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Corrective Action Plan 12 <br /> Time Oil Company Property No 04-049, 14000 East Highway 88 Lockeford CA September 8 199$ <br /> data from MW-8 The thickness of on-site impacted soils was increased from the <br /> Tier I default of 9 8 feet to 55 feet <br /> The Tier 1 soil density value of 1 7 g/cm3 was reduced to 1 5 g/cm3, a value more <br /> representative of lithologies encountered at the site <br /> All other input parameters, toxicity data, and chemical data are identical to those recommended <br /> by and presented in ASTM E-1739-95 The chemical and toxicological values used for all <br /> constituents are provided in Appendix D No exposure or chemical parameters were changed <br /> from Tier 1 values Input and output sheets for the Tier 2 analysis are provided in Appendix D <br /> Results of the Tier 2 analysis are summarized in Table 8 These results indicate that site-specific <br /> concentrations of benzene and toluene in soil, and benzene in groundwater, exceed Tier 2 SSTLs <br /> These results indicate that remediation is required to reduce benzene and toluene concentrations <br /> below the levels presented in Table 8 <br /> The SSTLs presented in Table 8 may be modified in the future if analysis for site-specific <br /> physical parameters (e g porosity, moisture content, fractional organic carbon) is conducted If <br /> site-specific physical parameter analysis is conducted, these values can be used to refine the Tier <br /> 2 analysis and more accurately predict potential risk, and thus SSTLs <br /> rime OtllLockeford\CAP wpd <br />