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2008-10-10_GENERAL DOCUMENTS - C1980007
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2008-10-10_GENERAL DOCUMENTS - C1980007
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Last modified
5/26/2020 2:15:47 PM
Creation date
10/16/2008 3:44:39 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
GENERAL DOCUMENTS
Doc Date
10/10/2008
Doc Name
Proposed Decision & Findings of Compliance for PR14
From
Proposes 152 Methane Drainge Wells in Panels E-2 to E-12 next 12 years
Permit Index Doc Type
Findings
Email Name
TAK
Media Type
D
Archive
No
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Seven categories of potential aquifers occur in the Somerset Coal Field. <br />These are: 1) the alluvial and terrace deposits associated with the North <br />Fork of the Gunnison River; 2) the localized, shallow alluvium along <br />creeks tributary to the North Fork; 3) the discontinuous, lenticular and <br />laminar sandstones of the Mesaverde Formation; 4) the Rollins <br />Sandstone; 5) the coal seams; 6) shallow colluvial surficial deposits; and <br />7) fracture zones in bedrock. <br />The most laterally continuous sandstone units in the region are the <br />Rollins Sandstone and the massive sandstone separating the Upper and <br />Lower Coal Members of the Mesaverde Formation, known as the Bowie <br />Sandstone. The Rollins crops out in the South of Divide area, <br />approximately one mile upgradient from West Elk's underground <br />workings. In the Jumbo Mountain area, the Rollins Sandstone appears to <br />be hydraulically isolated. To the south and west, the Rollins Sandstone <br />crops out in cliffs. In the Jumbo Mountain area, the average interburden <br />thickness between the B Seam and the Rollins Sandstone is 150 feet. <br />The Rollins Sandstone has been considered a hydrostratigraphic unit of <br />potential regional importance, because of its wide areal extent in the <br />southeastern Piceance Basin. The Rollins is a poor quality aquifer due to <br />its low permeability and poor water quality. A pump test of the Rollins <br />Sandstone near the West Elk Mine yielded 3 gallons per minute. <br />Drillholes in the Rollins in the vicinity of the Bowie #I Mine did not <br />yield enough water to function as groundwater supply wells. The West <br />Elk Mine's permeameter tests of the Rollins Sandstone in the permit area <br />found horizontal hydraulic conductivity values in the range 0.0001 ft/day <br />to 0.012 ft/day. <br />The Bowie sandstone, separating the Upper and Lower Coal Members, <br />may produce water locally. Information from mines operating in the <br />Lower Coal Member (i.e., Elk Creek and Bear No. 1 and No. 2 Mines) <br />indicate this formation can yield small flows of water in the area. The <br />unit crops out toward its down-gradient occurrence within the West Elk <br />permit area and there are no seeps or springs emanating from the unit, <br />demonstrating that the unit is dry in some areas. <br />The most significant reliable occurrence of groundwater in the region is <br />the alluvium of the North Fork of the Gunnison River. Significant <br />thicknesses of alluvial sand and gravel between 30 and 80 feet exist along <br />the North Fork. Numerous wells are developed in the alluvium with an <br />average yield of 17.4 gpm. A pumping test conducted by Bear Coal <br />Company on an alluvial well near the site of the Bear No. 3 Mine yielded <br />a value of 806.5 gallons/day/foot for transmissivity. <br />28
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