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3.0 SCOPE OF SERVICES The following scope of services was performed as requested by Caltrans in TO No. 10-OA5I00-BG. 3.1 Pre-Field Activities • A pre-work site visit and TO meeting were conducted on April 15, 2003 to observe the work area, review project drawings and mark the proposed boring locations with white paint. Caltrans representative Mr. Gary Gagliolo and Geocon representatives Mr. David Bieber and Mr. John Mattey attended the pre-work meeting. • A Health and Safety Plan (HSP) was prepared concurrently with the Workplan. The HSP provided guidelines on the use of personal protective equipment and the health and safety procedures to be implemented during the field activities. • Geocon obtained drilling permit No. 0033689 from the San Joaquin County Environmental Health Department (SJCEHD) prior to performing the subsurface investigation. A copy of the permit is presented in Appendix A. • Geocon provided 48-hour notification to Underground Service Alert (USA) prior to performing the subsurface investigation(USA ticket number 0134264). • Geocon retained the services of Spectrum Geophysics, a Caltrans-approved and California- licensed geophysical subcontractor, to perform the geophysical surveys to attempt to locate USTs and provide utility location services. • Geocon, a California C57-licensed contractor, provided the drilling equipment and performed the subsurface investigation. • Geocon retained Creek Environmental Laboratories, Inc. of San Luis Obispo, California, a California-certified and a Caltrans-approved subcontractor, to perform the chemical analyses of the soil samples. 3.2 Field Activities Visual and geophysical surveys were performed on May 13, 2003 to locate potential USTs, piping, or other buried facilities. Spectrum Geophysics, performed a ground penetrating radar (GPR) and EM61 electromagnetic (EM) geophysical survey. GPR uses radar imaging to look for buried objects such as tanks or pits. As the GPR data was collected, it was recorded onto the GPR's internal hard drive for storage and review. The EM survey method is the most frequently employed technique to detect underground utilities made of or containing conductive materials such as steel or copper. On May 13, 2003, eight direct-push soil borings (DPI through DP8) and one hand-auger boring (HAI) were advanced to a maximum exploration depth of 3.66 meters (m) (12 feet) below ground surface (bgs). Twenty-seven soil samples were collected from the borings. The soil boring locations are shown on Figure 2. Following sample collection, each boring was backfilled to ground surface with cement grout. Project No S8475-06-70 -3- July 9,2003