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LFR Levine-Fricke or any of the subcontractor's workers from the job site. Subcontractors may employ health and safety procedures that afford them a greater measure of personal protection than those specified in this plan so long as they do not pose additional hazards to themselves, the environment, or others working in the area. 5.0 HAZARDS OF KNOWN OR EXPECTED CHEMICALS OF CONCERN The United States 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 the Superfund Technical Assessment Response Team (START) to conduct a removal assessment of the Site. The field sampling activities were conducted from October 15 through December 13, 2001. The purpose of the removal assessment investigation 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 California Integrated Waste Management Board. Soil sampling at the Site was conducted under the guidance of the U.S. EPA in the northwestern portion of the Site from October 15 through 18, 2001. A total of 36 soil samples were collected. Based on data collected during October 2001, 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). Arsenic concentrations in all the soil samples collected exceeded the established preliminary remediation goal (PRG) reference concentration of 2.7 milligrams per kilogram (mg/kg), but were below the arsenic background concentration (4.4 mg/kg) and regional soil reference concentration (4.7 mg/kg). Eight of the 36 soil samples contained high concentrations of metals that indicated potential for leachability. Seven metals from the eight soil samples were analyzed by soluble threshold limit concentration (STLC) and toxicity characteristic leaching procedure (TCLP). Zinc was the only metal of the seven analyzed that significantly exceeded the action level (250 milligrams per liter) for the STLC. No metals exceeded the representative action level for the TCLP. Groundwater samples were collected from the four on-site groundwater monitoring wells (MW-1, MW-2, MW-3, and MW-4) on December 13, 2001. Chemical compounds detected in groundwater samples included aluminum, antimony, arsenic, barium, beryllium, chromium, iron, lead, manganese, nickel, silver, and methyl-tert butyl ether (MtBE). Chemical compounds of potential health concern for site workers and that were detected at higher concentrations are listed below with their respective concentration ranges. Page A-4 HSP-TncyTirnFimGWS=plingJ h