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GENERAL46097
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GENERAL46097
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Last modified
8/24/2016 8:17:06 PM
Creation date
11/23/2007 2:20:28 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980005
IBM Index Class Name
General Documents
Doc Date
12/6/2002
Doc Name
Proposed Decision & Findings of Compliance for RN4
Permit Index Doc Type
Findings
Media Type
D
Archive
No
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is because of the relatively impermeable (confining) nature of the intervening strata. <br />For this reason, each aquifer will be discussed as a sepazate entity. <br />Trout Creek Sandstone <br />The Trout Creek Sandstone is stratigraphically 70 feet below the Wolf Creek Coal. <br />This 120 foot thick sandstone body is thought to be a significant source of ground <br />water in this region. <br />Water from the Trout Creek Sandstone is used to supply the Seneca II Mine <br />facilities. As the supply well is frequently pumped, reliable depth-to-water <br />information is not available from this site. The Trout Creek Sandstone water is a <br />sodium sulfate type with an average TDS concentration in the range of 900 mg/1. <br />The 70 feet of interbedded sandstone, siltstone, coal and shale act as a confining unit <br />which essentially precludes the vertical migration of water between the Trout Creek <br />Sandstone and the Wolf Creek Coal. Consequently no depletion or degradation of <br />water in this aquifer is anticipated as a result of mining operations at the Seneca II <br />Mine. <br />Wolf Creek Coal <br />The Wolf Creek Coal seam is capable of transmitting and storing small amounts of <br />water. Aquifer tests of the unit were performed at the Seneca II-W Mine site, about <br />5 miles west of Seneca II Mine, in 1980. These tests indicate that the Wolf Creek <br />Coal is a confined aquifer which transmits limited amounts of water. One well was <br />pumped at an average of 1.2 gallons per minute for about 3 '/z hours and produced no <br />observable drawdown at an observation we1120 feet away. Transmissiviry values <br />calculated for We Wolf Creek Coal vary between 0.02 ft per day (0.149 gallons per <br />day per foot) for we113 WC and 0.001 ftz per day (0.007 gallons per day per foot) in <br />the two wells tested. Due to the low water yield and transmissivity values, the <br />storativiry value of the Wolf Creek Coal is estimated to be about 1 X 10"S. Both <br />transmissiviry and storativity appeaz to be quite low due to the highly lenticulaz and <br />discontinuous nature of the Mesaverde Group. It is thought that transmissivity and <br />storativiry values will be vaziable over lazge areas. <br />Two wells remain that are monitored for water level, S 10-WC and S 15-WC, both of <br />which aze up-gradient of the mining operation. Water in both these wells retained a <br />relatively uniform level throughout the early years of mine life. S10-WC level <br />varied azound 79 feet below ground surface (bgs). After 1989, the levels have <br />dropped and appear to have stabilized azound 83 feet bgs. S 15-WC levels vazied <br />around 80 feet bgs until 1993, at which time levels have been erratic, ranging from <br />84 feet bgs to 108 feet bgs. <br />18 <br />
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