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Evaporation From Ponds There are eia ponds at the Southfield Hine property as shown on Figures 8 and 10. Table 5 lists the surface areas of each pond and the estimates of annual evaporation. The water lost to evaporation is a consumptive use and ie equal to 8.2 acre-feet per year from the eia ponds. The rate of evaporation is higher during the summer months than during the winter months, with 70 percent of the lose occurring from May through October. Since the surface areas of the ponds will not increase in the future, consumptive use will not change. Evaporation losses from the Black Water Pond is associated with the coal preparation plant and is included in the consumptive use of that facility. total Conavaptive Dae Total monthly water requirements do not change greatly through the year but are slightly higher in the warmer months because of increased evaporation from ponds and the need for outside duet suppression. Monthly consumptive uses for present and future conditions are show in Table 6 and Table 7. The total annual consumptive use by the mine is presently 39.5 acre-feet. with 2.9 acre-feet per month in the winter and 3.8 acre-feet per month in the summer. At a peak production of 500.000 tone of clean coal. if achieved. the total annual consumptive use will be 58.8 acre-feet. ranging from 4.6 acre-feet per month in the winter to 5.5 acre-feet per month in the summer. OP BHI~iiOiSHIP OF MIHB fiA76E OSAGE WIiH SIIBPACE FLOWS The mine area is located almost entirely within the Newlin Creek drainage. As described previously, water levels in the observation wells represent a piezometric surface as represented in Pigure 5. Since ground water movement is in the direction of decreasing potentiometric levels, ground water movement in the mine site area is to the northeast. somewhat parallel to drainages in the Newlin Creek basin. - 23 -