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

5.2.4 Copper
Table 27 presents the summary statistics for copper by well for the Arequa Gulch data.
Table 27. Arequa Gulch copper statistics
CRMW- CRMW- CRMW- CRMW- CRMW- CRMW- CRMW- CRMW- CRMW-
2A 2B 3A 3B 3C 5A 5B 5C 5D
Geomean 0.027 0.111 0.006 0.006 N.D. N.D. 0 005 N.D. N.D.
S.D. 0.027 0.109 0.001 0.001 0.000
Max 0.120 0.499 0.010 0.008 0.005
Min 0.008 0.039 0.005 0.005 0.005
n 46 42 22 6 1
Reg 41 TVS 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20
Monitoring well CRMW-2B has recorded data above the Reg 41 value of 0.2 mg/L.
5.2.5 WAD Cyanide
Table 28 presents the summary statistics for WAD cyanide by well for the Arequa Gulch data.
Table 28. Arequa Gulch WAD cyanide statistics
CRMW- CRMW- CRMW- CRMW- CRMW- CRMW- CRMW- CRMW- CRMW-
2A 2B 3A 3B 3C 5A 5B 5C 5D
Geomean 0.02 N.D. 0.01 0.01 N.D. N.D. N.D. N.D. N.D.
S.D. 0.00 0.02 0.00
Max 0.02 0.09 0.02
Min 0.02 0.01 0.01
n 1 32 24
Reg 41 TVS 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20
All recorded WAD cyanide data within Arequa Gulch has been below the approved DRMS NPL of 0.2
mg/L. The state of Colorado Reg 41 value is for [free] cyanide.
5.2.6 Fluoride
Table 29 presents the summary statistics for fluoride by well for the Arequa Gulch data.
Table 29. Are ua Gulch fluoride statistics
CRMW- CRMW- CRMW- CRMW- CRMW- CRMW- CRMW- CRMW- CRMW-
2A 2B 3A 3B 3C 5A 5B 5C 5D
Geomean 1.79 0.64 5.40 3.97 1.97 1.90 2.78 3.44 4.10
S.D. 0.60 0.29 2.00 0.92 0.30 0.00 1.05 0.65 0.48
Max 3.10 1.41 12.20 9.90 2.64 1.90 3.71 4.88 4.89
Min 0.70 0.29 3.07 2.79 1.29 1.90 0.53 2.24 3.42
n 46 37 119 147 20 1 10 14 9
Reg 41 TVS 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00
Monitoring wells CRMW-2A, CRMW-3A, CRMW-3B, CRMW-5B, CRMW-5C, and CRMW-513 have
recorded fluoride data above the Reg 41 value of 2.0 mg/L.
23