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A digitizer was used to balance the cut and fill volumes of material needed to create the above- <br />. described topography. A swell factor of 15.3 percent was utilized based on studies discussed in <br />Chapter 20 for the bonding estimate. The two adjacent spoils would be dozed into the open pit and the <br />two back (furthest from the pit) spoils would be graded into the adjacent v's created by the spoil (see <br />appropriate worksheets in Attachment 25-11. <br />Highwalls will be reduced and sloped towards the open pit. This would be accomplished by drilling and <br />shooting the highwall (see worksheets) and then dozing/ripping the blasted material into the open pit. <br />See appropriate worksheets in Attachment 25-1 for a complete listing of volumes to be dozed into the <br />open pit. <br />A Caterpillar computer program called EMF was used to determine dozer production. This program <br />utilizes information given in the Caterpillar Handbook. All tables and charts have been computerized to <br />simulate production for track type equipment. See various worksheets for production and costs. <br />The premining and postmining topography maps were compared for material movement. Due to the <br />tact that the topographic highs and lows will generally be located in the same area after mining as they <br />were prior to mining, it is not anticipated that wheel type earthmovers will be needed to backfiil the <br />• final pit. <br />No box cut spoil gratling is included in this estimate. The timing and location of the box pit spoil is such <br />that all box pit spoil will be reclaimed by the end of 2005, and therefore, was not included as a liability <br />in the "worst case" year. <br />Ramp grading estimates are included with spoil grading. It was assumed that ramps would be graded at <br />the same time as two spoils are pushed into the pit and, therefore, additional cost is not estimated for <br />this project. <br />Currently, the Division determines the worst-case condition and uses the CIRCES Cost Estimating <br />Software to estimate liability costs. <br />Topsoil Replacement. Topsoil replacement volumes were based on the volume of material in stockpiles <br />at the end of~year 2004 (See Table 213, Topsoil Stockpile Inventory). The estimated volume in each <br />stockpile was based on topsoil salvage depth per soil type over a particular area (acres). In an effort to <br />arrive at realistic stockpile volumes, topsoil densities were measured in the field. The material density, <br />as measured in the stockpile, was 2518 LBS/CCY. According to Caterpillar, the swell factor for this <br />type of topsoil would be around 35 percent from BCY to LCY. Assuming this material was compacted <br />• to 90 percent of its original density, the original density would have been 2518 LBS/CCY divided by <br />PR-05 3 Revised 05/05 <br />