2021-04-12_HYDROLOGY - M1988112

• Permit No: M1988112
• IBM Index Class Name: HYDROLOGY
• Doc Date: 4/12/2021
• Doc Name: Water Level Monitoring
• From: Battle Mountain Resources, Inc.
• To: DRMS
• Email Name: LJW
• Media Type: D
• Archive: No

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Table 2-Monthly Piezometer Elevations
Monitoring Well Piezometer Depth Depth to Water Depth of Water
Identification Observation Date ft ft ft
P6 03/31/2021 72.46 DRY N/A
P7 03/31/2021 92.50 92.28 0.22
P8 03/31/2021 97.51 96.61 0.90
P9 03/31/2021 72.30 71.91 0.39
P10 03/31/2021 58.30 57.61 0.69
Pit 03/31/2021 41.80 41.40 0.40
P12 03/31/2021 41.71 41.67 0.04
P13 03/31/2021 41.34 41.02 0.32
P14 03/31/2021 41.24 DRY N/A
P15 03/31/2021 41.10 1 40.86 1 0.24
The leak detection system at the LTF Collection Pond was inspected March 31,2021 and 940 gallons were
evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was visually
inspected March 31, 2021 and the flow rate was measured to be approximately 30.5 gallons per minute
(gpm)•
West Pit Waste Water Treatment Plant
During the month of March 2021, the West Pit Waste Water Treatment Plant (WWTP) was operated
intermittently (3 to 4 days per week) under Colorado Department of Public Health and Environment
(CDPHE) CDPS Permit No. C00045675 for discharge into the Rito Seco alluvial aquifer. During the
month, 7,313,100 gallons (22.4 acre-feet) of treated water was discharged to the Rito Seco and 116,800
gallons (0.36 acre-feet) of water was transferred from the West Pit to the Lined Tailing Facility (LTF).
Additionally, no water was reinfiltrated into the West Pit and there was no sludge transferred from the
WWTP drying pad to the LTF.
BMRI performed the monthly visual seepage expression inspections on March 31, 2021 in the historic
seepage area identified in Figure 2 of the permit. No seepage expressions were observed in the historic
seepage area.
BMRI measured the monthly West Pit backfill, alluvial and monitoring wells as required under in the
QA/QC Plan. Measurements obtained for the monthly wells are shown in Table 3.
Table 3-Monthly and Quarterly Groundwater Depth to Water
Monitoring Well Identification Observation Date Depth to Water
R
BF-4 03/31/2021 24.85
BF-5R 03/31/2021 30.78
BF-6 03/31/2021 30.88
M-6 03/31/2021 DRY
M-7 03/31/2021 DRY
M-8 03/31/2021 DRY
M-9 03/31/2021 141.31
M-10 03/31/2021 24.18
M-11 R 03/31/2021 38.06
M-12 03/31/2021 174.31
M-13R 03/31/2021 125.38
M-14 03/31/2021 130.65
M-16 03/31/2021 23.85
M-17 03/31/2021 29.91