Laserfiche WebLink
<br /> <br />Requirement <br />Require- <br />ment <br />citation Require- <br />ment <br />complied <br />with ? (yes <br />/ no <br /> <br />Comment <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 /> have been the cause of water level fluctuations in nearby <br />T. Minimization monitoring wells (located within a few hundred feet of <br />of the workings). <br />disturbance 2) The mines discharge of underground mine water and <br />to the CDMG surface runoff into the North Fork of the Gunnison <br />hydrologic regulation yes River raised the concentration of dissolved solids in the <br />balance 4.05.1(1) river. The increase was probably greatest during <br />within and pumping of underground mine water in Sylvester Gulch <br />adjacent to which flows to the North Fork. The increase probably <br />the permit remained in the 10 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 alkaline to <br /> significantly mobilize metals.) <br />Page 5