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Y , <br /> Pacific Car Wash March 2014 <br /> 4405 Pacific Avenue, Stockton <br /> Claim No: 12325 <br /> and the second well is 400 feet west of the Site. Water is provided to water users near the Site by <br /> the Stockton East Water Department and the Califomia Water Service. The affected groundwater <br /> is not currently being used as a source of drinking water, and it is highly unlikely that the affected <br /> groundwater will be used as a source of drinking water in the foreseeable future. Other designated <br /> beneficial uses of impacted groundwater are not threatened, and it is highly unlikely that they will <br /> be, considering these factors in the context of the site setting. Remaining petroleum hydrocarbon <br /> constituents are limited and stable, and concentrations are decreasing. Corrective actions have <br /> been implemented and additional corrective actions are not necessary. Any remaining petroleum <br /> hydrocarbon constituents do not pose a significant risk to human health, safety or the environment. <br /> Rationale for Closure under the Policy <br /> • General Criteria: The case meets all eight Policy general criteria. <br /> • Groundwater Specific Criteria: The case meets Policy Criterion 1 by Class 5. Reportedly, <br /> two domestic water supply wells lie within 1,000 feet of the defined plume boundary. One <br /> well is 250 feet east and the second well is 400 feet west of the Site. Water is provided to <br /> water users near the Site by the Stockton East Water Department and the California Water <br /> Service. Otherwise, the case meets Policy Criterion 1 by Class 4. The contaminant plume <br /> that exceeds water quality objectives is less than 1,000 feet in length. There is no free <br /> product. The nearest surface water body is greater than 1,000 feet from the defined plume <br /> boundary. The dissolved concentrations of benzene and methyl tert-butyl ether(MTBE) are <br /> each less than 1,000 micrograms per liter(Ng/L). The regulatory agency determines, based <br /> on an analysis of site specific conditions, which under current and reasonably anticipated <br /> near-term future scenarios, the contaminant plume poses a low threat to human health and <br /> safety and to the environment and water quality objectives will be achieved within a <br /> reasonable time frame. <br /> • Vapor Intrusion to Indoor Air: The case meets the Policy Exclusion for Active Station. Soil <br /> vapor evaluation is not required because the Site is an active commercial petroleum fueling <br /> facility and the release characteristics do not pose an unacceptable health risk. <br /> • Direct Contact and Outdoor Air Exposure: This case meets Policy Criterion 3b. Although <br /> no document titled "Risk Assessment'was found in the files reviewed, a professional <br /> assessment of site-specific risk from exposure through the direct exposure pathway was <br /> performed by Fund staff. The assessment of site-specific risk from potential exposure to <br /> residual soil contamination found that maximum concentrations of petroleum constituents <br /> remaining in soil will have no significant risk of adversely affecting human health. The Site <br /> is paved and accidental exposure to site soils is prevented. As an active petroleum fueling <br /> facility, any construction worker working at the Site will be prepared for exposure in their <br /> normal daily work. <br /> Objections to Closure and Responses <br /> By January 29, 2014 letter, the County recommends that rebound monitoring is conducted <br /> following the cessation of active remediation. Monitoring should include the sampling of nearby <br /> domestic wells. <br /> RESPONSE: We concur. <br /> Page 2 of 15 <br />