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Require- <br /> Require- ment <br />Requirement ment complied Comment <br /> citation with ? (yes <br /> /no <br />R. Prevention of Data from the down-gradient bedrock monitoring wells (03- <br />adverse 11-1 and 01-11-1) indicate there have been no signifcant <br />impacts to CDMG impacts to bedrock ground water outside the permit area. TDS <br />ground water regulation yes in these wells in 2004 were neaz the premining 2,700 mgll level <br />systems 4.05.11 found on the mine in the B and E seams. Alluvial (colluvial) <br />outside the monitoring wells that are completed in North Fork River valley <br /> downgradient from the mine (GP-3 and GP-4) were dry when <br />permit area sam led in 2004. <br />S. Prevention of <br />impacts to CDMG <br />ground regulation <br />water that s <br />adversely 4.05.1(2) yes <br />impact the and <br />postmining 4.05.11 <br />land use <br /> Monitoring data indicate impacts to ground water and surface <br /> water have been the minimum that can be expected for an <br /> underground coal mine. The most significant hydrologic <br /> impacts from mining at West Elk in 2004 were: <br /> 1) As in previous years, mining in long-wall panels may <br />T. Minimization have been the cause of water level fluctuations in nearby <br />of monitoring wells (located within a few hundred feet of <br />disturbance the workings). <br />to the 2) The mine's discharge of underground mine water and <br />hydrologic CDMG surface runoff into the North Fork of the Gunnison <br />balance regulation yes River raised the concentration of dissolved solids in the <br />within and 4.05.1(1) river. The increase was probably greatest during <br />adjacent to pumping of underground mine water in Sylvester Gulch <br />the permit which flows to the North Fork. The increase probably <br /> remained in the ] 0 to 75 mg/1 range and did not exceed <br />area levels predicted in DMG's Cumulative Hydrologic <br /> Impact Study for the North Fork. As explained in item <br /> U below, monitoring data indicate North Fork TDS <br /> remained well below a level of concern for irrigation <br /> water. (Water from West Elk's underground mining <br /> pumping and surface runoff are too alka{ine to <br /> si nificantl mobilize metals.) <br />Page 5 <br />