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' The method of topsoil replacement most often used at Colowyo, which makes use of <br />dozers, leaves the surface in a rough condition, which minimizes wind and water <br />• erosion. The use of a chisel plow following topsoil replacement and the construction of <br />contour furrows at the time of seeding or before will also aid in erosion control. <br />4.06.5 Reconditioning <br />Topsoil quality at Colowyo is excellent in terms of providing a suitable plant growth <br />medium capable of supporting the approved post-mining land use and the revegetation <br />requirements of Section 4.15. Soil testing has indicated the lack of deficiencies. Refer <br />to Volume 3, Exhibit 10, Establishment of Native Shrubs on Disturbed Lands in the <br />Mountain Shrub Vegetation Type. This study was conducted on the Colowyo Mine July <br />1975 through December 1979. Colowyo has the option to apply 50-70 pounds of <br />phosphorus per acre to all safely accessible reclaimed mine areas prior to chiseling and <br />seeding. <br /> <br />4.06-4 <br />• <br />Revised 4/23/02 <br />TR-52 <br />