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Stallworth Auto Detail October 2013 <br /> 602 California Street W, Stockton <br /> Claim No: 12235 <br /> Downgradient Well <br /> BENZENE Results for MW11 <br /> 10000 <br /> 9000 --- -- -- -- — -- - - - <br /> B000 <br /> 7000 <br /> 6000 " <br /> c 6000 <br /> 4000 <br /> 3000 -- - - - - - - <br /> 2000 - <br /> 1000 - <br /> +� BENZENE + w Trend <br /> Evaluation of Current Risk <br /> • Estimate of Hydrocarbon Mass in Soil: None reported. <br /> • Soil/Groundwater tested for methyl tert-butyl ether (MTBE) : Yes. <br /> • Oxygen Concentrations in Soil Vapor: None reported. <br /> • Plume Length: Unknown . <br /> • Plume Stable or Decreasing : Unknown. <br /> • Contaminated Zone(s) Used for Drinking Water: No. <br /> • Groundwater Risk from Residual Petroleum Hydrocarbons: The case does not meet the Policy <br /> groundwater specific criteria because the extent of contamination is not defined. <br /> • Indoor Vapor Risk from Residual Petroleum Hydrocarbons: The case does not meet Policy <br /> criteria because the maximum benzene concentration in groundwater is greater than <br /> 1 , 000 pg/L and the minimum depth to groundwater is less than 30 feet. <br /> • Direct Contact Risk from Residual Petroleum Hydrocarbons: The case meets Policy Criterion <br /> 3b. Although no document titled 'Risk Assessment" was found in the files reviewed , a <br /> professional assessment of site-specific risk from potential exposure to residual soil <br /> contamination found that maximum concentrations of petroleum constituents remaining in soil <br /> will have no significant risk of adversely affecting human health . The Site is paved and <br /> accidental exposure to site soils is prevented . <br /> Page 9 of 12 <br />