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DRMS RECLAMATION COST ESTIMATION <br />Olathe Pit, Permit Number M-1984-108 <br />TASK NUMBER: 008 <br />TASK DESCRIPTION: Deliver backfill material to South Pond <br />DATE: January 11, 2008 <br />FROM: Wally Erickson <br />MATERIAL UNIT COST: $15.67/cu.yd. delivered to the site. See work sheet for Task <br />002 of this reclamation cost estimation for details regarding how the Division determined <br />the unit cost. <br />MATERIAL QUANTITY: According to a map titled, "Western Gravel, Inc., Wetlands <br />Bank, Map 2: Current Conditions," dated March 23, 2005, the South Pond water surface <br />is 5353.4 feet elevation and covers 2.66 acres.. The lowest elevation of the pond floor is <br />5342 feet; making the pond approximately 11 feet deep. Measurements from the map <br />indicate pond slopes below the water surface approximating 1.5H:1V. <br />Material quantity to backfill 2.66 acres area at 11 feet depth = <br />(2.66 acres)(43560 sq.ft./acre)(11'D) / 27 = 47206 cu.yd. <br />However, as noted above, the pond slopes are 1.5H:1 V and not vertical. Therefore, the <br />right triangle of material formed by the 1.5H:1V slopes (11 feet high and 16.5 feet in <br />length) must be subtracted from the above total. <br />Area of triangle = (base xheight) / 2 = (16.5 feet x 11 feet) / 2 = 90.75 sq.ft. <br />Assume shoreline = 2(340 feet) + 2(370 feet) = 1420 feet <br />Material quantity to be subtracted = (1420 feet x 90.75 sq.ft.) / 27 =•4772.8 cu.yd. <br />Backfill to the water surface = 47206 cu.yd. - 4772.8 cu.yd. = 42,433.2 cu.yd. <br />Backfill to one foot above water surface = <br />(2.66 acres)(43560 sq.ft./acre)(1'D) / 27 = 4291.5 cu.yd. <br />42433.2 cu.yd. + 4291.5 cu.yd. = 46,724.7 cu.yd. <br />TOTAL COST FOR DELIVERY OF MATERIAL TO SITE: <br />46724.7 cu.yd. x $15.67/cu.yd. _ $732,176.05 <br />