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 8
2.1.1.2 Spring G -26a
Spring G -26a is located in Lone Pine Gulch directly north of Panel 4 in the Northwest B -Seam
historic mine area (Map 1). This spring issues from alluvium and flows into a small pond. This
spring is seasonal and historically water is only present during rising limb and peak flow
conditions. Spring G -26A has been monitored since 1980 and was undermined in May 1995.
The spring flow measurements were highly variable in the mid 1980's and 1990's, but no
measurable flows have been observed since October 1999, though the pond usually has water in
the spring and early summer months. A time -series flow graph for Spring G -26A is shown on
Figure 3.
Figure 3. Flow in Spring G -26a
Time -series water quality data from Spring G -26a do not indicate any adverse trends in water
quality. There are no baseline water quality values for this site due to insufficient flows
Insufficient flows for baseline measurements and sampling (WWE, 2001; MCC, 2016). The
laboratory ECs for the period of record are variable, ranging from 463 to 1,021 µmhos/cm and
averaging about 687 µmhos/cm. TDS values are also variable, ranging from 300 mg/L to 737
mg/L, and averaging about 444 mg/L. The field pH values for this spring over the period of
record range from 6.41 to 8.80 s.u., and average 7.66 s.u. TSS values range from ND to 74
mg/L. Dissolved iron values range from ND to 0.28 mg/L. Total iron values range from 0.18 to
4.19 mg/L, and average 0.90 mg/L. The time -series water quality graphs for Spring G -26a are
shown in Figure 4.
August 2016 HydroGeo, Inc.
Spring G -26a
Source: Above B -Seam
140
120
100
a
m
3
0
80
ILa
M
60 -
--- _-- ___---
____------------- - -___.
40
20
I�
�I
0
Jan -84 Jan -86 Jan -88
Jan -90 Jan -92 Jan -94 Jan -96 Jan -98 Jan -00 Jan -02 Jan -04 Jan -06 Jan -08 Jan -10 Jan -12 Jan -14 Jan -16
Date
Time -series water quality data from Spring G -26a do not indicate any adverse trends in water
quality. There are no baseline water quality values for this site due to insufficient flows
Insufficient flows for baseline measurements and sampling (WWE, 2001; MCC, 2016). The
laboratory ECs for the period of record are variable, ranging from 463 to 1,021 µmhos/cm and
averaging about 687 µmhos/cm. TDS values are also variable, ranging from 300 mg/L to 737
mg/L, and averaging about 444 mg/L. The field pH values for this spring over the period of
record range from 6.41 to 8.80 s.u., and average 7.66 s.u. TSS values range from ND to 74
mg/L. Dissolved iron values range from ND to 0.28 mg/L. Total iron values range from 0.18 to
4.19 mg/L, and average 0.90 mg/L. The time -series water quality graphs for Spring G -26a are
shown in Figure 4.
August 2016 HydroGeo, Inc.