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Super Center Mart March 2014 <br /> 701 East Charter Way, Stockton <br /> Claim No: 12741 <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: <250 feet. <br /> • Plume Stable or Decreasing: Yes. <br /> • Contaminated Zone(s) Used for Drinking Water: No. <br /> • Groundwater Risk from Residual Petroleum Hydrocarbons: The case meets Policy Criterion 1 <br /> by Class 2. The contaminant plume that exceeds water quality objectives is less than 250 feet <br /> in length. There is no free product. The nearest water supply well or surface water body is <br /> greater than 1,000 feet from the defined plume boundary. The dissolved concentration of <br /> benzene is less than 3,000 pg/L, and the dissolved concentration of MTBE is less than <br /> 1,000 pg/L. <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. <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 13 <br />