ARCHIVED REPORTS_PRELIMINARY ASSESSMENT_SITE INVESTIGATION REPORT

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• One soil and soil vapor sample were from a soil boring (B 19) located adjacent to the sewer drain in the radiator shop. The sampling was conducted to assess if soil has been impacted by ethylene glycol. Operations and Maintenance Shop (OMS) • Soil and soil gas samples were collected from one location (B20) adjacent to the vehicle inspection rack located south of the OMS adjacent to the hazardous material storage area. The sampling was performed to assess if petroleum hydrocarbons or VOCs have been released. • Soil and soil gas samples were collected from one location (B21) adjacent to the sump at the washpad and one location (B22) adjacent to the clarifier that is connected to the sump located southeast of the main OMS building. The sampling was performed to assess if releases from the sump or clarifier have occurred. • Soil and soil gas samples were collected from two locations in an unpaved area. One location was adjacent to the hazardous waste storage area (B23), and the other was in the truck parking area (B24). One soil and one soil gas sample from each location were tested from each location to assess if petroleum hydrocarbons or VOCs have been released. • One soil sample was collected from a location in the battery room located inside the OMS (B25). The soil sample was collected to assess if acids or lead have been released. • Soil and soil vapor samples were collected at one location east of the former location of a 10,000-gallon gasoline UST and a 5,000-gallon diesel UST (B26), removed from the OMS in April 1996, and one location east of the former pump island associated with the USTs (B27). 3.2.2 Soil and Soil Vapor Sampling To evaluate soil conditions, most soil borings were advanced using a direct-push sampler; soil samples collected from areas inaccessible to the direct-push drilling rig were collected using hand-augering equipment. Soil samples were selected from cored material collected at a maximum of five foot intervals for field or laboratory analysis, beginning at one to two feet bgs. Soil samples were analyzed in the field using standard field headspace analysis. Field analysis was conducted using a Photovac Model 580B photoionization detector(PID). A sample was selected for laboratory analysis based on field observations and analysis. A Versar geologist was on Site to log each boring as it progressed. The soils encountered were characterized according to the Unified Soil Classification System (ASTM D-2487), and include notations of pertinent characteristics. A geologist registered in the State of California reviewed the drill logs presented in Appendix A. 2187-01/3134-100/MAY26'00 7