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<br /> <br />Requirement <br />Require- <br />ment <br />citation Require- <br />ment <br />complied <br />with ? <br />es I no <br /> <br />Comment <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 II 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 Cliffhouse 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 II 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 <br /> Coal, is bounded above and below by shale.) Subsidence fractures <br />AA. Adequacy in the roof rock, however, could provide a conduit of flow for water <br />of ground CDRMS from 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 /> appears 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, has been monitored since <br /> late 2000 in the Haugen well about 5000 ft. downgradient from the <br /> King I Mine workings. Data show no impacts from mining at King <br /> Coal. <br />BB.Adequacy of CDRMS <br />surface water regulation yes <br />monitoring 4.05.13(2) <br />rogram <br />Page 6 <br />