Laserfiche WebLink
West Elk Mine 2007 Annual Hydrology Report 40 <br />• 4.5 Mine Water Inflows <br />In WY 2007 there were no significant ground water inflows. Minor inflows totaling 106.78 ac-ft <br />occurred in the F Seam (10 ac-ft), faults (32.26 ac-ft), and other miscellaneous ground water <br />inflows (64.52 ac-ft) (Map 1, Figure 8) (MCC, 2008). Section 3.4 summarizes the mine sampling <br />protocols. <br />4.5.1 NW Panels Sealed Sump <br />During WY 2007, MCC water from the NW Panels Sealed Sump was drained through a borehole <br />to the NE Panels Sealed Sump. There was no discharge from the NW Panels Sealed Sump to the <br />Lone Pine Pipeline (MCC, 2008). <br />4.5.2 NE Panels Sealed Sump <br />During WY 2007, water collected in the NE Panels Sealed Sump was pumped out of the sump <br />using the mine water pumping facility (MWPF) up the vertical well and discharged to Sylvester <br />Gulch (MCC, 2008). A clarifying pond and energy dissipater system is located at this discharge <br />point. <br />is 4.6 Mine Water Sampling <br />During WY 2007 no mine water samples were collected; with the exception of mine discharge <br />water at 017 as part of the mine discharge permit requirements. <br />4.7 Biomonitoring Testing for Toxicity <br />During WY 2007, MCC conducted biomonitoring tests as required by the CPDS permit (MCC, <br />2008). Biomonitoring samples were collected quarterly from the West Fork of the Sylvester Gulch <br />effluent discharge (outfall 017). Testing included whole effluent toxicity or "WET" tests. Static <br />toxicity tests for acute (48-hour) and chronic (96 hour) were completed in WY 2007. The test <br />organisms included the daphnid (Daphnia magna) and the fathead minnow (Pimephales promelas). <br />The test results indicated that neither population was adversely affected in WY 2007. <br /> <br />June 2008 HydroGeo, Inc.