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• The extent of alluvial deposits in the Scullion Gulch drainage <br /> are shown on Map 102. Width of unconsolidated alluvial fill in <br />the drainage bottom normally ranges from 50 to 200 feet with a depth <br />of about 15 feet (see Illustration 18). Alluvial deposits in the <br />active channel range from about 5 to 20 feet in width. <br />Stratigraphy of exposed strata was described in Figure II.D-1. <br />Scullion Gulch is incised to a greater extend than Red Wash, as <br />described in section II.C-Geology of this permit application. <br />b. Hydrology <br />Drainage Basin Characteristics <br />Scullion Gulch drainage basin, an ephemeral watershed lying in <br />• the west portion of the mine permit area, covers 7,500 acres. <br />Scullion Gulch flows generally southeast, forming a dendritic <br />pattern. The terrain is covered with sagebrush, grasses, and <br />pinyon-juniper stands. Slopes average 15 percent in Scullion <br />Gulch, with sideslopes approaching 50 percent. Elevations range <br />from 5320 to 6420 feet above mean sea level. <br />The evapotranspiration-precipitation relationship for Scullion <br />Gulch, the same as in Red Wash, yields few springs. Several stock <br />ponds have been constructed in the upper portions of the basin for <br />the purpose of catching storm runoff for animal use until it is <br />lost to seepage or evapotranspiration. Little snowmelt contribution <br />to pond storage occurs on Scullion Gulch. <br />• <br />4/81 II.D-15 <br />