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Comfort Air 0 • October 2013 <br /> 1607 Turnpike Road, St ickton <br /> Claim No: 15533 <br /> Far Downgradient Well <br /> BENZENE Results for MW12B <br /> 0.s <br /> 0.8 <br /> 0.7 <br /> 0.5 <br /> 0.5 <br /> 0.4 <br /> 0.3 <br /> 0.2 <br /> 0.7 <br /> 0 <br /> le � <br /> �^•^• BENZENE Trend <br /> Evaluation of Current F sk <br /> • Estimate of Hydrocar ion Mass in Soil: Nose-FepeHed: 2t '990 Po✓K S 1 n So i <br /> • Soil/Groundwater tes ad for methyl tert-butyl ether (MTBE): Yes. <br /> • Oxygen Concentratio is in Soil Vapor: None reported. <br /> • Plume Length: <250 eet. <br /> • Plume Stable or Dec asing: Yes. <br /> • Contaminated Zone( Used for Drinking Water: No. <br /> • Groundwater Risk fro n Residual Petroleum Hydrocarbons: The case does not meet Policy <br /> criteria because the e dent of groundwater contamination is undefined south (downgradient) of <br /> MW-8B. <br /> • Indoor Vapor Risk fro n Residual Petroleum Hydrocarbons: The case does not meet Policy <br /> criteria because the n iaximum benzene concentration in groundwater is greater than 1,000 /'"'W,Ot <br /> pg/L and the minimur depth to groundwater is less than 30 feet. 65o <br /> • Direct Contact Risk fr im Residual Petroleum Hydrocarbons: This case meets Policy Criterion <br /> 3b. Although no dOCL ment titled 'Risk Assessment" was found in the files reviewed, a <br /> professional assessm int of site-specific risk from potential exposure to residual soil <br /> contamination found I iat maximum concentrations of petroleum constituents remaining in soil <br /> will have no significa risk of adversely affecting human health. Excavation was conducted to <br /> ten feet. The Site is F aved and accidental exposure to site soils is prevented. <br /> Page 10 of 13 <br />