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• TABLE 5 Quality of Mine Water at the Mt. Gunnison No. 1 Mine During the 1989 Water Year <br /> <br />Location <br />Date pH <br />(units) Conductivi- <br />ty <br />(µmhos/cm) TSS <br />(mg/L) TDS <br />(mg/L) Total Fe <br />(mg/L) <br />MB-1 Discharge 7 Mar 89 9.0 1550 7.7 1240 0.0 <br />MB-1 Discharge 15 Mar 89 8.2 645 20.0 449 0.66 <br />MB-1 Discharge 2 May 89 8.5 1300 1.7 724 0.04 <br />MB-2 Discharge 26 Jan 89 7.4 900 6.0 636 0.045 <br />MB-2 Discharge 24 Feb 89 7.4 1200 31.2 593 1.22 <br />MB-2 Discharge 1 Mar 89 7.4 695 29.6 515 0.350 <br />MB-2 Discharge 7 Mar 89 8.0 700 47.0 501 0.0 <br />MB-2 Discharge 15 Mar 89 7.7 500 2.98 349 0.0 <br />MB-2 Discharge 4 Apr 89 8.5 950 18.9 703 0.34 <br />MB-2 Discharge 2 May 89 8.2 900 4.2 435 0.0 <br />MB-2 Discharge 8 May 89 8.0 880 0.94 624 0.0 <br />• <br />C~ <br />TABLE 6 Mine Water Balance Gunnison No. 1 Mine <br />Parameter <br />Volume (Acre-feet) <br />Water pumped to FW - 1 from the North Fork 6.30 <br />Potable water processed 7.16 <br />Water pumped underground 6.5 <br />Water discharged from underground 2.74 <br />Water (caving the mine on coal as added moisture 9.27 <br />Water leaving the mine on gob as added moisture 0.77 <br />Water transferred from MB - I and MB - 2 to FW - 1 (estimate) 0 <br />Water leaving the mine in ventilating air and seepage 0.44 <br />Estimated total sustained flow 9.3 <br />Total mine water inflow 15.80 <br />Total mine water outflow 13.22 <br />7 <br />