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<br />Final West Elk Mine 2005 Annual Hydrology Report
<br />23
<br />3.4 Underdrain and Mine Water Monitoring
<br />Two underdrains and nine mine water inflow sites were monitored in WY 2005. 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 aze 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 2005 are
<br />shown on Map 1. A summary of the underdtain and mine water inflow monitoring program is
<br />presented in Table 6.
<br />Table 6
<br />Summary of the Underdrain and Mine Inflow Monitoring Program
<br />r 1
<br />L J
<br />I •
<br />Monitoring Sit¢ 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 cn
<br />E 3 x Year 3 x Year Low Flow Period (0
<br />Mine In flows
<br />IE-32XC-24HG-Roof n.m. n.m. Grab Sam le rzl
<br />ox Can on Main E2 XC 63 n.m. ^.m. Grab Sam le tz>
<br />4 HG E3 XC 36 am. n.m. Gcab Sam le lzl
<br />CM XC-66 E-7 Sum am. n.m. Grab Sam le c2)
<br />19 HG E3 XC 14 Roof W afar n.m. n.m. Grab Sam ie a1
<br />2 TG Sum n.m. n.m. Grab Sam le w
<br />19 HG E3 XC 14 Roof Fault n.m. n.m. Grab Sam le ts)
<br />19 HG E2 XC 34 ^.m. n.m. Grab Sam le ts>
<br />19 HG E3 XC 40 Roof Water n.m. n.m. Grab Sam le c2)
<br />(1) Lab parameters include TDS, Cond., pH, Ca, Mg, Na, K, SAR, hardness, bicarb., CI, NitriteMitrate, P04, 504, Fe (tot & diss), Ma
<br />(tot & diss), AI, As (rot), Cd, Cu, Pb, Hg (tot), Mb, Se (tot), Bo, Zn
<br />(2J Lab parameters iuclude TDS, TSS, Cond., pH, Ca, CI, Mg, Na, alkaliuiry, bicarb., carboaa[e, Nitriie/Nilrete, ammonia, Ortho
<br />phosphorus, 503, Fe (tot), Mn (tots As (rot), Cr, Cd, Hg Qot), Se (rot), Za (tot)
<br />n.m. -not measured
<br />September 2006
<br />AydroGeo, [nc.
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