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 16
2.1.1.6 Spring G-35 (Decreed Spring #18)
Spring G-35 is located on the north flank of Jumbo Mountain in an unnamed drainage west of
Gribble Gulch which is tributary to the North Fork of the Gunnison River. This spring is situated
north of Panel 8 in the Northwest B -Seam historic mine area (Map 1). This spring issues from
alluvium and flows into a holding pond which has water during wet climatological cycles.
Spring G-35 has been monitored since 1993 and was undermined in the summer of 1995. The
spring flow measurements have been variable over time because of climatological changes, but
show no trends. A time -series flow graph for Spring G-35 is shown on Figure 11.
Figure 11. Flow in Spring G-35
Time -series water quality data from Spring G-35 do not indicate any adverse trends in water
quality. The laboratory ECs for this spring for the period of record are variable, ranging from
974 to 1,330 µmhos/cm and averaging 1,179 µmhos/cm. In comparison, the baseline laboratory
EC values range from 1,030 to 1,130 µmhos/cm. TDS values for this spring for the period of
record are also variable, ranging from 630 to 890 mg/L, and averaging 774 mg/L, compared to
baseline values ranging from 598 to 974 mg/L. There are no baseline values for field pH for this
site (WWE, 2001) for comparison; however, baseline certified laboratory pH data are available
for comparison. The field pH values for this spring over the period of record are variable,
ranging from 6.61 to 8.30 s.u., and averaging 7.71 s.u. In comparison, the baseline laboratory pH
values range from 7.7 to 7.8 s.u. TSS values for the period of record range from ND to 170
mg/L, compared to a baseline maximum of 16 mg/L. Dissolved iron values range from ND to
0.19 mg/L, compared to a maximum baseline value of 0.03 mg/L. Total iron values range from
ND to 1.55 mg/L, compared to a maximum baseline value of 1.2 mg/L. The time -series water
quality graphs for Spring G-35 are shown in Figure 12.
August 2016 HydroGeo, Inc.
Spring G-35
Source: Above B -Seam
>o -
25
E
Q
20
3
0
LL
N
R
61
�
10
__ .. _. ..... _.....
5
0
Jan -93 Jan -95 Jan -97
Jan -99 Jan -01 Jan -03 Jan -05 Jan -07
Jan -09 Jan -11 Jan -13 Jan -15
Date
Time -series water quality data from Spring G-35 do not indicate any adverse trends in water
quality. The laboratory ECs for this spring for the period of record are variable, ranging from
974 to 1,330 µmhos/cm and averaging 1,179 µmhos/cm. In comparison, the baseline laboratory
EC values range from 1,030 to 1,130 µmhos/cm. TDS values for this spring for the period of
record are also variable, ranging from 630 to 890 mg/L, and averaging 774 mg/L, compared to
baseline values ranging from 598 to 974 mg/L. There are no baseline values for field pH for this
site (WWE, 2001) for comparison; however, baseline certified laboratory pH data are available
for comparison. The field pH values for this spring over the period of record are variable,
ranging from 6.61 to 8.30 s.u., and averaging 7.71 s.u. In comparison, the baseline laboratory pH
values range from 7.7 to 7.8 s.u. TSS values for the period of record range from ND to 170
mg/L, compared to a baseline maximum of 16 mg/L. Dissolved iron values range from ND to
0.19 mg/L, compared to a maximum baseline value of 0.03 mg/L. Total iron values range from
ND to 1.55 mg/L, compared to a maximum baseline value of 1.2 mg/L. The time -series water
quality graphs for Spring G-35 are shown in Figure 12.
August 2016 HydroGeo, Inc.