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Productivity: <br />• Portal Bench <br />2 miles x 5,280 feet x 14 yd3 <br />hour mile pass = 246 yd3 <br />300 x 2 feet hour <br />pass <br />246 yd3 x .70 availability/efficiency 172.20 yd3 <br />hour hour <br />99.63 $/hour $0.58/yd3 <br />172.20 yd3/hour <br />$0.58 + 20% contingency = $0.70/yd3 <br />Volume required to backfill portal bench = 6,000 cubic yds. <br />6,000/172 yd3/hour = 34.88, say 35 hours <br />Cost: 6,000 x .7 $4,200 <br />Access Road <br />1 mile x 5,280 feet x 14 yd3 = 493 yd3 <br />hour mile pass hour <br />75x2 <br />• 493 yd3 x .70 availability/efficiency = 345 yd3 <br />hour hour <br />$99.63/hour = $.029 <br />345 yd3/hour <br />$0.29/yd3 + 20% contingency = $0.35/yd3 <br />Volume required to backfill access road = 4,500 cubic yards <br />4,500 yd3/345 yd3/hour = 13 hours <br />Cost: @ $0.35/yd3 = 4,500 x .35 $1,575 <br />Sediment Ponds <br />Assume tractor will be required to push the scraper and shape berme <br />for time equal to scraper time: <br />8,400 yd3 = 84 hours <br />100 yd/hr <br />Cost Rate from Access Road: $0.35/yd3 (add to SPGM salvage @ 0.35) <br />11411 <br />(Rev. 1-22-82) <br />