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<br /> <br />Requirement <br />Require- <br />ment <br />citation Require- <br />ment <br />complied <br />with ? <br />es/no <br /> <br />Comment <br /> The following two aquifers are the most likely to be affected by <br /> mining at King Coal: the Hay Gulch alluvium and the Cliffliouse <br /> Sandstone. The Hay Gulch alluvium is monitored downgradient <br /> from the King I Mine in the Wiltze well, downstream from the west <br /> sediment pond. The Hay Gulch alluvium is monitored <br /> downgradient from the King II Mine in the mine's downgradient <br /> well. Historical data indicate compliance with the Basic Standards <br /> for ground water in this aquifer if a compliance point were <br /> established at either of the two downgradient wells. <br /> Although ground water impacts to the Cliffhouse Sandstone are <br /> not expected, compliance with the basic ground water standards in <br /> this aquifer is not known because the Cliffhouse is not monitored. <br /> Impacts to the Cliffhouse are not expected, however, due to the dry <br /> conditions of the King I Mine and expected dry conditions of the <br /> King II Mine. It seems unlikely that either mine will significantly <br /> fill with water after mining ceases. The workings of the King I <br /> Mine have been dry (with the exception of a short time in early <br /> 1986) and drillholes in the overburden have been dry. (Water for <br /> the mine's dust and fire control is pumped from an alluvial well <br />Basic <br />T CWQCC and an old well of unknown depth.) Aground water point of <br />. <br />Standards regulation compliance in the Cliffl~ouse Sandstone is not warranted because <br />for Ground s yes the King Coal operation lacks the potential to negatively impact <br />Water 41.4 and this unit. <br /> 41.5 A regional aquifer about 250 ft. stratigraphically below the mine <br /> workings, the Point Lookout Sandstone, was has been monitored <br /> since late 2000 in the Haugen well about 5,000 ft. downgradient <br /> from the workings. Data show no impacts to the ground water in <br /> the Haugen well from mining at King Coal. (The Haugen well was <br /> not sampled in part of 2007 due to lack of access. The missing data <br /> does not impair the assessment of hydrologic impacts.) <br /> The Point Lookout Sandstone is unlikely to be in hydraulic <br /> communication with the overlying King Coal Mine workings <br /> through intergranular porosity due to impermeable shale and <br /> siltstone in the intervening Menefee Formation. Communicatiron <br /> through fractures or faults could occur if the mine workings flooded <br /> to a level that produces enough head to overcome the <br /> potentiometric head of native ground water in the faults and <br /> fractures. As previously explained, it seems unlikely the King I and <br /> II Mine will significantly fill with water during mining or after <br /> mining ceases. Aground water point of compliance in the Point <br /> Lookout Sandstone is not warranted because the King Coal <br /> o eration lacks the otential to negativel im act this unit. <br />U. Restoration <br />of ground King Coal's 31 acres of surface disturbance probably is not enough <br />water CDRMS nificantly diminish recharge to aquifers, if any are recharged <br />to si <br />recharge to regulation yes g <br />in the area. Any diminution of recharge in undermined areas can <br />approximate 4.05.11(3) be expected to be confined to the affected area. <br />premining <br />rate <br />Page 4 <br />