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<br /> <br />Requirement <br />Require- <br />ment <br />citation Require- <br />ment <br />complied <br />with ? <br />(yes I nol <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 Coal Mine. 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 mine workings (the <br /> V. Paulek and G. Paulek wells). <br /> If the King Coal Mine workings eventually fill with water, it <br /> seems unlikely the water could be transmitted from the workings to <br /> [he Clifthouse Sandstone directly through the roof of the workings <br /> because the roof rock is composed of shale, which probably is <br /> impermeable. (Drill hole sample logs in Appendix 4 of the permit <br /> show the Upper Coal Seam of the Menefee Fonna[ion, the seam <br /> mined at King Coal, is bounded above and below by shale.) <br /> Subsidence fractures, however, could provide a conduit of flow for <br />AA. Adequacy water from the workings to the overlying Cliffhouse. Therefore, if <br />of ground CDMG the workings fill with water, and subsidence fractures convey that <br />water regulation yes water to [he Clifthouse Sandstone, then impacts could possibly <br />monitoring 4.05.13(1) occur [o [he water quality in the Cliffhouse Sandstone aquifer <br />program downgradient from the workings. <br /> It seems unlikely, however, that the King Coal Mine will ever fill <br /> with water. The workings have been dry (with the exception of a <br /> short time in early 1986) and drilyholes in the overburden have <br /> been dry. (Water for the mine's dust and fire control is pumped <br /> from an alluvial well and an old well of unknown depth.) The mine <br /> appears to underlie [he updip, unsaturated portion of the Cliffhouse <br /> Sandstone. Impermeable shale and siltstone of the Menefee <br /> Fonna[ion underlie [he 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 would be warranted, <br /> however, if the mine encounters water inflows. <br /> A regional aquifer about 250 ft. stratigraphically below the mine <br /> workings, the Point Lookout Sandstone, was planned for <br /> monitoring in late 2000 in the Haugen well about 5000 ft. <br /> down radient from [he workin s. <br />BB.Adequacyof CDMG <br />surface water <br />regulation <br />yes <br />monitoring 4.05.13(2) <br />ro ram <br />Page 5 <br />