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ID: <br />III IIIIIIIIIIIIIIII <br />sss <br />~ ROCKY MOUNTAIN CONSULTANTS, INC. <br />JUN 19'98 10:40 No .008 P.O1 <br />Inc <br />Premiere Building <br />R26 l~eioware Ave.. Suite 500 <br />Longmont. CO BD501 <br />(303) 772.5797 <br />Metro (303) 665-6283 <br />FAX (303) 665-0959 <br />E-mail rmclongQnrmli.com <br />.lone 19, 1998 <br />Mr. Thomas A. Schrcincr <br />);nvironmental Protection Specialist <br />Division of Minerals and Geology <br />Dcpartmeltt of Natural Resources <br />1313 Sherman Strcct, Room 21 S <br />~ Denver, Colorado 80203 <br />RI?: 'I'hc Shores 112 1'crmit Applicntiun Adeywtey Review, Filc No. M-9R-013 <br />Dear Mr. Schrcincr: <br />liall-Irwin Itas estimated the cost of senling i'hnse One of the mining nrea with a slurry wall in lieu <br />of backfilling the area to x depth 2' above the ground wau;r surface. The attached recltunation cost <br />estimate reflects this cost. I tall-Irwin Etas agreed wilt[ DMG on a cost o1' $2.35 per square face foot <br />of slurry wall on tlx bond amount for their Brighton project. 1 tall-Irwin's design specifications f'or <br />the construction afthc slurry wall are confidential and proprietary information. The materials tlscd <br />in the canstructirnT of the sluny wall system include hentnnite, slurry and soil bentonite back1i11. <br />The wall is keyed into the bedrock and forms a seal around the mine, isolating the mint from the <br />groundwater. I have included a technical brief regarding slurry wall reservoir lining systems 1'or <br />your file. <br />Please call mu if you have any yucsliuns ur need addiliunal information to complete your review <br />Thank you for your assistance. / r <br />(Jd=f 1 ~~ t 3-G <br />Sincerely, S~ ''~ J^ ~, ~{ ~~ , T <br />ROCKY MOUNTAIN CONSULTANTS, INC. Gz, f '~^-`"'" <br />r ~ <br />Barbara Brunk ~ r ~ (o ~~ C <br />Landscape Architect ~ <br />11:\UG?G U26V.1Lltd\L1MCilib$I'?.WI'U <br />CIVIL. AND ENVIRONMENTAL ENGINEERING ~ PLANNING <br />