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• • <br /> Pacific Car Wash March 2014 <br /> 4405 Pacific Avenue, Stockton <br /> Claim No: 12325 <br /> Far Down radient Well <br /> BENZENE Results for MW10A <br /> 3.5- <br /> 3- <br /> 2.5 <br /> .sg 2.5 - - <br /> 2 <br /> 1.5 <br /> 0.5. <br /> Q •i sh f �� �.s•, i�1 is v <br /> ~ ' <br /> �•� BENZENE 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: <1,000 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 5. Reportedly, two domestic water supply wells lie within 1,000 feet of the defined <br /> plume boundary. One well is 250 feet east and the second well is 400 feet west of the Site. <br /> Water is provided to water users near the Site by the Stockton East Water Department and the <br /> California Water Service. Otherwise, the case meets Policy Criterion 1 by Class 4. The <br /> contaminant plume that exceeds water quality objectives is less than 1,000 feet in length. <br /> There is no free product. The nearest surface water body is greater than 1,000 feet from the <br /> defined plume boundary. The dissolved concentrations of benzene and MTBE are each less <br /> than 1,000 pg/L. The regulatory agency determines, based on an analysis of site specific <br /> conditions, which under current and reasonably anticipated near-term future scenarios, the <br /> contaminant plume poses a low threat to human health and safety and to the environment and <br /> water quality objectives will be achieved within a reasonable time frame <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 /> Page 12 of 15 <br />