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M-2008-078 - GP Ranches, LLC - West Farm Pit - 112 (c) Application Adequacy Review 01 Response <br />March 17, 2009 <br />-6- <br /> <br />Phase Reclamation <br />Timeframe <br />1 2 ears <br />2 2 ears 6 months <br />3 1 ear 9 months <br />4 1 ear 9 months <br />5 1 ear 9 months <br />6 1 ear 9 months <br />7 1 ear 9 months <br />g 1 year 9 months <br />9 1 ear 9 months <br />10 1 year 9 months <br />11 1 year 9 months <br />12 1 year 9 months <br />13 1 year 9 months <br />14 2 ears <br />15 2 ears <br />16 2 ears <br />17 2 ears <br />18 2 ears 3 months <br />6 4 6 Exhibit F - Reclamation Plan Map <br />21. Please identify all known aquifers as required by Rule 6.4.7(2)(6). <br />An updated Exhibit C Pre-mining/Mining Plan Map is attached that identifies all known aquifers <br />within the permit area per Rule 6.4.7(2)(b). <br />6 4 7 Exhibit G - Water Information <br />22. According to the Mining Plan Map, it appears that a portion of the site lies within the floodplain <br />of the Arkansas River. In the event of a significant flood event (10 year flood or greater) it is likely <br />that the pits and/or reclaimed reservoirs will be captured by the Arkansas River. The Division <br />requests that the applicant provide the flood elevation(s) to be expected under a "worst case" <br />flooding scenario and specific mitigation measures that will be implemented to minimize the <br />potential for offsite impacts. Mitigation measures might include the installation of drainage pipes <br />within the internal berms separating pits and/or armoring reclaimed pit slopes in close proximity <br />to the Arkansas River with erosion control riprap. <br />Please reference response to Item 9 above. <br />23. The Operator proposes to construct groundwater recharge ditchlpond structures if groundwater <br />levels drop to a level that prevents an adjacent well from performing properly. Please provide the <br />dimensions/specifications of the recharge structures. The groundwater recharge ditch/pond <br />structures will be considered a part of the affected land. Please note that if these structures are <br />constructed outside of the approved permit area, the Operator will need to amend the Reclamation <br />Permit to incorporate them into the permit boundary. <br />V 1400 W 122nd Avenue - Suite 120 • Westminster CO 80234 • Ph: 303-457-0735 • Fax: 303-920-0343