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POWDERHORN COAL COMPANY <br />• .TABLE 7-2 <br />GROUND WATER REMOVED DURING UNDERGROUND MINING OPERATIONS <br /> Roadside South Portal Roadside North Portal <br />Source of Removal (gmp)* (Ac-ft/yr) (gpm)' (Ac-fUyr) <br />Ventilation Air 5.6 9.0 1.6 2.6 <br />Coal Leaving Mine 6.3 10.2 0.0 0.0 <br />Coal Processing 6.4 10.3 <br />Roads 1.3 2.1 <br />Mine Dewatering 295.7 477.0 111.9 180.5 <br />Total Quantity 315.3 508.6 113.5 283.1 <br />• Sources: <br />• Ventilation air volume estimated during typical relative humidity changes and <br />average air volumes in 1994. <br />• Coal leaving mine volume estimated using change in moisture and tons of coal <br />mined during the 1994 water year. <br />• Roads -estimated amount used on underground roads for dust control during <br />1994 water year. <br />• Coal processing volume -measured mine water usage during 1994 water year. <br />• Mine dewatering -mined discharges during 1994 water year. <br />` Daiiy average based on 365 days per year. <br />• <br />