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• Bulldozing - Ripping <br />Seismic velocity of SPGM = 3,000 feet per second. From the Caterpillar <br />Performance Handbook, the D9H tractor can rip about 2,300 cubic yards per hour. At <br />.70 availability/efficiency that volume reduces to 1,610 cubic yards per hour. <br />Ripping will be 1 foot deep, therefore: <br />1 foot x 43,560 ft2 = 1,613 yd3 or 1 acre ripped per hour <br />acre acre <br />27 ft3 <br />d3 <br />Y <br />Due to the configuration of the reclaimed area with relatively <br />symmetrical areas connected by a narrow road, the charted schedule should be doubled. <br />Accordingly, the ripping rate should be adjusted to 0.5 acres per hour, even though <br />most of the material to be ripped has been previously disturbed. <br />• Area to be ripped = 20.5 acres x $99.63/hour = 4,084.83 <br />.5 acres/hour $4,085 <br />Scraper - Backfill <br />Scraper productivity from the Caterpillar Performance Handbook is <br />difficult [o apply to the conditions at the Blue Ribbon site due to retrieval and <br />rehandling of the SPGM material which is currently occupying berms and dams <br />associated with erosion control structures. Rolling resistance is extremely <br />variable in this material and average loads and cycle times will be highly effected <br />by the assistance required of a pusher tractor. <br />100 cubic yards per hour should be expected to be a realistic productivity <br />figure for [he life of the reclamation phase. <br />$117.05/hour = $1.17/yd3 <br />100 yd3/hour <br />• $1.17 + 20X contingency = $1.40/yd3 <br />114ii1 (Rev. 1-13-82) <br />