|
Draft West Elk Mine 2005 Annual Hydrology Report 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 imderdrain 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 2005 are
<br />shown on Map 1. A summary of the underdrain 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 />•
<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 (t)
<br />E 3 x Year 3 x Year Low Flow Period (0
<br />Mine Inflows
<br />1E-32XC-24HG-Roof n.m. n.m. Grab Sa le cz)
<br />ox Can on Main E2 XC 63 n.m. n.m. Grab Sam le al
<br />4 HG E3 XC 36 n.m. n.m. Grab Sa le (~>
<br />CM XC-66 E-7 Su n.m. n.m. Grab Sa le (2)
<br />19 HG E3 XC 14 Roof Water n.m. n.m. Grab Sam le ca)
<br />2 TG Su n.m. n.m. Grab Sa le cz)
<br />19 HG E3 XC 14 Roof Fault n.m. n.m Grab Sam le cz)
<br />19 HG E2 XC 34 n.m n.m. Grab Sam le <Z>
<br />19 HG E3 XC 40 Roof Water n.m. n.m. Grab Sa le cz)
<br />(1) lab parameters include TDS, Cond., pH, Ca, Mg, Na, K, SAR, hardness, bicarb., CI, Nitrite/NiMa[e, P04, 504, Fe (tot & diss), Mn
<br />(tot & diss), Al, As (to[), Cd, Cu, Pb, Hg (tot), Mb, Se (tot), Bq Zn
<br />(2) Lab parameters include TDS, TSS, Cond., pH, Ca, CI, Mg, Na, alkalinity, bicarb., carbonate, NittiteMihate, ammonia, Ortho
<br />phosphorus, 503, Fe (tot), Mn (tot), As (tot), Cr, Cd, Hg (tot), Se (tot), Zn (rot)
<br />• n.m.-no[measured
<br />September 2006 HydroGeo, Inc.
<br />
|