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f 3 <br /> I <br /> The ST&E site has remaining petroleum hydrocarbons in the soil that appear to meet the minimums <br /> for the ESL's as provided in the above table with the exception of TPH-d. The concentrations of TPH- <br /> d in soil are a maximum of 110 mg/kg. When averaged with other soil samples the estimated average <br /> contaminate mass is estimated to range from 50 to 100 mg/kg. This concentration would be below the <br /> ESL for TPH-d. is <br /> I, <br /> Due to the very low soil concentrations of petroleum hydrocarbon constituents in the limited volume <br /> of remaining contaminated soil left in place in the subsurface and the low vapor pressure of TPHd <br /> and TPHmo constituents, the soil gas exposure issues are not thought to present a exposure risk at <br /> this site. <br /> Based on the table above andremaining TPHd concentrations in the soil the site qualifies as a low-risk <br /> closure candidate. <br /> i <br /> i <br /> I� <br /> it <br /> r <br /> EnvironmentakSTETA RSCR09102008.wpd 29 <br /> f <br />