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 30
Note: No baseline field or laboratory water quality data because this site was initially monitored voluntarily (HydroGeo, 2016b)
prior to officially being added to the monitoring network in 2005 (CDRMS, 2006)
Not Detected (ND) values graphed as zero.
2.1.2.5 Spring E-13-4
Spring E-13-4 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 1,400 feet to the east-southeast of the end of the B -
Seam longwall Panel 20, which was mined in November 2006. This spring issues from
sandstone beds above the F -seam, and flows are 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 25.
Figure 25. Flow in Spring E-13-4
Spring E-13-4
Source: Above F -Seam
40
35
30 _.. ___- _-- --..... _
E
Q
rn
3 25
0
LL
a
PO__.... _ _._.... __._...----- .I.._._._f _..
(n
m
m
2
15
10 �._......�.---...:.._-_.
5
0
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-13-4 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 (HydroGeo, 2016b) prior to being officially added to the
monitoring network in 2005 (CDRMS, 2006). The laboratory ECs for this spring for the period
of record are steady, ranging from 291 to 454µmhos/cm and averaging 381 µmhos/cm. TDS
values are also steady, ranging from 200 to 310 mg/L, and averaging 249 mg/L. The field pH
values for this spring over the period of record range from 6.53 to 8.61 s.u., and average 7.68 s.u.
TSS values are variable, ranging from ND to 170 mg/L. Dissolved iron values are generally low,
August 2016 HydroGeo, Inc.