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2.2--Survey and Mapping <br /> <br /> a. Through aerial photography and photogranunetric <br /> method, compile topographic maps at a scale of 1 <br /> inch equals 40 feet. <br /> <br /> b. Supplement aerial photogrammetric information by <br /> field surveying. <br /> <br /> c. Prepare 20 photo/topographic plan and profile base <br /> sheets of project area. <br /> <br />2.3--Geotechnical Investigation <br /> <br /> a. Review available existing geological information. <br /> <br /> b. Perform field exploration consisting of 17 borings <br /> varying in depth from 25 feet to 45 feet to <br /> evaluate the subsurface conditions. <br /> <br /> c. Perform field and laboratory testing to determine <br /> critical trench and pipe support parameters. <br /> These would include moisture content, dry unit <br /> weight, internal strength, compressibility and <br /> elastic modulus. <br /> <br /> d. Prepare a geotechnical report presenting the <br /> findings, conclusions, and recommendations for the <br /> interceptor design and construction. <br /> <br />2.4--Conduct Field Investigation <br /> <br /> a. Conduct field investigations to verify the <br /> locations, both horizontally and vertically of all <br /> existing structures and utilities along the <br /> recommended interceptor alignment which might <br /> affect construction of the interceptors. <br /> <br /> b. Contact the City's Water System and Sewer System <br /> Maintenance Departments, utility companies, <br /> Alameda County Flood Control and Water <br /> Conservation District, Zone 7, Southern Pacific <br /> and Western Pacific Railroads for utility <br /> information verification along the interceptor <br /> alignment. <br /> <br /> Revised <br /> Exhibit A <br /> City of Pleasanton <br /> April 5, 1988 <br /> Page 5 of 8 <br /> <br /> <br />