2012-02-28_REVISION - M1980244 (89)

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1. INTRODUCTION This report was prepared by Dr. Zehong Yuan, P.E., of GeoSyntec Consultants (GeoSyntec), Atlanta, Georgia. The report was reviewed by Mr. Robert H. Swan, Jr., also of GeoSyntec, in accordance with the internal peer review policy of the firm. The laboratory testing program described in this report was performed at the request and authorization of Mr. Terry Mandziak, P.E. of Cripple Creek & Victor Gold Mining Company (CC &V), Victor, Colorado. CC&V authorized GeoSyntec to undertake a laboratory testing program to evaluate the interface shearing resistance between three site soils and two types of geomembrane proposed for use in the lining system of Pad No. 1 of the Valley Leach Facility. GeoSyntec understands that the sample preparation procedures and testing conditions used in the testing program were selected by Mr. Mandziak of CC&V to model anticipated field conditions. The interface direct shear testing was conducted at GeoSyntec's Soil - Geosynthetic Interaction Testing Laboratory located in Atlanta, Georgia. 2. TESTING PROGRAM 2.1 Scope The testing program consisted of three interface direct shear test series. Each interface direct shear test series consisted of a single, individual direct shear test. 2.2 Testing Method GLI1126/SG100011.DOC 1 00.02.25 '2000 GeoSyntec Consultants The Interface direct shear tests were conducted in accordance with the American Society for Testing and Materials (ASTM) Standard Test Method D 5321, "Determining the Coefficient of Soil and Geosynthetic or Geosynthetic and Geosynthetic Friction by the Direct Shear Method ". The tests were conducted in a large direct shear device containing an upper and lower shear box. The upper shear box measured 6 in. by 6 in. (150 mm by 150 nun) in plan and 3 in. (75 mm) in depth. The lower shear box measured 12 in. by 14 in. (300 mm by 350 mm) in plan and 3 in. (75 mm) in depth.