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iii i~iiii~~iiii~ iii , <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department o(Nawral Recourses <br />131 S Sherman SI_ Roum 215 <br />Drnvet CO A0203 <br />Phone: 0031 A66-35L7 <br />FAx:I}031 A32-8106 <br />DATE: March 10, 1993 <br />T0: James Stevens <br />FROM: James Dillie <br />RE: Plume Analyses <br />I ran two plume analyses for point source leaks at BMG's tailings facility. <br />pF p0~ <br />~` qb <br />He ` <br />0 <br />o ~ <br />'~y? <br />w/e ]6 <br />Roy Romer <br />Gno-emor <br />Michael B Long <br />Div Kion Direc Wr <br />I assumed a point source leak at the extreme northeast side of the lower <br />disposal area to a possible future monitoring well at the toe of the tailings <br />embankment (see attached map). The measured distance from the possible point <br />source leak to the monitoring well is 1500 feet. It would take a contaminant <br />plume (detectable amount) about 7,900 days (21.64 years) to reach the well. <br />I also assumed a point source leak in the extreme northeast side of the upper <br />disposal area. The distance from the projected leak to the monitoring well is <br />about 2,800 feet. A contaminant plume would reach the monitoring well in <br />about 20,975 days (57.47 years). <br />The analyses assume a porosity of 25%, dispersivities of Dx=100 and Dy=30, 2.5 <br />Ib/day cyanide and a seepage velocity of .048 ft/day. <br />Attached is a copy of the tabulated results of each analysis. <br />Need anything else? <br />JD/amm <br />6634E <br />