2010-05-25_REVISION - C1981008 (8)

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8.2 Topsoil Salvage Depths -1988 Study Area This study addresses the approximate original permitted area of 274 acres or 235 disturbed acres, as shown on Map 2.04.9 -1. The suggested salvageable depths of topsoil material presented in this section are based on laboratory data and extensive field observations, and represent only the most suitable sources of topsoil material. No unsuitable sources of topsoil will be salvaged and used during reclamation activities. Table 2.05.4(2)(d) -3 summarizes topsoil salvage depths and characteristics by map unit for the New Horizon 2 Mine disturbance area. It should be noted that the topsoil depths and volumes listed in Table 2.05.4(2)(d) -3 are only estimates derived from field sample pits. Exact volumetrics for each topsoil horizon cannot be determined until actual topsoil removal is accomplished. WFC will live handle the majority of the topsoil with trucks and the mine shovel or large front end loaders in front of the active pit to the final graded backfill. WFC is committed to salvaging and redistributing all suitable topsoil. Map 2.05.4 -4 shows the actual replacement topsoil thickness for each vegetation category in the original permit area. As of February 2008, the only areas from the original permit that still requires topsoil replacement are the haul road, the overburden stockpile and some other minor areas. These areas cannot be re- topsoiled until the mine is in final reclamation. 8.3 Topsoil Salvage Depths -1995 Study Area This study addresses the additional permit area immediately east of 2700 Road and south of BB Road, which is an area of 105.8 acres. See Map 2.04.9 -1 for the boundary of this area. At the conclusion of Phase 6 topsoil removal campaign (12- 20 -95), WFC conducted a topsoil balance study for the approved permit boundary. The study included the entire New Horizon 2 mining area. The remaining undisturbed acreage that topsoil will be salvaged from plus the topsoil that was placed in topsoil stockpiles at the beginning of mining was taken into account. All disturbed acreages where taken into account. The conclusion of this study can be seen in Table 2.05.4(2)(d) -4. The study shows that New Horizon 2 will be topsoil deficient in Lift A of the two lift irrigated pasture reclamation portion. This Lift A has typically come from the first lift of the 30C soil group. To correct this shortage, WFC will substitute excess soil type 808 from the major (Revised October 2009) 2.05.4(2)(d) -25