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Geotechnical Engineering Report <br />Rollin Consulting <br />Terracon Project No. 21025057 <br />SITE EXPLORATION <br />Terracon <br />The scope of the services performed for this project included site reconnaissance by an <br />engineering geologist, a subsurface exploration program, laboratory testing and engineering <br />analysis. <br />Field Exploration: A total of 5 test borings were drilled on April 12, 2002 to depths of about <br />38 to 51 feet below existing site grade at the approximate locations shown on the Boring <br />Location Map, Figure 1. All borings were advanced with struck-mounted drilling rig, utilizing <br />6-inch diameter hollow stem auger. <br />The borings were located in the field by pacing from property lines and/or existing site <br />features. The accuracy of boring locations should only be assumed to the level implied by <br />the methods used. <br />Lithologic logs of each boring were recorded by the engineering geologist during the drilling <br />operations. The subsurface materials overlying the claystone bedrock were visually <br />classified. At selected intervals, samples of the bedrock materials were taken by driving ring <br />barrel samplers. Representative bulk samples of the claystone bedrock materials were also <br />obtained from the borings. <br />Penetration resistance measurements were obtained by driving the ring barrel into the <br />subsurface bedrock materials with a 140-pound hammer falling 30 inches. The penetration <br />resistance value is a useful index of hardness of the bedrock materials encountered. <br />Groundwater measurements were made in each boring at the time of site exploration. <br />Laboratory Testing: All samples retrieved during the field exploration were returned to the <br />laboratory for observation by the project geotechnical engineer, and were classified in <br />accordance with the Unified Soil Classification System described in Appendix C. Samples <br />of bedrock were classified in accordance with the general notes for Rock Classification. At <br />that time, an applicable laboratory testing program was formulated to determine engineering <br />properties of the subsurface bedrock materials. Following the completion of laboratory <br />testing, the field descriptions were confirmed or modified as necessary and Logs of Borings <br />were prepared and are presented in Appendix A. <br />Laboratory test results are presented in Appendix B, and were used for the geotechnical <br />engineering analyses, and the earthwork recommendations. All laboratory tests were <br />performed in general accordance with the applicable ASTM, local or other accepted <br />standards. <br />2 <br />