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-~ <br />XXI. Bonding - Rule 2.05.4(2)(b) and Rule 3.0 <br />Regarding Overburden replacement and Topsoil Replacement at Pit 4 (the only <br />pit remaining to be backfilled), the following assumptions and cost estimates <br />were used to estimate backfillin9 and topsoiling cost at $162,470: <br />Amounts Stockpiled: 250;000 cubic yards overburden <br />~k 45,100 cubic yards of topsoil A <br />These amounts will be used to backfill and topsoil Pit 4,~a,n•I <br />~'~''itr` ar`ea~respectively. <br />~ _ <br />Maximum Hual Distance X2000°~inear feet (most likely haul under 1,000 feet). <br />Average Elevation: 7500 <br />Average Grade: 8% °<< <br />Equipment Spread: Cat 631D scrappers, Cat D9L's, Cat D8K tractor dozers, <br />Cat 14G motor graders. <br />A11 calculations based on information contained in Caterpillar Performance <br />Handbook, Edition 12. ~" e~ <br />Rolling resistance estimated from Table on p. 501 = 5%. <br />Altitude berating from Table on p. 504 = 100%. <br />Total effective grade loaded = 8% grade assistance minus 5% rolling resistance <br />= 3% favorable. <br />Total effective grade empty = 8% + 5% = 13% unfavorable. <br />Travel Time Calculations: <br />Loaded (haul) Time: From Retarder Curve on p. 186, with 3 % effective <br />0k <br />grade and 75,000 pound loaded scraper, speed = 31 mph. Then haul time <br />o! <br />= 2,Ob0'/31 mph = 0.73 minutes. p(t <br />Empty (return) Travel Time: From travel time curve on p. 188, with 13% <br />total resistance and 2,000' haul, return time = 2.3 minutes. ~L <br />