Laserfiche WebLink
West Elk Mine 2014 Annual Hydrology Report 39 <br />4.3.3 Ponds FW -1 and FW -2 <br />Freshwater ponds FW -1 and FW -2 store raw fresh water from the North Fork diversion <br />intake gallery. Water from these ponds is pumped to the mine water storage tank and the <br />water treatment plant and potable water storage system. If the ponds overfill, excess <br />water is discharged back to the North Fork. In WY 2014 there was no discharge from <br />ponds FW -1 or FW -2 (Figure 10) (MCC, 2015). <br />4.3.4 RPE Pond and NSSA Pond <br />The RPE Pond collects stormwater runoff and underdrain flows from the RPE and RPEE <br />refuse pile areas. The North Soil Storage Area (NSSA) pond collects stormwater from <br />the NSSA. In WY 2014 there was no discharge from the RPE or NSSA ponds (Figure <br />10) (MCC, 2015). <br />4.3.5 Pond SG -1 <br />Pond SG -1 was built to collect stormwater runoff from the mine ventilation shaft bench <br />areas. Discharge from pond SG -I is routed to Sylvester Gulch. In WY 2014 there was <br />no discharge from pond SG -1 to Sylvester Gulch (Figure 10) (MCC, 2015). <br />4.3.6 Mine Water Treatment Ponds <br />Underground fault water (MCC's non -tributary water right) is pumped from the B -seam <br />sumps through the mine water pumping facility (MWPF) and is directed to the mine <br />water treatment ponds for aeration (if needed) and settling prior to discharge. Once <br />treated, the water is discharged to Sylvester Gulch through Outfall 017A. No water was <br />discharged from this outfall in WY 2014 (Figure 10) (MCC, 2015). <br />4.3.7 WWTP Polishing <br />Effluent from MCC's WWTP is further treated (polished) in a buried vault prior to <br />discharge. After retention in the polishing vault, the water is discharged through Outfall <br />007A and flows to pond MB -5E. 8.8 ac -ft of water were discharged from the WWTP to <br />Pond MB -5E in WY 2014 (Figure 10) (MCC, 2015) <br />4.4 Mine Water Inflows <br />In WY 2014, there were no significant groundwater inflows. Minor inflows totaling 28 <br />ac -ft occurred in the B, E, and F seams, including both faults and other miscellaneous <br />inflows (Figure 10) (MCC, 2015). Section 3.4 summarizes the mine inflow water <br />sampling protocols. <br />4.4.1 NW Panels Sealed Sump <br />There will be no further discharge from the NW Panels sealed sump to the Lone Pine <br />Pipeline, as the pipeline was removed when the Lone Pine Gulch facilities area was <br />reclaimed in 2004. <br />June 2015 HydroGeo, Inc. <br />