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LFR Levine-Fricke <br /> 1.2 Site Background <br /> The Site is an approximately 50-acre gravel pit located at 29425 South MacArthur <br /> Road, approximately 3 miles south of the City of Tracy, in San Joaquin County, <br /> California(Figure 1). The Site consists primarily of a former gravel pit located <br /> between two active aggregate mining operations: Teichert Aggregate and RMC Pacific <br /> Materials. Illegal tire storage areas were located within the former gravel quarry, <br /> which is situated below grade with no apparent outflows or surface water. <br /> The Site was owned and operated by Mr. Silas Fred Royster as the Royster Tire <br /> Disposal Facility, an unpermitted waste tire facility, for an undocumented period of <br /> time. An estimated 7,000,000 tires were illegally stored at the Site in conditions <br /> ranging from orderly piles of bundled tires to large piles of unbundled tires and tire <br /> shreds. The facility also stored drums of used oil filters, old vehicles, trailers, and <br /> other miscellaneous debris. <br /> On August 7, 1998, a grass fire started at the Site. The grass fire spread and ignited the <br /> tires. Local fire and police, the San Joaquin County Public Health Services (PHS), <br /> California Environmental Protection Agency(Cal-EPA)Department of Toxic <br /> Substances Control(DTSC), California Air Resources Board(CARB), and the <br /> CIWMB, (collectively -the "unified command")worked together to conduct emergency <br /> response activities from the time the fire was discovered through August 10, 1998. Due <br /> to the site geography and surrounding land use, the unified command elected to allow <br /> the tire fire to burn out over time. County, state, and federal agencies continued to <br /> monitor the fire, which steadily diminished with the exception of three burn areas <br /> which continued to burn for 2 1/2 years. The CIWMB implemented a fire suppression <br /> plan in October 2000. The CIWMB, in coordination with the Tracy Fire Department, <br /> PHS, San Joaquin Valley Air Quality Management District(SJVAQMD), and GARB, <br /> supervised a contractor in extinguishing the remaining areas of fire with foam and <br /> water. <br /> As presented in Figure 2, the Site contains 34 distinct burn-pile areas. The burn-pile <br /> areas have been grouped into three separate work areas (Units 1 through 3) for <br /> managing phased excavation activities. Unit 1 is the northernmost unit and consists of <br /> burn-pile areas 1 through 5. Unit 2 is located adjacent to Unit 1 to the south and <br /> consists of burn-pile areas 6 through 12. Unit 3 is located adjacent to Unit 2 to the <br /> south and east, and consists of burn-pile areas 13 through 34. <br /> Environmental work performed at the Site to assess environmental conditions is being <br /> managed by a partnership of regulatory agencies. The CIWMB serves as the lead <br /> agency and is responsible for overall management of the program including on-site <br /> supervision of the remediation contractor and the environmental consultant. The <br /> Regional Water Quality Control Board(RWQCB)provides regulatory oversight for <br /> issues related to the groundwater quality at the Site and the DTSC is the lead agency <br /> for approving and implementing this RAP, the California Environmental Quality Act <br /> (CEQA) Initial Study, and potential CEQA conservation measures. <br /> Page 2 Final_RAP_Tracy_9.18.03(final).doc <br />