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LFR Levine-Fricke EXECUTIVE SUMMARY This Remedial Action Plan(RAP)for Pyrolytic Oil-and Metals-Affected Soil at the Tracy Tire Fire(TTF) site (Royster Tire Disposal Facility; "the Site") is being submitted to the California Integrated Waste Management Board(CIWMB) in compliance with the provisions set forth in the California Health and Safety Code (HSC), Section 25356.1. This RAP was prepared in accordance with the Department of Toxic Substances Control (DTSC)Policy/Procedures, Document#EO-95-007-PP (DTSC 1995)and identifies a preferred alternative for an interim remedial action and explains the reasons for the preference. Additionally, descriptions of other remedial alternatives considered for this site are included. Appendix A is a summary of the Administrative Records List associated with the RAP. Appendix B contains the Statement of Reasons for conducting this RAP. Appendix C presents the Non-Binding Allocation of Responsibility. Appendix D contains California Environmental Quality Act(CEQA) Negative Declaration. The Site is located at 29425 South MacArthur Road, approximately 3 miles south of the City of Tracy, in San Joaquin County, California(Figure 1). The 50-acre Royster Tire Storage Facility, where the fire occurred, consists primarily of a former gravel pit located between two active aggregate mining operations: Teichert Aggregate and RMC Pacific Materials. The illegal tire storage areas were located within the former gravel quarry that is situated below grade with no apparent outflows or surface water. The Preliminary Remedial Investigation/Feasibility Study(RI/FS) included sampling of soil at the Site and was conducted under the guidance of the U.S. Environmental Protection Agency (U.S. EPA) from October 15 through 18, 2001. A total of 36 soil samples were collected. Soil sampling results indicated that concentrations of antimony, arsenic, cadmium, cobalt, copper, iron, lead, manganese, and zinc exceeded background concentrations (Ecology and Environment, Inc. [EEI] 2002). Appendix E contains the laboratory analytical data from the preliminary RI/FS investigation. Arsenic concentrations in the soil samples collected exceeded the 2000 preliminary remediation goal(PRG)reference concentration of 2.7 milligrams per kilogram(mg/kg). Since then, the PRG has been reduced to 1.6 mg/kg. However, it should be noted that the background arsenic concentrations (greater than 4 mg/kg) are also above the PRG. Concentrations of metals other than arsenic were reported below their respective PRGs. The U.S. EPA also compared the metals analysis data to the U.S. EPA's soil screening levels (SSLs)to assess the potential for metals to leach and affect groundwater. Arsenic, antimony(estimated results), cadmium, total chromium, and zinc exceeded their respective SSLs. Only one soil sample (TT-T1-2-2)collected during the preliminary RI/FS contained a significant concentration of VOCs (>4,000µg/kg)and only two soil samples (TT-T1- 2-1 and TT-T3-1-1)contained significant concentrations of oil and grease(>1,000 mg/kg; see Appendix E for data). VOCs and SVOCs were not detected above PRGs or SSLs in soil samples collected from the Site. Final_RAP_Tracy_9.18.03(final).doc Page iii