2022-03-15_HYDROLOGY - M1988112

• Permit No: M1988112
• IBM Index Class Name: Hydrology
• Doc Date: 3/15/2022
• Doc Name: Water Monitoring - Groundwater and Surface Water
• From: Battle Mountain Resources, Inc
• To: DRMS
• Annual Report Year: 2022
• Report Quarter_Month: Feb
• Email Name: LJW
• Email Name: THM
• Media Type: D
• Archive: No

Table 2-Monthly Piezometer Elevations
Monitoring Well Piezometer Depth Depth to Water Depth of Water
Identification Observation Date ft ft ft
P6 02/28/2022 72.46 DRY N/A
P7 02/28/2022 92.50 92.27 0.23
P8 02/28/2022 97.51 96.58 0.93
P9 02/28/2022 72.30 71.92 0.38
P10 02/28/2022 58.30 57.46 0.84
I'll 02/28/2022 41.80 41.41 0.39
P12 02/28/2022 41.71 41.65 0.06
P13 02/28/2022 41.34 41.02 0.32
1`14 1 02/28/2022 1 41.24 1 DRY I N/A
P 15 1 02/28/2022 1 41.10 1 40.86 1 0.24
The leak detection system at the LTF Collection Pond was inspected February 28, 2022 and 890 gallons
were evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was
visually inspected February 28,2022 and the flow rate was measured to be approximately 31.5 gallons per
minute(gpm).
West Pit Waste Water Treatment Plant
During the month of February 2022, 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, 5,892,400 gallons (18.1 acre-feet) of treated water was discharged to the Rito Seco and 345,100
gallons (1.06 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 in February.
BMRI performed the monthly visual seepage expression inspections on February 28, 2022 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
ft
BF-4 02/28/2022 24.88
BF-5R 02/28/2022 30.80
BF-6 02/28/2022 30.95
M-6 02/28/2022 DRY
M-7 02/28/2022 DRY
M-8 02/28/2022 DRY
M-9 02/28/2022 141.59
M-10 02/28/2022 24.50
M-11 R 02/28/2022 39.19
M-12 02/28/2022 174.61
M-13R 02/28/2022 125.83
M-14 02/28/2022 130.66
M-16 02/28/2022 23.83
M-17 02/28/2022 30.32