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2016-12-01_PERMIT FILE - C1980007 (6)
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2016-12-01_PERMIT FILE - C1980007 (6)
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Last modified
2/1/2017 10:42:32 AM
Creation date
2/1/2017 10:41:50 AM
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DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Permit File
Doc Date
12/1/2016
Doc Name
Hydrologic Characterization of the South of the Divide
Section_Exhibit Name
Exhibit 71
Media Type
D
Archive
No
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2016 Recommended Modifications to the West Elk Mine Hydrologic Monitoring Network 22 <br />2.1.2 Raven Gulch Area Springs <br />The hydrologic monitoring network in the Raven Gulch area currently includes five springs: 24- <br />3, E-13-1, E-13-2, E-13-3, and E-13-4. <br />2.1.2.1 Spring 24-3 <br />Spring 24-3 is located in the West Flatiron drainage that is the first tributary entering Raven <br />Gulch from the west (Map 1), which is tributary to the North Fork of the Gunnison River. This <br />spring monitors the West Flatiron B -Seam longwall panels (West Flatiron mine panels area) and <br />the Box Canyon B -Seam longwall panels (Box Canyon mine panels area). This spring is located <br />about 1,000 feet to the east of the end of the B -Seam longwall Panel 21, which was mined in <br />June 2007. This spring issues from a sandstone bed above the F -Seam, flow fluctuates <br />seasonally, and is lowest in the late summer and fall months. This spring has been monitored <br />since 1998 (WWE, 2001; HydroGeo, 2016b). No baseline data were collected at this site due to <br />insufficient flows for baseline measurements and sampling (WWE, 2001; MCC, 2016). A time - <br />series flow graph for Spring 24-3 is shown on Figure 17. <br />Figure 17. Flow in Spring 24-3 <br />Spring 24-3 <br />Source: Above FSeam <br />80 <br />w <br />40E <br />a <br />3 <br />0 <br />LL <br />30 1 i <br />b <br />m <br />20- <br />1 <br />� t <br />10 <br />0 ...--T• .Ti . <br />Jan -98 Jan -00 Jan -02 Jan -04 Jan -0B Jan -08 Jan -10 ' Jan -12 Jan -14 • Jan -18 <br />Date <br />Time -series water quality data from Spring 24-3 do not indicate any adverse trends in water <br />quality. There are no baseline water quality values for this site due to insufficient flows for <br />baseline measurements and sampling (WWE, 2001; MCC, 2016). The laboratory ECs for this <br />spring for the period of record are somewhat variable, ranging from 328 to 651 µmhos/cm and <br />averaging 448 µmhos/cm. TDS values are also somewhat variable, ranging from 230 to 430 <br />mg/L, and averaging 290 mg/L. The field pH values for this spring over the period of record <br />range from 7.03 to 8.68 s.u., and average 7.97 s.u. TSS values are variable, ranging from ND to <br />304 mg/L. Dissolved iron values are variable, ranging from ND to 0.26 mg/L. Total iron values <br />are also variable, ranging from ND to 4.76 mg/L. The time -series water quality graphs for <br />Spring 24-3 are shown in Figure 18. <br />August 2016 HydroGeo, Inc. <br />
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