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Require- <br /> <br />Requirement Requirement <br />citation ment <br />complied <br />Comment <br /> with ? (yes <br /> / no) <br /> Compliance with the Basic Standards for ground water, as explained in item F, above, <br /> indicate the permittee is preventing adverse impacts to ground water quality outside the <br /> permit area. Monitoring data indicate the permittee is preventing impacts to water quantity <br /> outside the permit area. Previous years' hydrology reports indicated mining has dropped <br /> the potentiometric surface of the Wadge overburden by about 200 ft. in undermined areas <br /> (wells 93M001, 93M003, and FBRl IAO), but not in areas beyond mining or the permit <br />M. Prevention of area (well 008-7758). Mining has not dropped the potentiometric surface of the <br />adverse impacts Twentymile Sandstone outside the permit area (wells 91-M005, FBR-11B, and FBR-2). <br />to ground water CDRMS regulation es Between 2002 and 2005, the water level in the Twentymile Sandstone within the permit <br />systems outside 4.05.11 y area in well FBR-2 dropped 55 ft. and TDS increased in 2005 by approximately 200 mg/l. <br />the permit area These changes may have resulted from the well's location within 1,000 ft. of the outcrop <br /> of the Twentymile Sandstone. The Twentymile would not be a confined aquifer near the <br /> outcrop and, consequently, could have relatively wide water level fluctuations. Pumping <br /> for mine use of Trout Creek sandstone well 001-83-106 is probably the cause of a drop of <br /> few hundred feet in the potentiometric surface of the Trout Creek Sandstone at that well <br /> and at another Trout Creek Sandstone well, 001-83-107. These drops is probably only a <br /> local impact because the two wells are near the Trout Creek Sandstone's updip outrop belt; <br /> therefore, the impact would not be expected to extend beyond the permit area. <br />N. Prevention of <br />impacts to The Trout Creek Sandstone could supply the needs of the approved postmining land uses of <br />ground water that CDRMS regulations pastureland and rangeland, in the permit area. Data from monitoring well 97013TC indicate <br />adversely impact 4.05.1(2) and yes mining has not impaired the use of the ground water from the Trout Creek Sandstone in the <br />the postmining 4.05.11 permit area. <br />land use within <br />the permit area <br />0. Minimizatio <br />n of disturbance The disturbance to the hydrologic balance within and adjacent to the permit area caused by <br />to the hydrologic CDRMS regulation mining and reclamation at the Foidel Creek Mine is the minimum that can be expected <br />balance within 4.05.1(1) yes from an underground mining operation at this location. Use of best management practices <br />and adjacent to indicates minimization of disturbance to the hydrologic balance. <br />the permit area <br />Page 4