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West Elk Mine 2001 Annual Hydrology Report 12 <br />I • 3.4 Underdrain and Mine Water Monitoring <br />Two underdrains and three mine inflow sites are currently monitored. The underdrains are located <br />at the lower refuse pile (L,RP) and refuse pile expansion (RPE). The LRP underdrain is located <br />above the sediment ditch at the base of the pile east of sediment pond MB-2R. The RPE <br />underdrain is located just above the RPE sediment pond. Mine inflows are monitored at sites <br />where discernable flows aze greater than 5 gpm and/or flows last longer than 7 days. If mine <br />inflows are continuous, they are sampled for laboratory analysis at least annually. Locations of the <br />mine inflow sampling sites for WY2001 are shown on Map 1. A summary of the underdrain and <br />mine inflow monitoring is presented in Table 6. <br />Table 6 <br />Summary of Underdrain and Mine Inflow Monitoring <br />n <br />L_J <br />Underdrain Flow Measurement Field WQ <br />(pH, cond, temp) Annual Lab Water <br />Quality <br />LRP 3 x Year 3 x Yeaz Low Flow Period (4) <br />RPE 3 x Yeaz 3 x Yeaz Low Flow Period (4) <br />Mine Inflows <br />14 E Bleeder 10/XC El 3 x Yeaz 3 x Yeaz Low Flow Period (4) <br />BCM 30/XC 3 x Yeaz 3 x Yeaz Low Flow Period (4) <br />13A 7-8/XC, 1 Enuy 3 x Yeaz 3 x Year Low Flow Period (4) <br />3 x year - 77aee times per yeaz <br />(4) Lab parameters include TDS, Cond., pH, Ca, Mg, Na, K, SAR, hazdness, <br />bicatb., CI, Nitrite/Nitrate, P04, 504, Pe (mt & diss), Mn (tot & diss), Al, As (tot), <br />Cal, (_L, Pb, Hg (tot), Mb, Se (tot), Bo, Zn <br />3.5 U.S. Forest Service Resources <br />• <br />MCC and the U.S. Forest Service District Office in Paonia, Colorado (Forest) have agreed to <br />informally monitor the Forest's appropriated water resources that are located over planned <br />longwall panels and within the angle-of-draw of potential surface impacts of the mining operations. <br />These resources aze listed in Table 7 and shown on Map 3. <br />Project # 00301 HydroGeo, Inc. <br />