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<br /> <br />Requirement <br />Require- <br />ment <br />citation Require- <br />ment <br />complied <br />with ? <br />(yes / <br />no) <br /> <br />Comment <br />Z. Agreement CDRMS <br />of observed regulation <br />hydrologic 2.05.6(2) <br />impacts with and <br />"probable requireme <br />hydrologic nt to keep yes <br />consequences informatio <br />" (PHC) n current, <br />projected in CDRMS <br />mining regulation <br />permit 2.03.3(1) <br /> Mining impacts to the Cliffhouse Sandstone cannot be definitely <br /> ruled out because the Cliffhouse is not monitored downgradient <br /> from the King I and H Mines. The potential for impacts to the <br /> Cliffhouse is of interest because the sandstone may be used as an <br /> aquifer near the mine. The State Engineer's records show two <br /> wells have been completed in the Clifthouse Sandstone <br /> approximately one mile downgradient from the King I Mine <br /> workings (the V. Paulek and G. Paulek wells). <br /> If the King I or King H Mine workings eventually fill with water, <br /> it seems unlikely the water could be transmitted from the workings <br /> to the Cliffhouse Sandstone through intergranular porosity in roof <br /> rock of the workings because the roof rock is composed of shale, <br /> which probably is impermeable to water. (Drill hole sample logs in <br /> Appendix 4 of the King I Mine part of the permit show the Upper <br /> Coal Seam of the Menefee Formation, the seam mined at King, is <br /> bounded above and below by shale.) Subsidence fractures in the <br />AA. Adequacy roof rock, however, could provide a conduit of flow for water from <br />of ground CDRMS the workings to the overlying Cliffhouse. Therefore, if the <br />water regulation yes workings fill with water, and subsidence fractures convey that <br />monitoring 4.05.13(1) water to the Cliffhouse Sandstone, then impacts could possibly <br />program occur to the water quality in the Cliffhouse Sandstone aquifer <br /> downgradient from the workings, if mine water is lower quality <br /> than ambient ground water. <br /> As explained in item T, above, it appears unlikely the workings <br /> of the King I and II Mines will ever fill with water. The mines <br /> appear to underlie the updip, unsaturated portion of the Cliffhouse <br /> Sandstone. Impermeable shale and siltstone of the Menefee <br /> Formation underlie the workings, and also are unlikely inflow <br /> sources. Based on the continued dry outlook for the workings, a <br /> monitoring well is not warranted in the Cliffhouse Sandstone <br /> downgradient from the mine. Such a well could be warranted, <br /> however, if a significant amount of water flows into the workings. <br /> A regional aquifer about 250 ft. stratigraphically below the mine <br /> workings, the Point Lookout Sandstone, was monitored between <br /> 2000 and 2007 in the Haugen well about 5000 ft. downgradient <br /> from the King I Mine workings. Data from the well showed no <br /> impacts from mining at King. <br />Page 6