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90 = 2800 LBS/BCY. To arrive at the LCY density, take 2800 LBS/BCY divided by 1.35 = 2075 <br />LBS/LCY. All tables and calculations are based on these densities. • <br />Revepetation <br />After the topsoil has been replaced from stockpiles, the seedbed must be prepared prior to seeding. <br />This is accomplished by ripping and disking the seedbed. Seeding is principally accomplished using a <br />Rangeland <br />drill. It was assumed that 10 percent of the area would have to be mulched. Shrub and trees are also <br />planted in designated areas in the reclamation and reflected in the costs as shown here. All costs, <br />including fencing, are shown on appropriate worksheets. Areas to be revegetated are shown on the <br />worksheets. A revegetation failure rate of 10 percent was included for drill and broadcast seeded areas, <br />a 50 percent failure rate for shrub seeding areas, and an 85 percent failure rate for shrub/tree planting <br />areas. <br />It was assumed that all reclamation would be complete up to the fourth spoil pile. It was also assumed <br />that revegetation activities would be conducted from disturbance border to disturbance border. This <br />would include areas that have only been brushed. <br />Facilitv 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 2005. The <br />following discusses the reclamation of these structures. The attached worksheets and tables show the <br />pertinent volume and area calculations. <br />Structure Demolition. This estimate assumes that all structures within the Seneca II-W Mine area would <br />have to be demolished and materials disposed. It also assumes that no salvage value be attached to <br />any of the structures. Volume determinations were made from existing maps and/or field measured. <br />The cost per cubic foot includes disposal. Most costs, except where noted, were based on a mixture of <br />construction materials. All material is hauled to an open pit. All information regarding structure <br />volumes and costs can be found on appropriate worksheets. <br />Powerlines. Powerline demolition was based on information published in Means. Powerline lengths <br />were taken from Exhibits 12-2 and 12-3 and field surveys where needed. Total length of line that <br />traverses the permit area is 18,200 feet. An additional 5200 feet of line from the edge of the permit <br />area to the main Powerline will also be removed. <br />• <br />Facilitv Areas. After the buildings are demolished and disposed, the site is reclaimed.-The top one foot • <br />of gravel/scoria surfacing on the parking/storage areas will be ripped with a dozer and then picked up <br />and hauled to the pit area where it will be topsoiled and seeded. Concrete foundation areas will be <br />PR-05 4 Revised 05/05 <br />