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West Elk Mine 2013 Annual Hydrology Report 42 4.3.4 RPE Pond and NSSA Pond The RPE Pond collects stormwater runoff and underdrain flows from the RPE and RPEE refuse pile areas. The North Soil Storage Area (NSSA) pond collects stormwater from the NSSA. In WY 2013 there was no discharge from the RPE pond or NSSA pond (Figure 9) (MCC, 2014). 4.3.5 Pond SG -1 Pond SG -1 was built to collect stormwater runoff from the mine ventilation shaft bench areas. Discharge from pond SG -1 is routed to Sylvester Gulch. In WY 2013 the discharge from pond SG -1 was 3.2 ac -ft (Figure 9) (MCC, 2014). 4.3.6 Mine Water Treatment Ponds Underground fault water (MCC's non - tributary water right) is pumped from the B -seam sumps through the mine water pumping facility (MWPF) and is directed to the mine water treatment ponds for aeration (if needed) and settling prior to discharge. Once treated, the water is discharged to Sylvester Gulch through Outfall 017. No water was discharged from this outfall in WY 2013 (Figure 9) (MCC, 2014). 4.3.7 WWTP Polishing Effluent from MCC's wastewater treatment plant (WWTP) is further treated (polished) in a buried vault prior to discharge. After retention in the polishing vault, the water is discharged through Outfall 007 and flows to pond MB -5E. 4.4 Mine Water Inflows In WY 2013, there were no significant groundwater inflows. Minor inflows totaling 37 ac -ft occurred in the B, E, and F seams, including both faults and other miscellaneous inflows (Figure 9) (MCC, 2014). Section 3.4 summarizes the mine sampling protocols. 4.4.1 NW Panels Sealed Sump There will be no further discharge from the NW Panels sealed sump to the Lone Pine Pipeline, as the pipeline was removed when the Lone Pine Gulch facilities area was reclaimed in 2004. 4.4.2 NE Panels Sealed Sump There was no discharge from the MWPF to Sylvester Gulch in WY 2013 (Figure 9) (MCC, 2014). June 2014 HydroGeo, Inc.