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Require- <br /> <br />Requirement Requirement <br />citation ment <br />complied <br />Comment <br /> with ? <br /> es/no <br />Q. Restoration of <br />ground water CDRMS Mining in the permit area cannot be expected to significantly decrease infiltration of snowmelt or <br />recharge to <br />approximate regulation <br />4.05.11(3) yes runoff into the subsurface. Monitoring data do not show an impact on recharge. <br />reminin rate <br />R. Prevention of Data from the down-gradient bedrock monitoring wells (03-11-1 and 01-11-1) indicate there have <br />adverse impacts CDRMS been no significant impacts to bedrock ground water outside the permit area. TDS in these wells in <br />to ground water regulation yes 2006 were less than the premining 2,700 mg/1 level found on the mine in the B and E seams. <br />systems outside 4.05.11 Alluvial (colluvial) monitoring wells that are completed in North Fork River valley downgradient <br />the permit area from the mine (GP-3 and GP-4) were d (or nearl so when sam led in 2006. <br />S. Prevention of <br />impacts to CDRMS <br />ground water regulations <br />that adversely 4.05.1(2) and Yes <br />impact the 4.05.1 l <br />postmining <br />land use <br /> Monitoring data indicate impacts to ground water and surface water have been the minimum that <br /> can be expected for an underground coal mine. The most significant hydrologic impacts from <br /> mining at West Elk in 2006 were: <br /> 1) As in previous years, mining in long-wall panels may have been the cause of water level <br />T. Minimization of fluctuations in nearby monitoring wells (located within a few hundred feet of the <br />disturbance to CDRMS workings). <br />the hydrologic <br />regulation <br />yes 2) In 2006, TDS in North Fork water showed a decrease where the stream passes the mine. In <br />balance within <br />' <br />4.05.1(1) past years, the mine's discharge of underground mine water and surface runoff into the <br />and ad <br />acentto <br />J North Fork of the Gunnison River has occasionally raised the concentration of dissolved <br />the permit area solids in the river. The increase was probably greatest during pumping of underground <br /> mine water in Sylvester Gulch which flows to the North Fork. The increase probably <br /> remained in the 10 to 75 mg/I range and did not exceed levels predicted in DRMS's <br /> Cumulative Hydrologic Impact Study for the North Fork. As explained in item U below, <br /> monitoring data indicate North Fork TDS remained well below a level of concern for <br /> irrigation water. <br />Page 5 <br />