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West Elk Mine 2015 Surface Water and Groundwater Quantity and Quality Data Summary 13 <br />2.4 Underdrain and Mine Water Monitoring <br />Two underdrains were monitored in WY 2015. The underdrains are located at the lower <br />refuse pile (LRP) and at the refuse pile expansion (RPE) area. The LRP underdrain is <br />located above the sediment ditch at the base of the pile, east of former sediment pond <br />MB -2R. The RPE underdrain is located just above the RPE sediment pond. <br />A discussion of the underdrain monitoring sites, and a map showing the location of the <br />sites can be found in the 2014 Annual Hydrology Report (HydroGeo, 2015). The <br />underdrain monitoring program details are summarized in Table 8. <br />Table 8. Summary of the Underdrain and Mine Inflow Monitoring Program <br />Monitoring Site <br />Flow <br />Measurement <br />Field WQ <br />H, EC, tem <br />Annual Lab Water <br />Quality <br />Underdrains <br />LRP <br />3 x Year <br />3 x Year <br />Low Flow Period <br />RPE <br />3 x Year <br />3 x Year <br />Low Flow Period <br />Mine Inflows (if sampling criteria are met) <br />No mine inflows met sampling criteria in WY 2014 (MCC, 2015) <br />(1) Lab parameters include TDS, EC, pH, Ca, Mg, Na, K, SAF, hardness, bicarbonate, Cl, <br />Nitrite/Nitrate, PO4, SO4, Fe (tot & dissolved), Mn (tot & dissolved), Al, As (tot), Cd, Cu, Pb, Hg <br />(tot), Mb, Se (tot), Bo, Zn. <br />June 2016 HydroGeo, Ina <br />