2018-11-15_HYDROLOGY - M1980244 ‎(6)‎

• Permit No: M1980244
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/15/2018
• Doc Name Note: Demonstration of Compliance w/WQCC's Regulation #41 - Basic Standards for GW
• Doc Name: Part 1 of 5
• From: CC&V
• To: DRMS
• Email Name: AME
• Email Name: TC1
• Email Name: MAC
• Email Name: ERR
• Email Name: JPL
• Media Type: D
• Archive: No

5.1.1 Aluminum
Table 6 presents the summary statistics for aluminum by well for the Squaw Gulch data.
Table 6. Squaw Gulch aluminum summary statistics. Reg 41 TVS denotes the Colorado Regulation 41
Table Standard Value.
SGMW- SGMW- SGMW- SGMW- SGMW- SGMW- SGMW- SGMW-
IA 1B 2A 3B 4A 4B 6B 7B
Geomean 0.78 0.30 0.29 1.60 0.06 0.21 0.33 0.12
S.D. 0.00 1.68 0.48 1.82 0.01 0.05 2.93 0.05
Max 0.78 4.94 2.09 9.55 0.07 0.26 12.10 0.18
Min 0.78 0.06 0.14 0.53 0.05 0.17 1 0.01 0.08
n 1 13 14 69 2 2 15 2
Reg 41 TVS 5.00 5.00 5.00 1 5.00 1 5.00 5.00 5.00 5.00
Aluminum data within the Squaw Gulch drainage demonstrates significant variability at the shallow
monitoring wells SGMW-1B, SGMW-3B, and SGMW-6B.
5.1.2 Arsenic
There have been no samples collected from Squaw Gulch containing arsenic in concentrations above the
minimum reporting limit.
5.1.3 Cadmium
Table 7 presents the cadmium summary statistics by well for the Squaw Gulch data.
Table 7. Squaw Gulch cadmium statistics.
SGMW- SGMW- SGMW- SGMW- SGMW- SGMW- SGMW- SGMW-
lA 1B 2A 3B 4A 4B 6B 7B
Geomean 0.003 0.000 0.001 0.003 N.D. N.D. 0.001 N.D.
S.D. 0.000 0.000 0.001 0.002 0.003
Max 0.003 0.001 0.002 0.009 0.012
Min 0.003 0.000 0.001 0.001 0.000
n 1 8 2 40 9
Reg 41 TVS 1 0.005 0.005 0.005 0.005 0.005 1 0.005 0.005 0.005
Only wells SGMW-3B and SGMW-6B have had cadmium concentrations that exceed the Reg 41 value.
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