2019-04-16_HYDROLOGY - M1988112

• Permit No: M1988112
• IBM Index Class Name: HYDROLOGY
• Doc Date: 4/16/2019
• Doc Name: Water Monitoring - Groundwater and Surface Water
• From: Battle Mountain
• To: DRMS
• Annual Report Year: 2019
• Report Quarter_Month: Mar
• 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 fr ft
P6 03/29/2019 72.46 DRY N/A
P7 03/29/2019 92.50 92.30 0.20
P8 03/29/2019 97.51 96.67 0.84
P9 03/29/2019 72.30 71.93 0.37
P10 03/29/2019 58.30 57.57 0.73
PH 03/29/2019 41.80 41.39 0.41
P12 03/29/2019 41.71 41.68 0.03
P13 03/29/2019 41.34 41.04 0.30
P14 03/29/2019 41.24 DRY N/A
P15 1 03/29/2019 1 41.10 1 40.86 0.24
The leak detection system at the TSF Collection Pond was inspected March 29,2019. A total of 870 gallons
(30.0 GPD)were evacuated from the leak detection system and pumped to the LTF. The LTF underdrain
system flow was measured to be approximately 32.5 gallons per minute(gpm).
West Pit Waste Water Treatment Plant
During the month of March 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 March, 6,544,500 gallons (20.08 acre-feet) of treated
water was discharged to the Rito Seco and 367,200 gallons (1.13 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.
BMRI performed the monthly visual seepage expression inspections on March 28, 2019 in the historic
seepage area identified in Figure 2 of the permit. No seepage expressions were observed in the historic
seepage area during March 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
BF-4 03/29/2019 24.90
BF-5R 03/29/2019 30.82
BF-6 03/29/2019 30.93
M-6 03/29/2019 DRY
M-7 03/29/2019 DRY
M-8 03/29/2019 DRY
M-9 03/29/2019 141.43
M-10 03/29/2019 25.36
M-11R 03/29/2019 38.86
M-12 03/29/2019 174.79
M-13R 03/29/2019 125.86
M-14 03/29/2019 130.91
M-15 03/29/2019 90.33
M-16 03/29/2019 23.42
M-17 03/29/2019 30.26
M-18 03/29/2019 26.65
M-19 03/29/2019 23.84