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RESULTS <br /> The results of a Tier 2 RSCA calculation are expressed as SSTLs. This is the concentration at <br /> which, the calculated cancer risk will not exceed the 111,000,000 residential or 1/100,000 <br /> commercial cancer risk and the non-cancer threshold limit is less than one. <br /> Vapor Inhalation <br /> None of the compounds exceeded the SSTLs for Volatilization to outside air. (Appendix A, <br /> Worksheets 9.2.). <br /> Ground Water Ingestion <br /> Benzene and TPHg as Hexane exceeded the SSTLs levels for on-site groundwater ingestion <br /> (Appendix A, Worksheet 9.3.). These levels are not significant as it would require the installation of <br /> a shallow groundwater well into the current plume and the continued drinking of that water. <br /> None of the compounds exceeded. the SSTLs levels for off-site groundwater ingestion (Appendix A, <br /> Worksheet 9.3.) <br /> DISCUSSION <br /> By definition, the SSTLs determine the concentrations at which the site will not pose a significant <br /> risk to the public or the workers at a site. The SSTL only exceeded for onsite ingestion of <br /> groundwater, which is not a probable occurrence. <br /> LIMITATIONS <br /> The information presented in this report is based on the following: <br /> 1. The observations and data collected by field personnel. <br /> 2. Thexesult of laboratory analyzes performed by a state certified analytical laboratory. <br /> 3. Our understanding of the regulations of San Joaquin County, the City of Stockton and the <br /> State of California. <br /> 4. References reviewed for this report. <br /> Changes in groundwater conditions can occur due to variations in rainfall, temperature, local and <br /> regional water use and local construction practices. 'In addition, variations in the soil and <br /> groundwater conditions could exist beyond the points explored in this investigation. <br /> State Certified Laboratory analytical results are included in this report. This laboratory follows EPA <br /> and State of California approved procedures; however, WEGE is not responsible for errors in these <br /> laboratory results. <br /> 15 R603 Update#52/CLOSURE RV 7198 <br />