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GENERAL46014
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Last modified
8/24/2016 8:16:42 PM
Creation date
11/23/2007 2:15:32 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1984065
IBM Index Class Name
General Documents
Doc Date
11/17/1992
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR RN2
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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<br />located in the projected loadout facility area, have been <br />dropped from monitoring due to Permit Revision 2, which <br />relocated the loadout site to Clough Industrial Park, 17 miles <br />west of the mine. Well LO-1 is located at the loadout <br />facility. Wells OW-3L and OW-7 have been dry during the <br />monitoring period 1983 to present. SK-3.75, SK-3H, SK-7 and <br />SK-8A were the original Storm King exploration/investigative. <br />wells and have been dropped from monitoring by Technical <br />Revision 04 approved July 13, 1988. <br />Probable Hydrological Consequences <br />The Coal Ridge No. 1 Mine is located along the north flank of <br />the Grand Hogback Monocline, adjacent to the Colorado River in <br />Garfield County, Colorado. Glenwood Springs, the county seat, <br />is seven miles east of the project, and the town of New Castle <br />is located approximately 1.5 miles north and west. The <br />topography of the mine area ranges from 5,600 feet in elevation <br />at the Colorado River up to 7,585 feet at the crest of the <br />Grand Hogback. <br />Bedrock outcrops at the mine site include the Upper <br />Cretaceous-aged Mancos shale and the Mesaverde Formations. The <br />Mancos shale is at least 4,000 feet thick in the area, is <br />easily erodible, and intertongues with the lower part of the <br />Mesaverde Group. The lower Mesaverde Group is referred to as <br />the Iles Formation, which consists mostly of shale with several <br />sandstone members known, from oldest to youngest, as the <br />Corcoran, Cozzette, and Rollins Sandstones. The Williams Fork <br />Formation conformably overlies the Iles Formation, and includes <br />in its lower section the Wheeler Coal Seam which is to be mined <br />at Coal Ridge. Above the Wheeler Seam are two mappable <br />sandstone members, the Middle and the Upper Sandstones, as well <br />as several uneconomic coal seams. The Wheeler Seam is <br />separated from the underlying Rollins Sandstone by <br />approximately 75 feet of shale and sandstone. In places the <br />Wheeler Seam is split into two seams which total up to 35 feet <br />in thickness. <br />The formations exposed in the Grand Hogback dip to the south <br />and southwest, into the Piceance Basin, at approximately 60 <br />degrees. The depth to the formations in the Basin has greatly <br />limited their potential for water development. Potential <br />aquifers in the section include the Rollins Sandstone, Wheeler <br />Coal, and the Middle and Upper Sandstones. The Middle and <br />Upper Sandstones in the permit area do not yield water, while <br />the Rollins Sandstone and Wheeler Coal typically yield less <br />than 5 GPM, and are saturated only in deeper areas. The Grand <br />Hogback is thought to be principally a recharge zone for these <br />formations. <br />The Probable Hydrologic Consequences section of the original <br />Findings Document stated that mixing of ground waters of the <br />Rollins Sandstone and Wheeler Coal was possible due to <br />_lg_ <br />
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