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GENERAL39503
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Last modified
8/24/2016 7:58:56 PM
Creation date
11/23/2007 10:12:24 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981008
IBM Index Class Name
General Documents
Doc Date
3/15/1998
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR RN3
Permit Index Doc Type
Findings
Media Type
D
Archive
No
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The Dakota coal has been described as an aquifer. Wells completed in the Dakota show water level <br />fluctuations of 1.3 to 14.6 feet. The water table exhibits seasonal fluctuations with high water levels <br />in late fall. The aquifer is recharged fro[n the east north east and discharges to the west and along <br />Calamity Draw. The transmissivity varies from 0.92 to 6.0 ft'/day, based on hydraulic conductivity <br />values of 0.04 to 0.34 ft/day (average values of 0.19 ft/day), reflecting moderate flow capabilities. <br />The water quality of the Dakota coal is unacceptable for most uses. The saline, sulfate-based water <br />has TDS levels varying from 1050-4444 mg/l, averaging 2822 mg/l at New Horizon Mine. Three <br />wells at the New Horizon Mine 2 exhibit two distinct geochemical characteristics. Two wells have <br />calcium/magnesiumsulfafe water with the pH averaging 5.4. One well, 17-P1, is an alkaline sodium <br />sulfate water with the pH averaging 9.2. Iron, manganese, aluminum, fluoride and pH levels exceed <br />recommended water quality criteria for agricultural ttse, and concentrations of aluminum and fluoride <br />exceed recommended water quality criteria for livestock. <br />The aquifer underlying the coal is identified as the underburden aquifer. The wells in the underburden <br />have been completed 17 to 64 feet below the coal, and samples are representative of water within the <br />lower Dakota Sandstone. This confined aquifer is recharged along the Uncompahgre Plateau to the <br />northeast and discharges towards the southwest. Transmissivity was measured at six sites and varies <br />from 3.0 to 88 ftZ/day, averaging 38 ft-/day. Hydraulic conductivity values varied from 0.07 to 4,5 <br />ft/day, averaging 1.6 ft/day. This aquifer is not used locally to any great extent. <br />The water in the underburden is characterized as a hard, moderately alkaline saline water with high <br />sulfate concentrations (average sulfate concentrations of 695 mg/1). Two wells show a <br />calcium magnesium sulfate type water while one well shows an alkaline sodium bicarbonate type <br />water. The TDS varies from 960-2648 mg/l, averaging 1619 mg/1. Dissolved iron levels vary from <br />0.02 to 2.51 mgll and average 0.63 mg/l. The sodium bicarbonate well occasionally exhibits pH levels <br />which exceed the recommended agricultural standazd. Another well shows manganese levels which <br />exceed the agricultural standards. All wells meet the recommended water quality standards for <br />livestock watering. The underburden aquifer does not produce acceptable water for domestic <br />purposes: TDS, sulfate and ammonia standards are exceeded. <br />Ground water within 150 feet of the ground surface has been only minimally developed for use in the <br />Nucla area. High salinities and occasionally high sodium or sulfate concentrations preclude its use <br />as domestic, agricultural or stock water. In addition, moderate hydraulic conductivities are coupled <br />with low sustained well yields (less than 1.5 gpm), discouraging sustained dependence on wells <br />completed within these aquifers. T <br />~o~ K ~.T- Gw ~ ~. <br />sous <br />There are three major soils types at the New Horizon Mine 2 area (see Soils Map of the permit <br />application): Progresso-Bond Complex, 2 [0 15 percent slopes; Barx sandy loam, 1 to 4 percent <br />slopes; and Haplaquolls, 1 to 3 percent slopes. <br />The Progresso-Bond complex is comprised of 40 percent Progresso, 40 percent Bond, 10 percent <br />Barx (see below), 5 percent Travesilla, and 5 percent Bowdish series soils. The Progresso series is <br />classified as afine-loamy, mixed, mesic, Ustollic Haplargid. The Bond series is a loamy, nuxed, mesic <br />
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