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Curve Number DeterminaCion <br />• <br />SOIL TYPE <br />Undisturbed Area: <br />PredominanC soil groups in undisturbed mining areas: <br />Map Unit Svmbol Soil Series Soil Group <br />7a Savage silty B <br />clay Loam (80Y,) <br />7b Savage silty B to C <br /> clay loam (SOY) <br />11a Evans [on shallow B <br /> Variant sandy clay loam (80%) <br />llb Evanston shallow B to C <br /> Variant sandy clay Loam (80X) <br />18a Cochetopa loam (80Y,) B <br />18b Cochetopa loam (80%) B to C <br /> <br />19b <br />• <br />Rhone sandy <br />B <br /> clay loam (85%) <br />24a Coberly Variant B <br /> sandy clay loam (80X) <br /> <br />24b Coberly Variant B <br />sandy clay loam (80%) <br />Overall average soil group for mine area: B <br />Reference: WESCO, 1975. pp. 121-124. <br />Areal extent of soil units are shown on map M29 of the Trapper Mine permit <br />application. <br />Active Mining Area <br />Average infiltration race for pit bottom and spoils for the A Pit area is <br />0.97 in/hr (Radian, 1981, p. B-14). This is a generally slow infiltration <br />rate corresponding to a moderately high runoff potential. The infiltration <br />rate corresponds to Chat of hydrologic soil Group C. (Wesco, 1975, p. <br />129). <br />R~111SED FEB 1 `i '8~ <br />