2019-11-15_HYDROLOGY - M1988112

• Permit No: M1988112
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/15/2019
• Doc Name: Water Level Monitoring
• From: Battle Mountain
• To: DRMS
• Annual Report Year: 2019
• Report Quarter_Month: Oct
• 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 10/31/2019 72.46 DRY N/A
P7 10/31/2019 92.50 92.29 0.21
P8 10/31/2019 97.51 96.70 0.81
P9 10/31/2019 72.30 71.89 0.41
P10 10/31/2019 58.30 57.57 0.73
I'll. 10/31/2019 41.80 41.39 0.41
P12 10/31/2019 41.71 41.68 0.03
P13 10/31/2019 41.34 41.03 0.31
P14 1 10/31/2019 1 41.24 DRY I N/A
P15 1 10/31/2019 1 41.10 40.86 1 0.24
The leak detection system at the TSF Collection Pond was inspected October 31, 2019. A total of 850
gallons (27.4 GPD) were evacuated from the leak detection system and pumped to the LTF. The LTF
underdrain system flow was measured to be approximately 34.5 gallons per minute(gpm).
West Pit Waste Water Treatment Plant
During the month of October 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 October, 7,108,200 gallons(21.8 acre-feet) of treated
water was discharged to the Rito Seco. There was 231,000 gallons (0.71 acre-feet) of water transferred
from the West Pit to the LTF in October 2019. There was no sludge transferred from the water treatment
plant drying pad to the LTF.
BMRI performed the monthly visual seepage expression inspections on October 31, 2019 in the historic
seepage area identified in Figure 2 of the permit. No seepage expressions were observed in the historic
seepage area during October 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 10/31/2019 24.86
BF-511 10/31/2019 30.78
BF-6 10/31/2019 30.91
M-6 10/31/2019 DRY
M-7 10/31/2019 DRY
M-8 10/31/2019 DRY
M-9 10/31/2019 141.79
M-10 10/31/2019 25.38
M-11 R 10/31/2019 38.38
M-12 10/31/2019 175.12
M-13R 10/31/2019 126.13
M-14 10/31/2019 131.12
M-15 10/31/2019 90.93
M-16 10/31/2019 22.93
M-17 10/31/2019 30.58
M-18 10/31/2019 26.55