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<br /> ~~t~iul~iiii«<i~i <br />STATE OF O~LORHVy <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmem of Natural Resources <br />131 7 Sherman SL. Room ? 15 y <br /> <br />Denver, Colorado 80203 Il <br />~~~ <br /> <br />Phone 1303) 866-356: I <br />FA%. 1307) 832-8106 <br /> DEPARTME[VT OF <br /> NATURAL <br /> RESOURCES <br />January 3, 19515 <br />Roy Romer <br /> Gnoernor <br />lames 5. Lochhead <br />Mr. Rick Mills E>eculive Director <br />Michael B. Lnng <br />Cyprus Empire Corporation Division Diieaor <br />29515 Routt County Road #27 <br />Oak Creek, CO 80467 <br />RE: Eagle 5 & 9 Mine (C-8]-044) <br />1994 Annual Hydrology Report <br />Dear Mr. Mills, <br />J <br />The Division of Minerals and Geology received the 1994 Annual Hyd:-ology Report (AHR) <br />October 2, 1995. The Division reviewed the report and has the following comments; <br />1. Bedrock Groundwater Levels <br />Trout Creek Sandstone: Both of the monitoring wells completed in the Trout Creek <br />Sandstone had been used as pumping wells. The wells have experienced a recovery <br />in water level which the operator attributes to a reduction in pumping. The wells <br />have experienced about a 200 foot recovery from their maximum drawdowns. Water <br />levels are about 45-70 feet lower than when monitoring began. The Okie Plaza well <br />was mined through in 1994. <br />Middle Sandstone: Water levels in the Middle Sandstone appear to have been <br />affected by mine dewatering and by subsidence. Water level fluctuations are greater <br />in wells which are in closest proximity to the mine workings. The operator notes that <br />the potentiometric gradient trends south as a result of water level drops above the <br />longwall panels. However, the contours drawn on the Middle Sandstone <br />Potentiometric Surface Map indicate more of a westerly Flow. Please clarify this with <br />the Division. The contour lines should also he labeled to avoid confusion. <br />Twentymile Sandstone: No long term trends in water levels were noted in the <br />Twentymile Sandstone. The hydraulic gradient in this aquifer remains toward the <br />northwest. <br /> <br />,~ <br />