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Steven's Gulch Colluvium Groundwater Monitoring Wells: <br />Shallow groundwater monitoring wells, SM -1 and SM -9 (see Map No. 4-1) are in the Steven's Gulch drainage. <br />The wells are monitored for water quality parameters, water levels, and field parameters to detect impacts <br />associated with mining in the central pod. Required monitoring for wells SM -1 and SM -9 was semi-annually <br />during 2015 for water levels and field parameters when water is available. Well SM -1 is next to areas mined in <br />1991 and 1992 but has showed no apparent impacts the data collected since that time. Well SM -9 was <br />undermined by Panel C during 1993 but has showed no apparent impacts in the data collected since that time. <br />No anomalous water quality observations were apparent during 2015 at the Stevens Gulch shallow <br />groundwater monitoring wells. The monitoring technician only monitored these wells one time during the year. <br />Surface Water Monitoring Stations - SPRINGS <br />East Roatcap Creek - Two springs were monitored in the East Roatcap Creek drainage (refer to Table 1 and <br />Map No. 4-1) during the year. Spring 30 had flow during March and June and was dry the remainder of the <br />year. Spring 30 was first undermined in April 1983. Spring 10-10 was dry during the reporting period. Spring <br />10-10 was encompassed by the angle -of -draw of Panel Y during October 1993. Subsidence impacts were not <br />apparent at either of these locations during 2015. <br />West Roatcap Creek- Two springs were monitored in the West Roatcap Creek drainage (refer to Table 1 and <br />Map No. 4-1) during the year. Spring 32 was monitored monthly during the year. Spring 32 exhibited flows <br />that were near average. Water quality parameters were consistent with prior years sampling. Spring 14-4 <br />was monitored quarterly and it was dry all year. No mining occurred during the year in the Spring14-4 <br />watershed. <br />Stevens Gulch - One spring was monitored within the Stevens Gulch drainage (refer to Table 1 and Map No. <br />4-1) during the year. Spring 25 lies below an area of the East mine inactive since 1982. This site had no <br />measurable flows during the year. Spring 25 has been identified as an adjudicated water right within the <br />permit area. <br />Two springs with ponds in the Stevens Gulch drainage, Spring and Pond 13-5, Spring and Pond 13-6 were <br />monitored quarterly during the year. Spring and Pond 13-5 was undermined during the last half of 1992. <br />Spring and Pond 13-6 was undermined during the end of 1988. Spring 13-5 was reported to have a seep in <br />March and dry the remainder of the year. Spring 13-6 no measurable flows during the year. <br />Surface Water Monitoring Stations: STREAMS AND DITCHES <br />Overall, adverse impacts attributable to mining were not evident at any of the monitored surface water stations <br />(refer to Table 1 and Map No. 4-1). Stations SW -5 (Stevens Gulch) had below normal flows and was dry <br />during the October and November monitoring events. SW -6 (East Roatcap Creek) also had below normal <br />flows and was dry beginning with the September monitoring event. No evidence of subsidence impacts in <br />these drainages was apparent. Mining occurred in the Stevens Gulch drainage upstream of site SW -5 during <br />1993 in Panel C. Panel C mining was designed and conducted to prevent the development of subsidence to <br />protect the waterway and certain structures in the vicinity. Data collected during the year shows these <br />protective measures were successful. <br />Surface Water Monitoring Stations: SMALL AREA EXEMPTIONS <br />The west side of the east mine fan level is defined as a small area exemption since drainage from this area is <br />not conveyed to a sediment pond. One sample point is defined at this location and sampled for conformance <br />with the NPDES discharge alternative limitations requirements associated with discharges occurring because <br />of precipitation events of less than the 10 -year and 24-hour magnitude. In these instances, settable solids and <br />pH limitation must be met. No samples were collected during 2015 from this SAE point. <br />Coal Member of Mesaverde: <br />All previously monitored drill holes have now collapsed and are no longer monitored. The removal of these <br />monitoring points is explained in TR -34. <br />3 <br />