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PERMFILE64023
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PERMFILE64023
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Entry Properties
Last modified
8/24/2016 11:10:02 PM
Creation date
11/20/2007 8:14:30 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981028A
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
2.05 Operation and Reclamation Plans
Media Type
D
Archive
Yes
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E, Coors seeding plan is filed in L-4. [t is hoped that this seed mix will improve <br />both the domestic and wildlife range habitat. (See letters on pages 129 and 129a <br />of this Section.) Also, see Section 2.04.11, Fish and Wildlife Resource <br />Information. <br />Protection of the Hydrologic Balance <br />Detailed descriptions, maps and cross-sectional drawings regarding the quality and <br />quantity of surface and subsurface water at the Keenesburg Mine is summarized in <br />Section 2.04.7, Hydrological Description, and at Appendix I of previous permit <br />submittals. The focus of this permit renewal (five year plan) is on reclamation, to the <br />exclusion of further mining operations. The previous mine pits ("A" and "B") have <br />both been reclaimed to at least five feet above the ground-water level, and are lined <br />with the clay spoils to create an impervious barrier between the ground water and the <br />ash/mine waste rock which is being deposited in those pits. <br />The sub-surface water gradient, to the extent that it exists in the spoil, still tends to <br />slope to the east. Recharge of the spoil aquifer appears now to be limited to a single <br />source, infiltration by precipitation, since the pit areas have been isolated and any <br />standing water cannot communicate to the sub-surface water interval. There is still <br />no indication that any significant recharge from the Ennis Draw fluvial ground water <br />system exists. Sub-surface water elevations in the wells existing in Ennis Draw <br />adjacent to the Keenesburg Mine site are significantly higher than in either spoil <br />monitoring well, as confirmed by both Appendix I-2 of previous permit submittals, <br />and the more recent data found in the Annual Hydrology and Reclamation Reports. <br />The lack of recharge of the spoil aquifer system by the subsurface waters in Ennis <br />Draw are thought to be the result of limiting the eastern extent of the mining <br />operation (not penetrating the area of Ennis Draw, itself), <br />No appreciable effect on the hydrologic balance of the area is anticipated as a result <br />of the mining and !or reclamation operations, and water levels in the mined area are <br />expected to eventually recover to approximately their original levels following the <br />cessation of mining operations {McWhorter). Water quality information gathered <br />over the past 12 years confirms this (see Appendix J-l, J-2 of the 2nd Permit <br />Renewal, and the Annual Hydrology and Reclamation Reports. Treatment of the <br />sub-surface and ground-water will not be necessary. <br />Appendix M-l, Existing Surface Features Map, shows the location of any significant <br />water diversion, collection, conveyance, storage and discharge structures (these <br />include the perimeter ditches, the Dugout Pond and Sediment Pond 2 as permanent <br />structures). Due to the highly permeable sand mantle that surrounds the site, these <br />structures do not convey/hold water for any period of time. The design of the <br />perimeter ditch is to capture and carry water from all areas within the site which have <br />been disturbed by mining and subsequent reclamation activity to Sediment Pond #2. <br /> <br />125 6/98 <br />
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