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j ~ <br />~ .NOU-18-98 14:Sfi From:CCi4 GOLD AND c <br />1719fi8932.4 T-804 POI/OS Jah-1fi3 <br />~ <br />~ <br />~~ . <br />~'r <br /> Cripple Creek & Victor Gold Mining Company <br /> c ( A Jeigr Venue - Pikr Dedt !di"in. C"mpr,y,1.1...T. <br /> ~~, TJ oP~r.:;.a, om« s.el.,..od om~e <br /> ~ <br />v P.O Hwt 191, 100 N. Ord J231 DTC ParkwAy, Sui[e 700 <br /> V Teter, Colorado BO850 Englewood, Colorado 801 t I <br /> (719) 689-2977 -FAX (7I9) 689-)ZS4 (303) 889-0700 • FAX (303) 889-0707 <br />October 13, 1998 <br />SENT BY FACSIbfILE AND <br />CERTIFIED RETURN RECEIPT REQUESTED <br />Z 2I7 656 682 <br />Mr. Berhan Keffelew <br />Environmental Protection Specialist <br />Colorado Department of Natltral Resources <br />Division of Minerals and Geology <br />Office of Mined Land Reclamation <br />1313 Sherman Street, Room 215 <br />Deaver, Colorado 80203 <br />Reference: Cresson Proiec[~Permit M-80-244: Humidity Cell Data for Cresson Vallev <br />.each Facility. <br />Dear Mr. Keffelew: <br />As we discussed, the Cripple Creek & Victor Gold Mining Company ("CC&V"} has collected <br />two representative samples of ore placed on the Cresson Valley Leach Facility and has, through <br />McClelland Laboratories, conducted humidity cell tests on these samples. The water-quality darn <br />for These samples through week 68 are attached (Attachment 1). Oa a bimonthly frequency, <br />McClelland Laboratories sends a leachate sample to Acculab for analysis. These samples are <br />analyzed for a representative suite of elements which correspond to most regulated water quality <br />patatneters, but which are analyzed as "rota!" rather than "dissolved" or "total recoverable" in <br />order, at this stage, to avoid concerns. We are providing a summary of the humidity cell water <br />quality data consisting of the McClelland Lab ;lad the Acculab data (Attachmea[ 2). The <br />average and standard deviation of all measuremenu represents all data with less-than values <br />treated as the less than number. The "85th Percentile" data represent all data with less than <br />values set to zero, as is the practice when computing ambient concentrations. <br />The samples of the Cresson Ore were collected from roughly five to seven different locations <br />in Phase Z and five to seven different locations in Phase 2. They were copected in mid-1997. <br />They arc considered repiesenLldve of the ore because (1) the ore character hes not changed over <br />time. (2) the pH of the solution in the pad has not changed over time confirming that, given the <br />constant lime application, the ore has not changed in a manner that would change the humidity <br />cell results, and (3) as we have examined the pH of test solutions of other leach pad material <br />(thcse data have been provided to the OMLR when applications have been made to use Pad #1, <br />