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<br />Fill volume <br />43,560 ftZ/acre (4 foot avg. depth) (23.1 acres)(1 yd3/27 ft3) = 149,072 yd3 <br />(site GPS survey 7/15/99 identified 23.1 acres remain for com~le[ion) <br />Total volume = 149,072 yd3 (1.1 bulking factor) = 163,979 yd <br />Fill to be placed using a Caterpillar 627 scraper at a cost of $140/hour <br />Average haul distances of 1,200 feet <br />Total resistance (grade and rolling) is 8% <br />Cycle time: Loaded 3.5 minutes Empty 2.25 minutes <br />Total cycle time = 5.75 minutes (grade adjusted) <br />Haulage volume 20 yd3/load <br />Unadjusted production rate <br />60 minutes hour / 5.75 minutes/load (20 yd3/load) = 209 yd3/load <br />Production rate adjustments for 0.83 job efficiency and 0.92 operating altitude <br />209 yd3/hour (0.83) (0.92) = 160 yd3/hour <br />Scraper time required = (163,979 yd3 / 160 yd3/hour) = 1,025 hours <br />Total estimated cost = 1,025 hours ($140/hour)=$143,500 <br />Fill grading: <br />Equipment: 1 - D-8N dozer <br />Production Rate Assumptions: <br />Grading costs assumes the same grading costs (A.3) associated with topsoil <br />grading. <br />Tailings area / <br />$257/acre (23.1 acres) _ $5,937 / <br />TOTAL TAILINGS SITE FILL PLACEMENT COSTS ` /~ <br />REMAINING RECLAMATION COST OBLIGATION `~ $149,4` <br />D.2 Topsoil Placement and Grading <br />~, ,. ~~. <br />Tailings area ~~ ~1 ~_ ~ D <br />Topsoil replacement costs (A.2) _ $2,310 C ~ ~,pli- ~` <br />Topsoil grading costs (A.3) _ $257 / <br />($2,310/acre + $257/acre) (59 acres) =$151,453 <br />TOTAL TAILINGS SITE TOPSOIL COSTS )/. <br />REMAINING RECLAMATION COST OBLIGATION $151,453 <br />D.3 Regrade Diversion Ditches <br />Equipment: 1 - D-8N dozer <br /> <br />PRELIMINARY DRAFT <br />FOR DISCUSSION PURPOSES ONLY <br />