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-15- Mann Draw is located approximately 4 miles northwest of the gaging station on Williams Draw. Mann Draw is an intermittent stream with a total drainage area of 3.39 square miles (2,170 acres). An estimate of the average annual runoff was made by Leonard Rice Consulting Water Engineers, Inc. The estimated flow was obtained by multiplying the adjusted unit runoff value for Williams Draw, 0.049 acre-feet per acre, by the total area of Mann Draw. The resulting estimate was 106 acre-feet/year. There is one stock pond located on Mann Draw, about 2,000 feet downstream of the Bourg Strip Mine, The Bourg Mine is located 1.85 miles upstream of the confluence of Mann Draw with the Canadian River. Sudduth Draw is an intermittent stream with a total drainage area of 3.6 square miles (2,304 acres). The Marr Strip is located 1.1 miles upstream of the confluence of Sudduth Draw with the Canadian River. There are 3 stock ponds located along this stream's course, 2 within the life-ofanine area and 1 above the life-of mine area of the Marr Strip. Bush Draw is an intermittent stream with a total drainage area of 4.8 square miles (3,072 acres). The Marr Strip is located 2.1 miles upstream of the confluence of Bush Draw with the Canadian River, There are no stock ponds located along this stream's course, Bolton Draw is an intermittent stream with a total drainage area of 6,8 square miles (4,352 acres). The Spear Ditch diverts water from the Michigan River into Bolton Draw from Mdy through July. Both the Marr Strip and Canadian Strip are located in the headwaters of this stream; the Marr Strip is located l.8 miles, and the Canadian Strip is located 2,1 miles upstream of the confluence of Bolton Draw with the Canadian River. Ground Water Five aquifer systems havs been identified in the general area; the Upper Sandstone member of the Pierre Shale, the Sudduth coal seam, the perched lenticular sandstones of the Coalmont Formation, the Upland Terrace deposits, and the alluvium of the Canadian River and its tributaries. The Upper Sandstone member of the Pierre Shale can be considered a regional aquifer, since it is continuous and can transmit limited quantities of water. Pump tests conducted by Kerr Coal on this unit yielded a permeability of 0.15 gpd/f t2, thus indicating that the Upper Sandstone member of the Pierre Shale is a poor aquifer. Low permeabilities were obtained by Wyoming Fuei in two slug tests run at sites 1C and 5A on the siltstone underburden separating the Sudduth coal seam from the Upper Sandstone member, Testing indicated permeabilities of 0.09 gpd/ftZ and 0.01 gpd/f t2, respectively. Kerr Coal Company, in their pumping test, obtained no drawdowns in the Sudduth coat seam while pumping the Upper Sandstone member well located 20 feet away. The results of the two separate sets of aquifer analyses indicate that the siltstone underburden acts as an aquiclude, preventing dewatering of the sandstone member into mine pits.