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• Table 5 Quality of Mine Water at the West Elk Mine Dur[ng the 1991 Water Year <br /> <br />IAration <br />Date pH <br />(uniu) Conductivity <br />(µmhos/cm) TSS <br />(mg/L) TDS <br />(mg/L) <br />MB-1 Discharge 10 Oct 90 7.8.5 450 5.33 351 <br />MB-1 Discharge 24 Oa 90 8.3 600 13.6 446 <br />MB-1 Discharge 2 Dec 90 7.9 470 33.2 284 <br />MB-1 Discharge 23 Jan 91 7.6 380 4.6 297 <br />MB-1 Discharge S Feb 91 7.45 800 4.19 600 <br />MB-1 Discharge 4 Mar 91 7.8 ,720 30.7 550 <br />MB-1 Discharge 26 AuQ 91 8.5 _ `?5001 4.8 f 82q <br />-2 ischarge 24 Oa 90 8.4 7~ 15.8 548 <br />MB-2 Discharge 8 May 91 8.5 750 8.7 473 <br />MB-2 Discharge 20 Aug 91 8.4 900 6.2 569 <br />Total fie <br />(mgR-) <br />0.26 <br />0.12 <br />0.02 <br />0.22 <br />1.08 <br />0.41 <br />0.12 <br />0.00 <br />• <br />Table 6 Mine Water Balance for the West Elk Mine <br />Parameter <br />Volume (Acre-feet) <br />Water pumped to FW-1 from the North Fork >118.2 <br />Potable water processed 13.5' <br />Water pumped underground 75.9 + <br />Water discharged from underground c 39.Oa <br />Water leaving the mine on coal az added moisture 14.9 - <br />Water leaving the mine on gob az added moisture 2.0 - <br />Water transferred from MB-1 and MB-2 to FW-1 (estimate) 7.5 <br />-Water leaving the mine in ventilating air and seepage 20.2 - <br />Fstimated sustained flow 5.0 + <br />Total mine water inflow (estimate) 80.9 .t <br />Total mine water outflow (estimate) 76.1 - <br />7 <br />. ~~ <br />