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iii ii iii ii iiiiii ii i • <br /> <br /> STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Deparimenl o(Natural Resources <br />1373 Sherman SL, Room 215 <br />Denver, Colorado 80203 <br />DIVISION OF <br />Phone: (3031 866-3 5 6 7 MINERAL S <br />FAX: (303) 832-ri106 & <br /> GEOLOGY <br /> RECLAMATION <br /> MINING•SAFETY <br />DATE: Monday, July 02, 2001 Bill Owens <br /> Governor <br />TO: Gregg Squire Greg E. Watcher <br /> EAecuUve Director <br />Michael R Long <br />FROM: Allen Sorenson Division D~reaor <br />RE: Slurry Wall and Clay Liner, L.G. Everist, Inc., <br />Lohmann Pit, File No. M-2001-017 <br />The Applicant has provided designs, specifications, and quality assurance plans for [he clay liner and slurry <br />wall proposed for installation a[ the Lohmann Pit. The materials submitted have been reviewed under the <br />criteria in the Division's "Guide to Specification Preparation for Slurry Walls and Clay Liners" and i[ has <br />been determined that the Lohmann Pi[ proposal is eligible for the 20 percent bonding option described in the <br />Guide. The direct costs for the clay liner and slurry wall that should be incorporated into the amount of <br />required bond are calculated as follows. <br />Dewatering Cost: 1000 ac-ft to be dewatered (permit application exhibit L) = 325 million gallons. <br />325 m.g. x $201.50/m.g. (.CDOT cost data) _ $65,500.00 <br />Rip slra[e from Pil Floor to use as Liner Fill: The volume of fill required at the point of maximum liner cost <br />under the proposed mining and reclamation plan is 186,000 cubic yards. This quantity is based on the <br />assumption that Area B is mined out, with 3500 linear feet of liner installed under concurrent reclamation <br />and 2200 feet of liner to be installed at the north end. Given that the average pit depth is 34 feet, the volumes <br />are calculated as follows: <br />[(0.5 x 34 ft, x 102 ft. 3500 ft.) +27] x 20% =44,956 c.y. <br />(0.5 x 34 ft. x 102 ft. 2200 ft.) =27 = 141,289 c.y. <br />44,956 c.y. + 141,289 c.y. = 186,245 c.y. <br />The ripping cost is $30,458.00 as detailed in the attached estimating form for ripping work. <br />Load, Haul, Spread, Moisture Condition, and Compact Clay Liner Fill: <br />The combined cost for these tasks is $147,627.00 as detailed in the attached estimating fornt for scraper team <br />work. <br />