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LFR Levine-Fricke 2.0 PRELIMINARY RI/FS The U.S. EPA Emergency Response Section, under the authority of the Comprehensive Environmental Response, Compensation and Liability Act(CERCLA) and Superfund Amendment and Reauthorization Act(SARA), directed their contractor, the Superfund Technical Assessment Response Team(START), to conduct a preliminary RI/FS of the Site. Field sampling activities were conducted from October 15 through December 13, 2001. The purpose of the preliminary RI/FS was to determine the impact on soil and groundwater quality at the Site due to the tire fire. Additionally, analytical data was gathered to determine the extent of contamination at the Site and to characterize waste for removal by the CIWMB. The preliminary R1/FS data is summarized in the "Tracy Tire Fire Site Removal Assessment Report" prepared by EEI and dated October 2002 (EEI 2002). 2.1 Soil The preliminary RI/FS included the collection of 36 soil samples from the Site during October 15 through 18, 2001, under the guidance of the U.S. Environmental Protection Agency (U.S. EPA). Figure 3 shows the locations of ten borings, four surface sampling locations, and two background sampling locations that were advanced during the preliminary RI/FS. Based on data collected during October 2001, it appears that surface soil was adversely affected by the tire fire. The impact to soil appears to be limited to those areas where tires burned. The burned areas contain elevated concentrations of metals(primarily zinc) and some areas of pyrolytic oil derived from melting tires. Soil samples were collected at the ground surface, at 6 to 8 feet below ground surface (bgs), and at 14 to 16 feet bgs from each of the 10 boring locations. Soil samples were analyzed for metals by EPA Method 6010, for volatile organic compounds (VOCs)by EPA Method 8260/5035, for semi-volatile organic compounds (SVOCs)by EPA Method 8270, and for total recoverable petroleum hydrocarbons (TRPH)by EPA Method 9071B. Five of the soil samples were analyzed for dioxins by EPA Method 8290. Tables summarizing the data are included in Appendix E. Surface soil samples were also collected in the southeastern and southwestern corners of the property to assess the site background concentrations. Regional background concentrations are provided in Appendix E from a sample located 5 miles west of the Site. Comparison of the analytical data with regional background concentrations indicate that concentrations of antimony, arsenic, cadmium, cobalt, copper, iron, lead, manganese, and zinc in surface soil samples exceeded regional background concentrations. A few of the deeper samples (6 to 8 feet and 14 to 16 feet bgs) collected exceeded the regional background arsenic concentration,but not the site background concentration for arsenic. Final_RAP_Tracy_9.18.03(final).doc Page 3