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2010-06-04_PERMIT FILE - C1982056A (8)
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2010-06-04_PERMIT FILE - C1982056A (8)
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Last modified
8/24/2016 4:12:47 PM
Creation date
10/14/2010 10:11:05 AM
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Template:
DRMS Permit Index
Permit No
C1982056A
IBM Index Class Name
Permit File
Doc Date
6/4/2010
Section_Exhibit Name
2.04 Environmental Resources
Media Type
D
Archive
Yes
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Characteristics of the overburden aquifer determined for specific monitoring wells in the permit and adjacent <br />areas are summarized in Exhibit 9, Aquifer Test Data. The highest hydraulic conductivity values for the <br />overburden aquifer (0.4 to 0.86 ft/day) were calculated from pumping test data (Well FBR -1 and FBR -4). <br />• Pumped well data from Exhibit 9 indicate that the Wadge Overburden aquifer has an average permeability <br />ranging from 0.11 to 0.32 ft/day, which is consistent with the low- yields observed in the monitoring wells. <br />Alluvial Aquifers <br />The locations of significant alluvial deposits in the Foidel Creek drainage in the vicinity of the permit area are <br />shown on Map 15, Alluvial Valley Floors and Surface Water Rights. <br />A cross - section through the alluvial sediments near the confluence of Foidel and Middle Creeks is presented as <br />Figure 6T. <br />Ground Water Oualit <br />The discussion of ground water quality will be limited to the aquifer units, which influence, or may be <br />potentially affected by, the proposed mining operations. As shown by Exhibit 14, Hydrologic Monitoring, a <br />number of ground water monitoring wells are completed in the significant aquifers of the Twentymile Park <br />Basin in the permit and adjacent areas. Ground water levels and quality in some of these wells have been <br />monitored since 1979. <br />Bedrock Aquifers <br />Water quality data from Well 001 -83 -106 indicates that the Trout Creek Sandstone aquifer baseline water <br />quality is of sodium - bicarbonate type, with moderate sulfate concentrations and very low concentrations of <br />• calcium and magnesium. Total dissolved solids concentrations are in the range of 822 to 876 mg /l and pH <br />ranges between 8.7 to 9.0 units. Water quality in Well 001 -83 -107 is similar to water quality in Well 001 -83- <br />106. <br />Known Uses of Ground Water <br />A review of the Colorado State Engineers' records indicates the existence of several adjudicated wells within the <br />general vicinity of the Permit Area. The wells are located within approximately a 2 -mile radius of the permit <br />area (Table 9, Summary of Ground Water Rights). The location and completion information for these wells was <br />examined to ascertain whether there is any potential for adverse impacts as a result of the proposed mining <br />operations. <br />The quality data from the Wadge Overburden wells indicate that ground water in this aquifer is characteristically <br />of a sodium - bicarbonate type, with relatively low concentrations of calcium, magnesium, and sulfate. Total <br />dissolved solids concentrations are typically in the range of 400 to 2042 mg /l and pH concentrations are 8.3 <br />units (Well FBR -11A). The four wells presently monitored under this permit as Wadge Overburden Wells (009- <br />79-4, 006- 82 -74C, 91M006, and FBR -11 -A) have an average total dissolved solids concentration of 1,952 mg /l <br />and an average pH of 8.02. The average changes to 1,588 mg /l total dissolved solids and a pH of 8.18 units, if <br />monitoring Well 006 -82 -74C (located near the portal area) is excluded from the group. For monitoring Well <br />026 -79 -4, which is farther upgradient and outside the permit area, total dissolved solids concentration ranges <br />from 384 to 1,510 mg /1, averaging 673 mg /l over the period from 1979 to 1993. The average pH value for this <br />Well is 7.98 units for the period 1979 to 1993. <br />RN08 -05 2.04 -42 03/12/10 <br />
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