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REV15852
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Entry Properties
Last modified
8/25/2016 1:27:13 AM
Creation date
11/21/2007 11:09:13 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981028
IBM Index Class Name
Revision
Doc Date
8/30/2001
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE
Type & Sequence
PR4
Media Type
D
Archive
No
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The Keenesburg Mine is located approximately 4.5 miles north of Keenesburg, Colorado. The <br />legal description of the permit azea is presented under paragraph 1.1 above. Of the 612.5 <br />(current) acres in the Permit area, 455.8 acres were disturbed [2000 Annual Reclamation Report <br />(2000 ARR)]. [The Keenesburg Mine was a surface mine, thus Affected acreage equals <br />Disturbed acreage at 455.8 acres.] Of [he 455.8 disturbed acres, 221.5 acres have been reclaimed <br />and revegetated (2000 ARR). In its 1996 Bond Release Application, CEC applied for Phase I and <br />II release of 111.5 acres of 179.6 reported as vegetated. <br />3.2.3 Resource to be Mined <br />There is no coal extraction activity at the site and none is anticipated (PAP, Sec 2.03.8, page 29, <br />5/96). The open pits are being backfilled with fly ash imported from the Trigen-Colorado <br />L.L.L.P, power plant in Golden, Colorado and reclaimed in accordance with the reclamation plan <br />described in the Permit. During active surface coal extraction, the number 7 seam of the Laramie <br />formation was mined (Application, Sec 2.04.5, para 3, page 41). <br />3.2.4 Geology, Soils and Topography (Application, Sec 2.04.5, page 39 through 2.04.6 page 47, <br />5/96) <br />The permit area is located on level to gently rolling topography consisting of fine sand, which is <br />wind-deposited material overlying weathered residual shale. The sand varies in depth from about <br />5 feet to 20 feet, is highly to moderately permeable, and is highly susceptible to wind erosion. <br />The flat-lying No. 7 coal seam is overlain by 60-180 feet of overburden consisting of yellow- <br />brown and gray to blue gray soft cazbonaceous shale and clay interbedded with sand and shaley <br />sand. At the base of the Laramie formation is the Fox Hills member, across-bedded gray to buff <br />sandstone, which is slightly to well cemented. <br />3.2.5 Surface and Ground Water (Application, Sec 2.04.5, paza 2, page 39-40) <br />Because of the low relief and deep, well-drained soils, there is virtually no surface runoff. No <br />streams, springs or seeps exist in the area. All water flows subsurface through aeolian deposits to <br />Ennis Draw, a topographic swale (ephemeral drainage? located along the eastern boundary of the <br />permit area. Ennis Draw appears to be a complex, braided, ancient steam bed that has been <br />covered by windblown sand. It discharges several miles to the north into Box Elder Creek. <br />Ground water moves laterally toward the northeast, and apparently discharges into the sands and <br />stream deposits in Ennis Draw. <br />At the time the mine was originally permitted, ground water in neither the coal nor overburden <br />was known to provide a water supply for any purpose in the vicinity of the mine. Since that time, <br />ground water is being drawn for industrial uses at the mine, and a number of other wells have <br />been drilled in the vicinity of the mine (review of State Engineer Records). However, no adverse <br />impact from the mine is expected, due to the geologic and hydrologic conditions of the site. <br />Permit Renewa104 Findings <br />30 August 2001 <br />Page 9 of 25 Pages <br />
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