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The borrow area contains 21,000 cubic yards of suitable plant growth media after topsoil salvage. Approximately 23,000 cubic yards of sot{ is required to provide a minimum of 18" of cover. It is estimated that 2,000 cubic yards of the existing cover material can be salvaged and re-used for cover. Therefore, adequate cover material exists in the designated borrow area. See Table 14-7 for borrow area quantity calculation. See Appendix 9-4 for the analysis of soil samples 1 through 4. The location of th soil samples is presented on Exhibit 6C, Volume 5, Tab Section 14. are must be taken to salvage only the suitable plant growth media from the RSRDA borrow area. Additional soil samples will be obtained and Q~_ ,h~ analyzed prior to borrow area use to better define the salvage limits. Soils U~ ~ will be analyzed for pH, salinity, texture and sodium adsorption ratio (SAR). Six inches of topsoil will be salvaged from undisturbed portions of the RSRDA borrow area. It is estimated about one-half of the borrow area has been previously disturbed by light use roads, the upper diversion ditch and a prior borrow project, therefore it will be assumed that an average of three inches of topsoil will be recovered from the entire area. The topsoil will be pushed up around the perimeter of the area. Reclamation of the borrow area will involve grading the borrow area to blend into the o • surroundin c nd redistribution of the topsoil. 'tonally, the pper diversion ditch will be re-established throng the borrow area. Grading of the portal bench after sealing the portals will begin with installation of the french drain shown on Exhibit 6C. The french drain system has three branches. Two of the branches will intercept seepage from the portal seals. The third branch is designed to intercept water from the hillside southwest of the conveyor entry. This third leg extends above the level of the portal entries to intercept seepage along the existing hillside. The next reclamation step involves grading concrete and cinderblock remaining from demolition of the shop-office complex into the portal highwall. Sufficient amounts of dirt will be mixed with this material to eliminate voids and promote stability of the fill. Material will be cut from the west end of the portal bench and dozed into the highwall. Topsoil was not salvaged for this area, therefore the best available material from the cut areas will be used for the final cover. An estimated 3 - 4 soil samples taken while moving dirt in this area should identify the best available material. /fir' • 14-7 (Rev. 1/01)