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Main Stockpile north of County Road: 7,182 cy. <br />. Stockpile neaz Water Treatment Area4,214 cy. <br />Stockpile at portal bench: 3,928 cy. <br />Total available: 15,324 cy <br />The topsoil from the Water Treatment area will be used to reclaim that azea. Similarly, the portal bench <br />stockpile will be used to reclaim the bench itself. These piles can be easily moved a short distance by a <br />D-7 dozer and spread over the desired area. The cost for this work is $0.75 per cubic yard x 8,142 cy = <br />$6,106. This cost includes final grading by the dozer. <br />The main stockpile of 7,182 cy will be moved by loader and truck and spread with a D-7 dozer. The <br />estimated unit cost is $1.SS per cy resulting in a total cost of $11,132. <br />Therefore, the total cost of topsoil replacement at the end of the mine life is estimated to be: $6,106 + <br />$11,132=$17,238. <br />17. Harrow Topsoil at the Whirlwind Portal Area <br />Harrowing topsoil at a grade of 3H:1 V requires a tractor and disc. The azea to be harrowed is 8.07 <br />acres of topsoil replacement azea + 1.82 acres of original stockpile azea = 9.89 acres. Assuming a unit <br />price of $220 per acre, results in a total estimated cost of $2,176. <br />18. Re-Seed, Mulch, and Block the Whirlwind Portal Area <br />The area of seeding and mulching is the same as that for harrowing topsoil: 9.89 acres. The seed mix is <br />the same as that for the Packrat Portal. Hydromulching and hydroseeding methods will be used at this <br />location since it has areas of 3H:1 V slopes and the azea is large enough to justify the mobilization of <br />• the hydroseeding truck. Wood fiber mulch will be included at the rate of 3,000 pounds (lbs) per acre. <br />Tackifiet will also be applied. The cost for this work, including mobilization is $1,200 per acre, for an <br />estimated cost of $11,868. <br />Whirlwind Mine June 07 E-17 <br />