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• Table 5 Quellty o[ Mlne Water at the West Elk Mine Durhig the 1991 Water Year <br /> pH Conductivity 1SS TDS Total Fe <br />Location Date (units) (µmhos/cm) (mg/L) (mg/L) (mg/L) <br />MS-1 Discharge 10 Oct 90 7.8.5 450 5.33 351 0.00 <br />MB-1 Discharge 24 Oct 90 8.3 600 13.6 446 0.26 <br />MB-1 Discharge 2 Dec 90 7.9 470 33.2 284 0.12 <br />MB-1 Discharge 23 Jan 91 7.6 380 4.6 297 0.02 <br />MB-1 Discharge 5 Feb 91 7.45 800 4.19 600 0.22 <br />MB-1 Discharge 4 Mar 91 7.8 _ 7~-0 30.7 _ 550 1.08 <br /> ~I)ischarge 24 Oct 90 8.4 750 15.8 ~Sd8 0.41 <br /> MB-2 Discharge 8 May 91 8.5 750 8.7 473 0.12 <br /> MB-2 Discharge 20 Aug 91 8.4 900 6.2 569 0.00 <br />• <br /> Table 6 Mine Water Balance for the West Elk Mine <br /> Parameter Volume (Acre-feet) <br /> Water pumped to FW-1 from the North Fork X118.2 <br /> Potable water processed 13.5 - <br /> Water pumped underground 75.9 + <br /> Water discharged from underground ~ 39.0 <br /> Water leaving the mine on coal as added moisture 14.9 - <br /> Water leaving the mine on gob as added moisture 2.0 - <br /> Water transferred from MB-1 and MB-2 to FW-1 (estimate) X7.5 <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 _~- <br /> Total mine water outflow (estimate) 76.1 <br />• <br /> 7 <br /> ~2'~ <br /> :~ <br /> . ~~ <br />