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LFR Inc. regarding the CEQA IS, and providing regulatory oversight regarding hazardous material classification, removal, transportation, and cleanup goals. The RWQCB provides regulatory oversight for issues related to the groundwater quality at the Site; in particular, the RWQCB's role is to ensure that the RAO will provide sufficient protection of groundwater at the Site. 2.0 PREVIOUS INVESTIGATIONS The U.S. Environmental Protection Agency (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 its contractor, EEI, 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 were gathered to determine the extent of contamination at the Site and to characterize waste for removal by the CIWMB. The preliminary RI/FS data were summarized in the "Tracy Tire Fire Site Removal Assessment Report," prepared by EEI and dated October 2002 (EEI 2002). According to the preliminary RI/FS data, elevated concentrations of zinc (>5,000 milligrams per kilogram [mg/kg; class I non-RCRA hazardous waste) were detected in multiple surface soil samples that were collected within the burn pile areas. These results indicated that elevated zinc concentrations were a result of the tire fire and that the extent of the affected soil was limited to the areas where the tires burned. 3.0 LIST OF DELIVERABLES TO DATE The following documents (listed in chronological order) were prepared by LFR (or as noted), submitted to the CIWMB, DTSC, RWQCB, and to the Tracy Public Library (for public viewing), and summarize activities conducted at the Site to date: 1 February 2003 - Health and Safety Plan for Groundwater Well Installation and Sampling Activities at the Tracy Tire Fire Site ("the HSP") • Addendum to the Health and Safety Plan, August 15, 2003 2 March 2003 - Site Grading Plan, Tracy Tire Fire Site 3 April 12, 2003 - Storm Water Pollution & Prevention Plan and Notice of Intent, Tracy Tire Fire Site (prepared by SCI) 4 April 21, 2003 - Site Sampling Plan for Small Waste Disposal Areas, Soil Sampling and Characterization, Tracy Tire Fire Site 5 April 30, 2003 - Analytical Results for Stockpile Soil Samples Collected from Small Waste Disposal Area, Tracy Tire Fire Site, San Joaquin County, California rpt-RA_summ-Nov06-final-09025 Page 5