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• The method of topsoil replacement most often used at Colowyo, which makes use of dozers, <br />leaves the surface in a rough condition which minimizes wind and water erosion. The use of <br />a chisel plow following topsoil replacement and the construction of contour furrows at the <br />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 medium <br />capable of supporting the approved post-mining land use and the revegetation requirements <br />of Section 4.U. Soil testing has not indicated any deficiencies. Refer to Volume 3, Exhibit <br />]0, Establishment of Native Shrubs on Disturbed Lands in the Mountain Shrub Vegetation <br />Type. This study was conducted on the Colowyo Mine July 1975 through December 1979. <br />Colowyo has the option to apply 50-70 pounds of phosphorus per acre to all safely accessible <br />reclaimed mine areas prior to chiseling and seeding. <br />CJ <br />• <br />4.06-4 Revision Dale: 4/23/02 <br />Revision No.: TR-52 <br />