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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 backfilT 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 llnq of Conveyor Corridor p,sK gRAZ� A ev WA <br /> LL- <br /> ,There are 3,675 feet ,gf 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 aX 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 41 22.00. It is assumed that 20 feet of headwall wi-11 be removed a d <br /> " that the•"headwall extends 4 feet into cpe. Therefore, 64,000 cubic fe t <br /> will have to be removed. The cost f this ortion of the operation__woul.d b <br /> 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 f ollpaC�`1 <br /> 1 <br /> `,Average operator •�5 l <br /> 0 Min Hour 0.84 <br /> Oq grade f actor 0.40 <br /> Total Adjustment 0.25 ' <br /> The adjusted ro`duction is 550 CY/hr. It--w'ould take 8. 1 hours to complete at <br /> the following cos <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 /> '-etermined can move 550 CY/nour. 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 />