2019-05-21_HYDROLOGY - M1988112

• Permit No: M1988112
• IBM Index Class Name: HYDROLOGY
• Doc Date: 5/21/2019
• Doc Name: Water Level Monitoring
• From: Battle Mountain
• To: DRMS
• Annual Report Year: 2018
• Report Quarter_Month: Apr
• Email Name: LJW
• Media Type: D
• Archive: No

Table 2-Monthly Piezometer Elevations
Monitoring Well Date Piezometer Depth Depth to Water Depth of Water
Identification Observation B B ft
P6 04/30/2019 72.46 DRY N/A
P7 04/30/2019 92.50 92.29 0.21
P8 04/30/2019 97.51 96.67 0.84
P9 04/30/2019 72.30 71.90 0.40
P10 04/30/2019 58.30 57.58 0.72
I'll 04/30/2019 41.80 41.39 0.41
P12 04/30/2019 41.71 41.67 0.04
P13 04/30/2019 41.34 41.03 0.31
P14 04/30/2019 41.24 DRY N/A
P15 04/30/2019 41.10 40.86 0.24
The leak detection system at the TSF Collection Pond was inspected April 30,2019. A total of 860 gallons
(26.9 GPD)were evacuated from the leak detection system and pumped to the LTF. The LTF underdrain
system flow was measured to be approximately 31.5 gallons per minute(gpm).
West Pit Waste Water Treatment Plant
During the month of April 2019, the West Pit Water Treatment Plant was operated under Colorado
Department of Public Health and Environment(CDPHE)CDPS Permit No. C00045675 for discharge into
the Rito Seco alluvial aquifer. During the month of April, 8,112,900 gallons (24.90 acre-feet) of treated
water was discharged to the Rito Seco and 464,400 gallons (1.43 acre-feet) of water transferred from the
West Pit to the LTF. There was no sludge transferred from the water treatment plant drying pad to the LTF.
BMRl performed the monthly visual seepage expression inspections on April 30, 2019 in the historic
seepage area identified in Figure 2 of the permit. No seepage expressions were observed in the historic
seepage area during April 2019.
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
BF4 04/30/2019 24.83
BF-5R 04/30/2019 30.75
BF-6 04/30/2019 30.84
M-6 04/30/2019 DRY
M-7 04/30/2019 DRY
M-8 04/30/2019 DRY
M-9 04/30/2019 141.33
M-10 04/30/2019 25.13
M-11 R 04/30/2019 39.52
M-12 04/30/2019 174.73
M-13R 04/30/2019 125.73
M-14 04/30/2019 130.88
M-15 04/30/2019 90.36
M-16 04/30/2019 22.50
M-17 04/30/2019 29.34
M-18 04/30/2019 25.59
M-19 04/30/2019 22.95