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• • iii iiiiiiiiiiiu iii <br />I/~' Cripple Creek & Victor Gold Mining Company 999 <br />P ~ A Jo~nl Venture -Pikes Peak Mining Com Deny, Manager <br />"`{~~~//~ ~ Operations Ofllce Englewood Oflice <br />l\;+,~ ~ P.O. Box 191, 2755 State Highway 67 5251 DTC Parkway. Suite 700. Englewood <br />Victor, Colorado 80860 Colorado 80111 <br />(719) 689-2977 • FAX (719) 689-3254 (303) 889-0700 • FAX (303) 889-0707 <br />September 2, 1994 <br />SENT BY FACSIMILE -HARD COPY FOLLOWS BY MAIL <br />Mr. Berhan Keffelew <br />Environmental Protection Specialist <br />Colorado Department of Natural Resources <br />Division of Mines and Geology <br />Office of Mined Land Reclamation <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Reference: Cresson Project: Permit Number M-80-244: Report of Puncture <br />Resistance Test Results For Geomembrane Tested With Specification Soil <br />Liner (2 inch minus). <br />Dear Mr. Keffelew: <br />We are enclosing the geomembrane puncture resistance test results for the liner test that was <br />agreed to be performed during the on-site meeting with Office of Mined Land Reclamation staff <br />on August 29, 1994 (reference our letter of August 30, 1994). More specifically, this test <br />measured synthetic geomembrane performance when the membrane was placed directly on <br />prepared soil liner fill containing soil materials between the 3/4-inch and 2-inch fraction at the <br />surface. <br />Test Procedure: <br />A static test of the Cresson valley leach loading of the geosynthetic Very Low Density <br />Polyethylene ("VLDPE") liner was performed. Liner cover fill (l inch minus material) was <br />placed directly onto a 80-mil VLDPE geomembrane and the liner was underlain by compacted <br />soil liner fill (treated Ironclad tailing materials) that contained two approximately 2-inch size <br />gravel pieces placed Flush with the interface (top) surface. The samples of liner cover fill, <br />geomembrane, soil liner fill and 2-inch size gravel pieces were obtained from project materials <br />that were either removed from the placed fill (Ironclad) or from stockpiles (liner cover). The <br />surface of the soil liner fill was sloped to simulate conditions that occur on the side slopes of the <br />pad during loading. <br />A ]0-inch diameter percolation cell was used to confine the layers of drain cover fill, VLDPE, <br />and soil liner fill. The composite of layers was subjected to a static load of 300 psi <br />(approximately 375 feet of equivalent ore) overnight. The cell was then dismantled and the <br />VLDPE was evaluated for deformation and damage. The purpose of this type of large scale <br />