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CC6V Gold Mng. Co. ID•9-689-4040 JUN 1~5 20IIIIIIIIIIIIIIIIIII2 <br />999 <br /> <br /> <br /> 700, Englewood <br /> <br /> 889-0707 <br /> <br />~~ Cripple Creek & Victor Gold Mining Company <br />A Joint venwre -Plkee Peek MInIn4ComWnN, eAeneOer <br />~tt 7 opsratan• ottke En01o~~ OHIC~ <br />`f~ P.O. Boz 19t, 2755 State Highway 67 5251 OTC Perkwey. Suite <br />Victor, Coloredo 80860 Colorado 80111 <br />p19) 669.2977 • FAX (719) 6693254 (303) 699-0700 • FAX (303 <br />June 13, 1995 <br />SENT BY FACSIMILE AND EXPRESS MAIL <br />Mr. Berhan KeffeL:w <br />F~tvimnmental Protection Specialist <br />Colorado Department of Natutal Resources <br />Division of Minerals and Geology <br />Office of Mined Lend Reclamation <br />1313 Sherman Street, Room 215 <br />Deaver, Colorado 80203 <br />Reference: Provision of information Up~atine the EcLt'mation of Leakage Rates. <br />Dear Mr. Keffelew: <br />This letter provides the information that the Office of Mined Land Reclamation ("OMLR') has <br />requested on a number of oxasions and which the Cripple Creek & Victor Gold Mining <br />Company ("CC&V") agreed, in our meeting of May 28th, to provide by mid-June. This <br />information updates section 4.8 of that pottloa of the approved Mioing and Reclamation Plan <br />contained in Volume II of the Application (as 'Appendix 1 ") and titled 'Peantitting Level Design <br />Evaluation of the Expansion of the Mining and Ore Processing Facilities -Cresson Project.' <br />That section dews upon experience with solid waste land fills to project anticipated leakage rates <br />cad to identify actions. that an operator would undertake should leakage mat numeric levels. <br />This update has been developed by Golder Associates and is necessary to conform the <br />projections with the as-built conditions. The focus of the update is on the Pregnant Liner System <br />("PLS"): <br />The premise for modeling purposes remains the same for these calculations as in the past, that <br />is the presence of one hole, 2 mm in diameter, per acre. The input and the model are those <br />presented by the EPA for landfills (rather than mining operations), The input to the model was <br />updated for the Phase I PLS configuration. <br />Results of the projections for the SOth, 90th, and 98th percentiles of the probabilistic <br />computations aze provided as the Attachment to the Golder Associates letter of May 24, 1995 <br />which is included with this letter as Attachment 1. Linear extrapolation between points is <br />acceptable. <br />We need to sttrss that the EPA developed its guidance (referenced in the Golder Associates <br />Attachment) to mitigate the,R(+r~~ti?t for solution accumulative between the top and bottom liner <br />of a leak detection system. The EPA worked from cases in which the leak detection system was <br />