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l Holnam, Inc. 7erracon ELI Project No. 20945006 Field Exploration: Afield exploration was performed consisting of a visual observation of the site by a senior engineering geologist from Empire Laboratories, Inc. on January 13, 1 f~94. Samples were obtained from two stockpiles of mined overburden material located on the q~~arry face. A 7 third sample was obtained from fill that had been placed along the west edge of the mined surface J at the top of the dip slope. J The samples were positioned in the field by pacing from existing topographic features. The accuracy of sample locations should only be assumed to the level implied by the method used. Laboratory Testing: All samples retrieved during the field exploration were returned to the laboratory for evaluation by the project geotechnical engineer, and were classified in accordance with the Unified Soil Classification System described in Appendix C. Samples of bedrock were classified in accordance with the general notes for Bedrock Classification. At that time, the field descriptions were confirmed or modified as necessary, and an applicable laboratory testing J program was formulated to determine engineering properties of the subsurface materials. Selected bedrock samples were tested for the following engineering properties: • Shear strength • Moisture density relation • Grain size • Permeability • Plasticity J The significance and purpose of each laboratory test is described in Appendix C. L~jboratory test results are presented in Appendix B, and were used for the geotechnical engineering analyses, and J the development of earthwork recommendations. All laboratory tests were performed in general accordance with the applicable ASTM, local or other accepted standards. J J J J SITE CONDITIONS The site consists of an existing quarry face at Slab Canyon. The dip slope of the bedrock in this area is approximately 12 degrees to the east. The limestone tense, which is mined, is approximately 20 feet thick and is overlain by an approximately 20-foot thick sandstone tense. The sandstone is blasted and removed to expose the limestone which is also blasted and removed. The underlying bedrock consists of sandstone. The quarry consists of areas where the base sandstone is exposed as well as areas in which the limestone and upper sandstone leave not been removed. Several stockpiles of overburden sandstone material are located on the :slope face. A small amount of blasted overburden material has been placed at the top of the ridge on the west edge of the site. At the time of our site observation, limestone was being removed ~y a front end 2