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PERMFILE60784
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PERMFILE60784
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Entry Properties
Last modified
8/24/2016 11:07:34 PM
Creation date
11/20/2007 6:51:20 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981010A
IBM Index Class Name
Permit File
Doc Date
9/8/2004
Doc Name
pages 4-1 to 4-100
Section_Exhibit Name
4.0 Protection of the Environmental & Public Resources
Media Type
D
Archive
Yes
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• Formation, as a whole, is an aquitard. However, [here are coal seams within the <br />Upper Williams Fork which have permeabilities of 15 gallons/day/ft2. The over- <br />lying Lewis Shale has low porosity and permeability, acting more as an aquiclude <br />(confining bed) than as an aquifer or an aquitard. Its permeability is estimated <br />a[ 10-5 gallons/day/ft2. The alluvial aquifer associated with the Yampa <br />River is restricted in its occurrence [o the flood plain of the river and is an <br />excellent aquifer with an estimated permeability of 500 to 5000 gallons/day/- <br />ft2. <br />Peizome[er studies conducted by Radian indicate [hat vertical cross bedding I <br />groundwater flow occurs and that an up-section flow component develops to the <br />north and west of the mine. However, this up-section flow component does not <br />exist between the Yampa River alluvium and [he Upper Williams Fork (Settergren, <br />1979-Appendix N). <br />Depths [o groundwater from the land surface are variable from about 120 to 250 <br />feet in the Upper [Jilliams Fork which includes the coal seams mined at the Trap- <br />per Mine. Using data from wells constructed for the Radian studies and assuming a <br />ermeabilit of 50 ~ <br />p y gallons/day/ft` and a porosity of 0.2, estimated groundwater <br />velocity within the Twenty Mile Sandstone is about 0.6 ft/day. Actual velocities <br />in the Upper Williams Fork are much lower. <br />The general quality of groundwater in the Trapper Atine area appears to be good. <br />Total dissolved solids for all wells is less [h an 100 mg/l, which means that the <br />water is classed as fresh in the U.S. Geological Survey classification. The <br />water is relatively hard, containing significant quantities of calcium bicarbon- <br />ate and sulfate. Concentrations of minor and trace elements in the groundwater <br />are low. However, concentrations of lead, selenium, and arsenic are a[ or above <br />National Interim Primary Drinking Water Standards (NIPDSW) in some wells. For <br />the proposed National Secondary Drinking Water Regulations (NSDWR) iC appears <br />[ha[ both iron and molybdenum exceed the limits. Concentrations of copper and <br />molybdenum exceed the NAS/NAE recommended limits Eor continuously-used irrigation <br />water. <br /> <br />4-92 <br />
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