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-4- <br /> 2. Backfilling Storage Bench <br /> A dragline is required to pull the 73,000 cubic yards of fill back up to the <br /> bench. Only 63,-000 cubic yards of fill are required to backfill the bench the <br /> additional 10,000 cubic yards will be left on the slope. <br /> From Mean's Building Cost Construction Data (1984) a dragline with a 1 1/2 CY <br /> bucket can move 520 CY per day at 987.40 per day. To move 63,000 CY would <br /> require 121 days at a cost of $119.475.00.______-- <br /> 3. 'Backf i l l ng of Conveyor Corr-1 dor /asK CRAfl ABU WA L- <br /> P ere are 3,675 feet ,pf conveyor corridor. Of this total, 800 feet of <br /> corridor is constructed using a retaining wall ._ The top two feet of the u er <br /> 'retaining wall aid all of the lower retaining wall will be removed by <br /> explosive demo tion. <br /> Using Mean' Crew B-8, 15,300 cubic feet can be removed per day at a daily <br /> cost of $ 222.00. It is assumed that 20 feet. of headwall will be removed a d <br /> that the headwall extends 4 feet into ope. Therefore, 64,000 cubic fe t <br /> will have to be removed. The cost f this rtion of the operat_ion__woul_d b <br /> $�,4� 78.00. <br /> After, the headwall is removed, the corri or will have to be regraded. A to al <br /> of 4,450 cubic yards of material will h ve to be moved with an average pus <br /> distance of 50 feet. <br /> A D9L has an unadjusted production rate of 2,200 CY/hr. at 50 foot avg push <br /> distance. The adjustments are as follp <br /> \Average operator •7 15 <br /> 0 Mi n Hour 0.84 j <br /> 0% grade factor 0.40 <br /> Total Adjustment 0.25 l� ' <br /> The adjusted .suction is 550 CY/hr.�It--w-6uld take 8. 1 hours to complete at <br /> the following cos r <br /> 1 - D9L dozer @ $144.29 = $ 1 ,169.00 <br /> 1 - Operator @ $118.00 = $ 146.00 <br /> Total Cost $ 1 ,315.00 <br /> 4. Sediment Pond Removal <br /> A total of three ponds are to be removed as part of this TR. These ponds are <br /> the new bus garage pond, the expanded bus garage pond and the new portal pond. <br /> It is assumed that all material required to backfill the ponds is in the <br /> embankment. A D9L with an average push distance of 50 feet as previously <br /> Hetermined can move 550 CY/hour. A total of 2,050 CY would have to be moved, <br /> which would require 4 hours including moving time. The total cost is as <br /> follows: <br />