PR0535342 - Laserfiche WebLink

Home Browse Search

sb 2.0 Hazard Characterization 2.1 Previous Assessments Hazard characterization provides the information needed to identify site hazards and to select worker protection methods. The more accurate, detailed, and comprehensive the information available about a site, the more protective measures can be tailored to the actual hazards that workers may encounter. The site history, as well as previous site assessments, are important in determining what the potential soil contaminants and analytical reQuirements are. 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 Remedial Investigation/Feasibiliy Study [RVFS] of the TTFS. Field sampling activities were conducted from October 15 through December 13, 2001. The purpose of the preliminary RVFS was to determine the impact on soil and groundwater Quality at the Site due to the tire fire. Additionally, anaytical data was gathered to determine the extent of contamination at the Site and to characterize waste for removal by the CIWMB. The preliminary RI/FS data is summarized in the "Tracy Tire Fire Site Removal Assessment Report" prepared by EEI and dated October 2002 (EEI 2002). The 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). The preliminary RI/FS investigation noted the following characteristics. 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 was reduced to 1.6 mg/kg. However, it was noted that the background arsenic concentrations (greater than 4 mg/kg) were 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-TI-2-2) collected during the preliminary RVFS contained a significant concentration of VOCs (>4,000 mg/kg) and only two soil samples (TT-TI-2-1 and TT-T3-1-1) contained significant concentrations of oil and grease (>1,000 mg/kg; VOCs and Semi-volatile organic compounds [SVOCs] were not detected above PRGs or SSLs in soil samples collected from the Site. Based on soil characterization results, surface soil beneath the ash has been classified as a non-Resource Conservation and Recovery Act (non-RCRA) hazardous waste due to total metal concentrations and zinc leachability. sb Environmental Services,LLC© October,2003 California Integrated Waste Management Board Site 5pecific Health and Safety Plan Page 8 of 62 Tracy Tire Fire Remediation Project