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approved postmine land use plan, Lhere will be approximately 28,800 feet of haul toad <br />whi:h wr11 be narrowed to 30 feet in width 119.8 acres) and act as a permanent access <br />road. This area is included in the shaded portion of exhibit 9-3a. Therefore, the total <br />area requiring topsoil is 607,4 acres. 74+o additional areas, sedimentation Ponds 004 and <br />006, were not included in the disturbance acres requiring tcpsoll. In a subsequent <br />revision, Seneca will request these two areas covering 9.5 acres also become a part of the <br />approved postmine land use plan. By dividing the number of acre-feet available soil <br />(375.7) by the number of acres of existing disturbance (607.41, it is estimated 0.6 feet <br />o; suitable soil is available to be replaced. The average thickness of replaced soil is <br />likely to exceed 0.5 fee[ as the stockpiled soil swells during redistribution. No figures <br />for sYielling o[ compaction of the topsoil replacement process were included in the <br />calculations above since no exact numbers exist or have been determined from field studies <br />a_ the Seneca II Mine. <br />cu-i.Tery. The soil replacement thickness fot the remaining permit terms is approved to be <br />1.0 feet (Permit C-60-005, Tab 9, Attachment 9-41. A detailed frnal topsoil replacement <br />plan will be submitted to the GS Vision during the Permit Renewal 03 for approval of the <br />existing conditions. As is stated in the permit on Pages 9-41 and 13-11, current <br />literature and on-site data show that 6 Lo 15 inches of topsoil, underlain wish chemically <br />and physically suitable spoil material will be sufficient [o: 1) establish a proper <br />' seedbed and rooting medium; and 21 achieve a compatible relationship between production, <br />divzrsity, and plant community composition. Seneca has also recently implemented a study <br />~o cetermine whether a reduction in topsoil depth application will temporarily inhibit <br />grass est a'olishment while favoring shrub establishment. Seneca will wntinue to salvage, <br />store, and replace soil as described ar~d approved in Permit C-20-005. <br />• <br />9-43c Revised 11/27/56 <br />