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Jamar Service • • December 2013 <br /> 4075 East Main Street, Stockton <br /> Claim No: 14482 <br /> Far Downgradient Well <br /> METHYL-TERT-BUTYL ETHER (MTBE) Results for MW12A <br /> 300- <br /> i <br /> 250 ' <br /> J <br /> 0 200 <br /> 6 150 we <br /> -- <br /> w 100 <br /> seae <br /> 50 I <br /> 0 <br /> �•� METHYL-TERT-BUTYL ETHER(MTBE) --- Trend <br /> Evaluation of Current Risk <br /> • Estimate of Hydrocarbon Mass in Soil: None reported. <br /> • Soil/Groundwater tested for MTBE: Yes. <br /> • Oxygen Concentrations in Soil Vapor: None reported. <br /> • Plume Length: Undefined to the northeast. <br /> • Plume Stable or Decreasing: No. <br /> • Contaminated Zone(s) Used for Drinking Water: No. <br /> • Groundwater Risk from Residual Petroleum Hydrocarbons: The case does not meet Policy <br /> criteria because the contaminant plume is not defined to the northeast, the dissolved <br /> concentrations of MTBE are greater than 1,000 pg/L, and the nearest water supply well is 534 <br /> feet northeast (downgradient) of the Site. <br /> • Indoor Vapor Risk from Residual Petroleum Hydrocarbons: The case meets the Policy <br /> Exclusion for Active Station. Soil vapor evaluation is not required because the Site is an active <br /> commercial petroleum fueling facility and the release characteristics do not pose an <br /> unacceptable health risk. <br /> • Direct Contact Risk from Residual Petroleum Hydrocarbons: This 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 exposure through the direct exposure <br /> pathway was performed by Fund staff. The assessment of site-specific risk from potential <br /> exposure to residual soil contamination found that maximum concentrations of petroleum <br /> constituents remaining in soil will have no significant risk of adversely affecting human health. <br /> The Site is paved and accidental exposure to site soils is prevented. As an active petroleum <br /> fueling facility, any construction worker working at the Site will be prepared for exposure in their <br /> normal daily work. <br /> Page 11 of 14 <br />