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D. P. ENGINEERING, INC. • III IIIIIIIIIIIII III • ~ s~"° <br />2 WEST DRY CREEK CIRCLE, SIJTIE 250 TEL: 303-798-1455 <br />LITTLETON, COLORAll080120 FAX: 303-798-1648 <br />May 16, 1994 <br />Job No. 3503 <br />RECEIVED <br />MAY 17 1994 <br />State of Colorado Dy><ien cf t~ittetz~s ~, (seoso <br />Division of Mines and Geology ~Y <br />Office of Mined Lands Reclamation <br />1300 Sherman Street <br />Denver, CC 80203 <br />Attention: Mr. Berhan Keffelew <br />RE: Cresson Project: Permit No. M-80.244, Low Normal Stress Geomembrane/Soil Direct <br />Shear Testing <br />Dear Berhan, <br />We have reviewed the low normal stress direct shear test data presented by Golder <br />Associates (Golder), dated April 13, 1994, which was transmitted to us yourself, and additional <br />data which was provided to us Golder. This testing was performed at normal stresses of 15 and <br />30 psi under saturated conditions. The additional test data included the rerun of the 15 psi <br />normal stress point. <br />Based upon this additional test data the interface between the ore/ geomembrane/ and soil <br />liner material shows an interface friction angle of approximately 28 degrees. This testing <br />confirms the resulting factors of safety for the heap stability analyses performed by Golder and <br />satisfies our concerns on these issues. <br />Please feel to call if any further questions or comments concerning our review of the <br />permit application. <br />Regards, <br />D.P. Engineering, Inc. <br />~~ <br />Don Pointer, P.E. <br />President <br />c: \data\document\reports\mi ni ng\ccvre v3.1 tr <br /> <br />