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• Surface Water Wyoming Fuel Company's lease tract (C-30168) lies on the upper end of Bolton Draw, a tributary of the Canadian River, and ultimately of the North Platte River system. Most of the water in the Canadian River is developed from snowmelt in the higher mountains to the east; however, some contribution is made by Bolton Draw and similar drainages which collect snowmelt and water from precipitation events on the floor of~the park. Bolton Draw drains an As plotted on Plate 4 (see Appendix), the drainage is Canadian River, on the sou by Bush Draw. Flow in the cepting the Canadian River area of approximately 10.6 square miles. Willard Owens report at the end of this bounded on the north and east by the th by the Michigan River and on the west drainage is generally northward, inter- in Section 31, T95, R79W. i • The Pit 2 area drains into the North Fork of Bolton Draw which extends southwestward into the main channel of Bolton Draw, Approximately 1.8 sq.mi. (Zones III, IV and V on Plate 4} are drained by the North Fork of Bolton Draw. Zone III will not be affected by the mining operations. Sixty-eight acres of Zone IV ~ will be physically disturbed by overburden and coal removal. Surface water collecting in Pit 2 will be pumped into sediment Pond No. 4 (see Mine Plan Exhibit ). In addition to the sixty- . eight acres of actual disturbed land, water from thirty-four acres of adjacent undisturbed land will also be diverted into sediment Pond No. 4. Therefore, at the time of maximum disturbance in year 4, 21.5$ of any runoff that watershed IV received will be temporarily i stored before being released into the North Fork of Bolton Draw, The remainder of the area lying upstream of the disturbed area will be diverted around sediment Pond No. 4, while the rest of the water- shed lying downstream of the pit will flow as it presently does. u -69-