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West Elk Mine 2006 Annual Hydrology Report 27
<br />3.4 Underdrain and Mine Water Monitoring
<br />Two underdrains and nine mine water inflow sites were monitored in WY 2006. The underdrains
<br />are located at the lower refuse pile (LRP) and refuse pile expansion (RPE). The LRP underdrain is
<br />located 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 are greater than 5 gallons per minute (gpm) and/or where flows are present
<br />for more than 7 consecutive days. If mine inflows are continuous, they are sampled for laboratory
<br />analysis at least annually. The locations of the mine inflow sampling stations for WY 2006 are
<br />shown on Map 1. A summary of the underdrain and mine water inflow monitoring program is
<br />presented in Table 7. The water quality data for the underdrains, 9 mine water inflows, mine water
<br />effluent 007, mine water discharge 004 and 017 and mine water influent 007 are presented in
<br />Appendix H.
<br />T.~hln 7 C,~mmarv of the 7nderdrain and Mine inflow Monitoring Program
<br />•
<br />Monitoring Site Flow Measurement Field WQ
<br />(pH, cond, temp) Annual Lab Water
<br />Quality
<br />Underdrains
<br />Rp 3 x Year 3 x Year Low Flow Period ~~~
<br />E 3 x Year 3 x Year Low Flow Period ~'~
<br />Mine In flows
<br />19 HG E3 XC 41 n.m. n.m. Grab Sample (Z)
<br />0 HG E2 XC 36 Roof n.m. n.m. Grab Sam le (z)
<br />20 HG E3 XC 36 Roof n.m. n.m. Grab Sam le (2)
<br />0 HG E3 XC 36 Floor S rin n.m. n.m. Grab Sam le (Z>
<br />20 HG XC 36 Roof n.m. n.m. Grab Sam le (2>
<br />0 Setu E1 XC1 n.m. n.m. Grab Sam le (Z)
<br />2 TG e3 XC 32 n.m. n.m. Grab Sam le cz>
<br />South Mains E3 XC 20 Roof n.m. n.m. Grab Sam le cz)
<br />0 HG BEM Fault n.m. n.m. Grab Sam le (2)
<br />~'~ Lab parameters include TDS, Cond., pH, Ca, Mg, Na, K, SAR, hardness, bicarb., Cl, Nitrite/Nitrate, PO4, SO4, Fe (tot & diss), Mn
<br />(tot & diss), Al, As (tot), Cd, Cu, Pb, Hg (tot), Mb, Se (tot), Bo, Zn
<br />_ c2) Lab parameters include TDS, TSS, Cond., pH, Ca, Cl, Mg, Na, alkalinity, bicarb., carbonate, Nitrite/Nitrate, ammonia, Ortho
<br />phosphorus, 503, Fe (tot), Mn (tot), As (tot), Cr, Cd, Hg (tot), Se (tot), Zn (tot)
<br />n.m. -not measured
<br />December 2007 HydrOGeo, Inc.
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