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III IIIIIIIIIIIII III Lincoln DeVore,lnc Geotechnical Consultants - 1000 West Fillmore St. Colorado Springs, CO 80907 (7t9) 632-3593 April 10, 1990 Lawrence G. White, P.E. 1650 M Street Penrose, CO 81240 Re: Triaxial Testing and Slope Analysis, Spoils Pile, Twin Pines No. 2 Mine, Rockvale, Colorado Dear Mr. White: As requested, Lincoln DeVore personnel have visited the site of the proposed spoil pile. Site visits were conducted on March 1 and March 2G, 1990. Samples of the spoil material which had been placed on the site were taken on March 1 and transported to the laboratory for testing. Site measurements were taken March 26 for entry into a computer program for the geometry of the site. Scope of Work The purpose of our exploration was to measure the area of the proposed additional spoil, sample the typical spoil material and perform tests to determine the drained strength and in-place den- sity of this material. These data were to be analyzed and the stability of the spoils pile slope computed. We were informed that this spoils slope was to be 2:1 (horizontal to vertical). A slope of approximately 1~:1 (horizontal to vertical) was also analyzed to determine if slopes steeper than 2:1 could be utilized. Slope Measurements The slope measured was located at the top of what appeared to be an existing spoils slope. This existing slope is shown on the attached cross-section. The spoils portion of this slope cannot ' be much deeper than shown on the attached cross-section, since bedrock was located at both the top and bottom of this slope. Measurements were taken starting at a point on the edge of the road at the bottom of the existing and the proposed slopes. Insofar as we could determine, the maximum proposed section was measured. The measurements are not given in this report, but are reflected in the section attached.