2021-06-14_HYDROLOGY - M1988112

• Permit No: M1988112
• IBM Index Class Name: HYDROLOGY
• Doc Date: 6/14/2021
• Doc Name: Water Monitoring - Groundwater and Surface Water
• From: Battle Mountain Resources. Inc.
• To: DRMS
• Annual Report Year: 2021
• Report Quarter_Month: May
• Email Name: LJW
• 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 05/27/2021 72.46 DRY N/A
P7 05/27/2021 92.50 92.28 0.22
P8 05/27/2021 97.51 96.60 0.91
P9 05/27/2021 72.30 71.91 0.39
P10 05/27/2021 58.30 57.61 0.69
PH 05/27/2021 41.80 41.40 0.40
P12 05/27/2021 41.71 41.66 0.05
P13 05/27/2021 41.34 41.02 0.32
P14 05/27/2021 41.24 DRY N/A
P15 05/27/2021 41.10 1 40.86 0.24
The leak detection system at the LTF Collection Pond was inspected May 27, 2021 and 860 gallons were
evacuated from the leak detection system and pumped to the LTF. The LTF underdrain system was visually
inspected May 27,2021 and the flow rate was measured to be approximately 31.0 gallons per minute(gpm).
West Pit Waste Water Treatment Plant
During the month of May 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, 7,352,100 gallons (22.6 acre-feet) of treated water was discharged to the Rito Seco and 449,500
gallons (1.38 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 May 27, 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
Nlonituring Well Identification Observation Date Depth to Water
ft
BF-4 05/27/2021 25.01
BF-511 05/27/2021 30.90
BF-6 05/27/2021 31.04
M-6 05/27/2021 DRY
M-7 05/27/2021 DRY
M-8 05/27/2021 DRY
NI-9 05/27/2021 141.52
M-10 05/27/2021 23.93
M-11R 05/27/2021 37.59
M-12 05/27/2021 174.64
M-13R 05/27/2021 125.85
M-14 05/27/2021 130.69
M-16 05/27/2021 22.40
M-17 05/27/2021 28.32