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Geotechnical Engineering Report <br />Eagleview Drainage Channel <br />Southwest of "F" Street and 35ei Avenue <br />Terracon Project No. 21035051 <br />SITE EXPLORATION <br />Terracon <br />The scope of the services pertormed for this project included a site reconnaissance by a geotechnical <br />engineer, a subsurface exploration program, laboratory testing and engineering analyses. <br />Field Exploration <br />Six test borings were drilled on May 28, 2003. The borings were drilled to approximate depths of 15 <br />feet at the locations shown on the Site Plan, Appendix A. The borings were drilled within the <br />anticipated alignment for the proposed channel. All borings were advanced with struck-mounted <br />drilling rig utilizing 4-inch diameter solid stem augers. <br />The borings were located in the field by the client. Ground surface elevations at each boring location <br />were obtained by the client. The accuracy of boring locations and elevations should only be assumed <br />to the level implied by the methods used to determine each. <br />Lithologic logs of each boring were recorded by the field engineer during the drilling operations. At <br />selected intervals, samples of the subsurface materials were taken by driving split-spoon and ring- <br />barrel samplers. <br />Penetration resistance measurements were obtained by driving the split-spoon and ring-barrel <br />samplers into the subsurface materials with a 140-pound hammer falling 30 inches. The penetration <br />resistance value is a useful index in estimating the consistency, relative density or hardness of the <br />materials encountered. <br />Groundwater conditions were evaluated in each boring at the time of site exploration, and one day <br />after wmpletion of drilling. <br />Laboratory Testing <br />All samples retrieved during the field exploration were returned to the laboratory for observation by the <br />project geotechnical engineer and were classified in accordance with the Unified Soil Classification <br />System described in Appendix C. At that time, the field descriptions were confirmed or modified as <br />necessary and an applicable laboratory testing program was formulated to determine engineering <br />properties of the subsurface materials. Boring logs were prepared and are presented in Appendix A. <br />Laboratory tests were conducted on selected soil samples and are presented on the boring logs and in <br />Appendix B. The test results were used for the geotechnical engineering analyses, and the <br />2 <br />