 <br />One Financial Plaza <br />Providence. RI 02903 <br /><<> 1.278.4300 <br /> <br />o <br />ANCHORAGE <br />Key Bank Plaza, Suite 30 I <br />601 W. Fifth Avenue <br />Anchorage, AK 9950 I <br />907.m.53oo <br />