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REV02407
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REV02407
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Entry Properties
Last modified
8/25/2016 1:00:01 AM
Creation date
11/21/2007 9:00:39 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1984065
IBM Index Class Name
Revision
Doc Date
10/1/1990
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR PN 1 COAL RIDGE 1 MINE C-84-065
Type & Sequence
PR1
Media Type
D
Archive
No
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-10- <br />Well OW-4L, the purpose of which was to collect baseline water quality data in <br />the area of the previously proposed loadout site east of Riverbend <br />subdivision, has apparently had its casing broken below ground level. The <br />well can no longer be located. NCEC has committed to replacement of OW-4L <br />with an alluvial well downgradient from Sediment Pond A prior to mining of <br />coal. Because reclamation of the well in accordance with Rule 4.07.3 may not <br />be possible, the following stipulation is necessary: <br />STIPULATION N0. 17 <br />FOLLOWING DIVISION INSPECTION OF THE AREA OF WELL OW-4L, THE APPLICANT <br />SHALL WITHIN 60 DAYS EITHER A) IF THE WELL HAS NOT BEEN LOCATED, SUBMIT A <br />REPORT IN COMPLIANCE WITH RULE 4.07.3(3) WHICH DESCRIBES THE <br />CIRCUMSTANCES BEHIND LOSS OF THE WELL, OR B) RECLAIM THE WELL IN <br />ACCORDANCE WITH 4.07.3. <br />VIII. <br />The Coal Ridge #1 Mine is located along the flank of the Grand Hogback <br />Monocline, adjacent to the Colorado River in Garfield County, Colorado. <br />Glenwood Springs, the county seat, which owns a portion of the coal to be <br />mined, is seven miles east of the project, and the town of New Castle is <br />located approximately 1.5 miles north and west. The topography of the mine <br />area ranges from 5600 feet in elevation at the Colorado River up to 7585 feet <br />at the crest of the Grand Hogback. <br />Bedrock outcrops at the mine site include the Upper Cretaceous-aged Mancos <br />Shale and the Mesa Verde Formation. The stratigraphy specific to the mine <br />site is shown in Figure 1. <br />The Mancos Shale is a highly erodable formation consisting of two thick marine <br />shale members separated by a limestone member, and is at least 4000 feet. <br />thick in the mine area. The Mancos Shale conformably underlies and <br />intertongues with the lowermost formation of the Mesa Verde Group. <br />The Mesa Verde Group is composed of the lowermost Iles formation, Williams <br />Fork Formation, and an overlying 2000 feet of undifferentiated deltaic-type <br />deposits. The Iles and Williams Fork Formations are typified ,by interbedded <br />shales, siltstones, sandstones and coal. The Rollins Sandstone is generally <br />considered as the uppermost unit within the Iles formation, forming the <br />contact with the Williams Fork formation. The Rollins is typified by fine to <br />medium-grained sandstone that weathers to light buff. Bedding is commonly <br />massive. <br />The Wheeler Coal of the Williams Fork Formation will be mined at Coal Ridge <br />No. 1. This coal overlies the Rollins Sandstone. In eastern portions of the <br />permit area, the Wheeler seam is split into a lower and main member. The <br />lower Wheeler is described as generally being 15 feet thick and underlies the <br />main Wheeler by 30 feet. The Wheeler seam is more persistent and in the mine <br />area is described as being 15.5 to 22.5 feet thick. These coals are overlain <br />by approximately 400 feet of coal-bearing shale. Two mappable sandstone units <br />occur within the Williams Fork Formation, approximately 450 and 750 feet, <br />respectively, above the Wheeler Coals. These sandstone units are the Middle <br />
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