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The natural topography surrounding the pit and overburden stockpiles <br /> ranges in elevation from approximately 6250 to 6380 feet (U.S.G.S. Data) . <br /> The mine pit is located at the confluence of several intermittent drainage <br /> ' channels. The surface hydrologic characteristics of the area are <br /> 1 discussed in a later section of this report. <br /> Much of the permitted area has been reclaimed and the Division State <br /> subsequently released Umetco's bond for these areas. Low earthf-ill dikes <br /> have been constructed to create small detention basins upgradient of the <br /> pit and within the pit along the northeast Swale. Bare ground surfaces <br /> along the pit slopes and the surfaces of the regraded overburden piles <br /> were planted with grass in 1979-1980. <br /> Gully erosion has occurred in the gentle northeast swale and in the <br /> center of the pit. This gully has incised to several feet below the <br /> surrounding ground surface. <br /> 3.2 Johnson Pit <br /> The disturbed area associated with the Johnson Pit and adjacent <br /> regraded mine overburden stockpiles is approximately 35 acres. The pit <br /> itself covers an area of approximately 18 acres. The north end of the <br /> area has been reclaimed and released. The maximum depth of the pit is <br /> approximately 40 to 50 feet. The north and west walls of the pit are very <br /> steep, on the order of 112:1 (horizontal to vertical) . These walls are <br /> cut into moderately cemented sandstone and have one intermediate bench. <br /> The southern end of the pit slopes at approximately 5 to 20 percent. The <br /> natural terrain in the vicinity of the disturbed area ranges in elevation i <br /> from approximately 6200 to 6350 feet (U.S.G.S. datum) . <br /> -4 <br />