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• Topsoil Replacement. Topsoil replacement volumes were based on the volume of material in stockpiles <br />at the end of year 2004 The estimated volume in each stockpile was based on surveys and/or topsoil <br />salvage depth per soil type over a particular area lacresl. In an effort to arrive at realistic stockpile <br />volumes, topsoil densities were measured in the field. According to Caterpillar, the swell factor for <br />this type of topsoil would be around 35 percent from BCY to LCY. The material density, as measured <br />in the stockpile, was 2518 Ibs/cy. Assuming this material was compacted to 90 percent of its original <br />density, the original density would have been 2518 Ibs/cy divided by .90 = 2800 Ibs/BCY. To arrive <br />at the LCY density, take 2800 Ibs/BCY divided by 1.35 = 2075 Ibs/LCY. The Topsoil Balance <br />Summary Sheet is based on this density for replacement purposes. FPC printouts in Attachment 25-2 <br />list the production time and cost associated with each topsoil stockpile. <br />The topsoil replacement cost estimate was completed with the aid of Caterpillar's Vehicle Fleet <br />Production and Cost Analysis Program IFPCI. All FPC parameters are listed for each project area. <br />Revegetation <br />After the topsoil has been replaced, the seedbed must be prepared prior to seeding. This is <br />• accomplished by ripping and discing the seedbed. Seeding is principally accomplished using a <br />rangeland drill. It was assumed that 7.5 percent of the area would have to be mulched. Shrub and <br />trees are also planted in designated areas in the reclamation and reflected in the costs as shown here. <br />All costs, including fencing, are shown on the worksheet. Areas to be revegetated are shown on this <br />table. A revegetation maintenance fee of 10 to 50 percent was also included in case any of the <br />seeded areas failed and would have to be reseeded. <br />It was assumed that all reclamation would be complete up to the fourth spoil pile. It was also <br />assumed that revegetation activities would be conducted from disturbance border to disturbance <br />border. This would include areas that have only been brushed. <br />Facility Reclamation <br />The following facilities, buildings, structures, and miscellaneous support items would have to be <br />demolished, disposed, and the area reclaimed if mining operations were to cease in the year 2004. <br />The following discusses the reclamation of these structures. The attached worksheets and tables <br />show the pertinent volume and area calculations. <br />r~ <br />L.J <br />4 Revised 11/00 <br />