2017-04-28_REPORT - C1981038 (4)

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remaining wells were also monitored during the second quarter for water levels, field parameters and water quality. SM -7 is within the projected angle -of -draw of mine workings. Water levels from the five Roatcap Creek colluvial wells continued to show typical seasonal variability with water levels elevated in the spring and lower at the end of the year. No anomalies or impacts on water levels were observed in 2016 at these wells. Wells SM -05, 06, 07,10 and 11 were permanently suspended with the approval of TR -61 and will no longer be part of the monitoring program. Steven's Gulch Colluvium Groundwater Monitoring Wells: Shallow groundwater monitoring wells, SM -1 and SM -9 (see Map No. 4-1) are in the Steven's Gulch drainage. The wells are monitored for water quality parameters, water levels, and field parameters to detect impacts associated with mining in the central pod. Required monitoring for wells SM -1 and SM -9 was semi-annually during 2016 for water levels and field parameters when water is available. Well SM -1 is next to areas mined in 1991 and 1992 but has showed no apparent impacts the data collected since that time. Well SM -9 was undermined by Panel C during 1993 but has showed no apparent impacts in the data collected since that time. No anomalous water quality observations were apparent during 2016 at the Stevens Gulch shallow groundwater monitoring wells. The monitoring technician only monitored these wells one time during the year because the wells have been permanently suspended with the approval of TR -61 and will no longer be part of the monitoring program. Surface Water Monitoring Stations - SPRINGS East Roatcap Creek - Two springs were monitored in the East Roatcap Creek drainage (refer to Table 1 and Map No. 4-1) during the year. Spring 30 had flow during May and June and was dry the remainder of the year. Spring 30 was first undermined in April 1983. Spring 10-10 had flow during May, and then was dry during the reporting period. Spring 10-10 was encompassed by the angle -of -draw of Panel Y during October 1993. Subsidence impacts were not apparent at either of these locations during 2016. West Roatcap Creek- Two springs were monitored in the West Roatcap Creek drainage (refer to Table 1 and Map No. 4-1) during the year. Spring 32 was monitored quarterly during the year. Spring 32 exhibited flows that were below or near average. Water quality parameters were consistent with prior years sampling. Spring 32 has been permanently suspended with the approval of TR -61 and will no longer be part of the monitoring program. Spring 14-4 was monitored quarterly and had flow during May, and had enough water to measure parameters during September. The Spring was dry the remainder of the year. No mining occurred during the year in the Spring14-4 watershed. Stevens Gulch - One spring was monitored within the Stevens Gulch drainage (refer to Table 1 and Map No. 4-1) during the year. Spring 25 lies below an area of the East mine inactive since 1982. This site had no measurable flows during the year. Spring 25 has been identified as an adjudicated water right within the permit area. Two springs with ponds in the Stevens Gulch drainage, Spring and Pond 13-5, Spring and Pond 13-6 were monitored quarterly during the year. Spring and Pond 13-5 was undermined during the last half of 1992. Spring and Pond 13-6 was undermined during the end of 1988. Spring 13-5 was dry during the year. Spring 13-6 had no measurable flows during the year. Surface Water Monitoring Stations: STREAMS AND DITCHES Overall, adverse impacts attributable to mining were not evident at any of the monitored surface water stations (refer to Table 1 and Map No. 4-1). Stations SW -5 (Stevens Gulch) had average or slightly above average flow and was dry during the July through November monitoring events. SW -6 (East Roatcap Creek) had average flows and was damp during the October monitoring event. No evidence of subsidence impacts in these drainages was apparent. Mining occurred in the Stevens Gulch drainage upstream of site SW -5 during 1993 in Panel C. Panel C mining was designed and conducted to prevent the development of subsidence to protect the waterway and certain structures in the vicinity. Data collected during the year shows these protective measures were successful. 3