2016-12-01_PERMIT FILE - C1980007 ‎(6)‎

• 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

2016 Recommended Modifications to the West Elk Mine Hydrologic Monitoring Network 28
Note: No baseline field or laboratory water quality data because the site was initially monitored voluntarily prior to officially
being added to the monitoring network in 2005 (HydroGeo, 2016b).
Not Detected (ND) values graphed as zero.
2.1.2.4 Spring E-13-3
Spring E-13-3 is located in the lower West Flatiron drainage that is the first tributary entering
Raven Gulch from the west, (Map 1) which is tributary to the North Fork of the Gunnison River.
This spring was also monitored for the West Flatiron mine panels area and the Box Canyon mine
panels area. This spring is located about 1,500 feet to the east-southeast of the end of the B -
Seam longwall Panel 19, which was mined in March 2006. This spring issues from sandstone
beds above the F -seam, and flows are highly variable, typically diminishing significantly in the
late summer months. This spring was intermittently monitored voluntarily between 2002 and
2004 (HydroGeo, 2016b), and was officially added to the WEM monitoring network in WY
2005 (CDRMS, 2006). A time -series flow graph for Spring E-13-3 is shown on Figure 21.
Figure 23. Flow in Spring E-13-3
Spring E-13-3
Source: Above F -Seam
120
a e
3
0
LL
a
60
N
R
40 __- --_.- -----
20
0
V
Jan -02 Jan -03 Jan -04 Jan -05 Jan -06 Jan -07 Jan -08 Jan -09 Jan -10 Jan -11 Jan -12 Jan -13 Jan -14 Jan -15 Jan -16
Date
Time -series water quality data from Spring E-13-3 do not indicate any adverse trends in water
quality. There are no baseline field or laboratory water quality values for this site because it was
initially monitored voluntarily between 2002 and 2004 (HydroGeo, 2016b) prior to being
officially added to the WEM monitoring network in 2005 (CDRMS, 2006). The laboratory ECs
for this spring for the period of record are relatively steady, ranging from 315 to 571 µmhos/cm
and averaging 457 µmhos/cm. TDS values are slightly more variable, ranging from 160 to 360
mg/L, and averaging 292 mg/L. The field pH values for this spring over the period of record
range from 6.49 to 8.50 s.u., and average 7.54 s.u. TSS values are low, ranging from ND (8 of
11 values) to 16 mg/L. Dissolved iron values are also low, ranging from ND (8 of 12 values) to
August 2016 HydroGeo, Inc.