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on this density for replacement purposes. FPC printouts in Attachment 13-6 list the • <br />production time associated with each topsoil stockpile. <br />The topsoil replacement cost estimate was completed with the aid of Caterpillar's Vehicle <br />Fleet Production and Cost Analysis Program (FPC). All FPC parameters are listed for each <br />project area, <br />Revegeta[ion <br />Topsoil will be replaced from stockpiles. It was assurtied that all areas where tillage <br />equipment could operate would be disced to prepare the ::e edbed. Seeding is principally <br />accomplished using a rangeland drill. Though cover cropping is the principal form of <br />surface stabilization, 50 acres of Straw mulching and 5 acres of hydro mulching were added <br />as a contingency for areas requiring more intensive and immediate stabilization. Hydro <br />mulching has been included for critical areas where strew mulching equipment could not <br />operate. Shrub and tree plantings were estimated for the reclamation area and are <br />reflected in the costs. All costs, including fencing, are shown on Table 13-5-1 of <br />Attachment 13-5. Acreages and revegetation operations are shown on this table. A <br />revegetation failure rate of 10 percent was included for drill and broadcast seeded areas <br />and a 50 percent failure rate for shrub seeding areas and shrub/tree planting areas. <br />It was assumed that all reclamation would be complete up to the fourth spoil pile. It was <br />also assumed that revegetation ac[ivi [i es would be conducted from disturbance border to <br />disturbance border. This would include areas that have only been brushed. <br />Facili[v Reclamation <br /> <br />The following facilities, buildings, structures, and miscellaneous support items would <br />have to be demolished, disposed, and the area reclaimed if mining operations were to cease <br />in the year 1994. The following discusses the reclanietion of these structures. the <br />attached worksheets and tables show the pertinent volume ar~d area calculations. <br />Structure Demolition. This estimate assumes that all s[ruc LUres within the Seneca I1 Mine <br />area would have to be demolished and materials disposed. It also assumes that no salvage <br />value be attached to any of the structures. Means Astro 11 Computer Program was used to <br />estimate these costs. Volume determinations were made from existing maps and/or field <br />measured. The cost per cubic foot includes disposal. klot:t costs, except where noted, <br />13-54 Revised 12/01/93 i <br />