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adverse impacts to <br />ground water systems <br />outside permit area <br />4.05.11(1) <br />Creek Mine lie downhill from the outcrop belt that rims the <br />Twentymile Park Syncline. Ground water is recharged in this <br />outcrop belt. The mine has not disturbed the rocks in this <br />outcrop belt which does not diminish the amount of <br />recharge. <br />Compliance with the Basic Standards for ground water, as in <br />item 10, indicates the permittee is preventing adverse <br />impacts to ground water quality outside the permit area. <br />Monitoring data indicate the permittee is preventing <br />impacts to water quantity outside the permit area. <br />Hydrology reports indicate that mining has dropped the <br />potentiometric surface of the Wadge overburden by <br />approximately 400 feet in undermined areas (well 93M001) <br />but not in areas beyond mining or the permit area (well 008- <br />77-58.) The steep decline in 93M001 was exhibited from <br />1994 to 2002 with the decline stabilizing from 2005 to 2013. <br />The Twentymile Sandstone water levels at well 006 - BRDH -7 <br />21. Prevention of <br />remained relatively constant with that of previous years, <br />impacts to ground <br />CDRMS regulation <br />with no mining impacts apparent. Levels in well FBR -2 <br />water that adversely <br />4.05.11(2) <br />dropped 56 feet in 2003 and dropped another 84 feet in <br />impact post- mining land <br />2005 which can be contributed to the approaching 16 Right <br />use <br />panel. In 2005 water levels began to recover and continue <br />through 2011. Pumping for mine use of Trout Creek <br />sandstone wells 001 -83 -106 and 001 -83 -107 is likely the <br />cause of a drop in the potentiometric surface of the Trout <br />Creek sandstone at these wells. There is a slight rising trend <br />from 2006 to 2013 at 001 -83 -106. These drops are likely a <br />local impact due to the proximity of the two wells near the <br />Trout Creek sandstone's up -dip outcrop belt. Therefore, the <br />impact would not be expected to extend beyond the permit <br />area. This appears to be the case as localized dewatering at <br />well 001 -83 -106 has stabilized in 2000 and continues to be <br />stable through 2013. A decline of water level in well 001 -83- <br />107 continues to be the trend in 2013. However the decline <br />appears to be more subtle at the end of 2013. <br />22. Minimize <br />CDRMS regulation <br />The Trout Creek Sandstone could supply the needs of the <br />disturbance to <br />4.05.1(1) <br />postmining land uses of pastureland and rangeland in the <br />hydrologic balance <br />permit area. Data from monitoring well 97013TC indicate <br />a� cO�a <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 I <br />1876 <br />