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• <br />Mountain Coal Company <br />West Elk Mine <br />Exhibit 67 <br />Windy Gap Process <br />mine, treated. if necessary and discharged. <br />Contributions <br />As discussed in the 1994 Annual Hydrology Report. 8.7 acre-feet of water was measured <br />as mine water inflow. The natural mine water inflow is not proponional [o the <br />production rate, but is affected by the areal extent mined and the geologic conditions. <br />Therefore, the 1994 data will be used for the entire term of permit. WEM believes that <br />this water is a valid contribution to the upper Colorado River basin, because the water <br />would have remained isolated in perched, confined aquifers if mining had not occurred. <br />Net Depletion <br />Depletion for the Nonh Fork 170.2 acre-tee[/year <br />Return flow to the North Fork 77.3 acre feet/year <br />Contributions to the North Fork 8.7 acre feet/year <br />NET DEPLETION 84.2 acre feet/year <br />n <br />U <br /> <br />Exhibit 67-3 Revised Sept. 1995 7877: Revised Apr. 1997 7879 <br />