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Gillies Trucking December 2014 3931 Newton Road, Stockton Claim No: 1129 considering these factors in the context of the site setting. Remaining petroleum hydrocarbon constituents are limited and stable, and concentrations are decreasing. Corrective actions have been implemented and additional corrective actions are not necessary. Any remaining petroleum hydrocarbon constituents do not pose a significant risk to human health, safety or the environment. Rationale for Closure under the Policy • General Criteria: The case meets all eight Policy general criteria. • Groundwater Specific Criteria: The case meets Policy Criterion 1 by Class 5. There is a public water supply well approximately 750 feet east (downgradient)of the defined plume boundary. Otherwise, the case meets Policy Criterion 1 by Class 2. The contaminant plume that exceeds water quality objectives is less than 250 feet in length. There is no free product. The nearest surface water body is greater than 1,000 feet from the projected plume boundary. The dissolved concentration of benzene is less than 3,000 micrograms per liter (Ng/L) and the dissolved concentration of methyl tert-butyl ether(MTBE) is less than 1,000 pg/L. Water quality objectives have been achieved or nearly achieved for all constituents of concern except TPHd. The regulatory agency determines, based on an analysis of site specific conditions, which under current and reasonably anticipated near-term future scenarios, the contaminant plume poses a low threat to human health and safety and to the environment and water quality objectives will be achieved within a reasonable time frame. • Vapor Intrusion to Indoor Air: The case meets the Policy Exclusion for Active Station. Soil vapor evaluation is not required because the Site is an active commercial petroleum fueling facility and the release characteristics do not pose an unacceptable health risk. • Direct Contact and Outdoor Air Exposure: This case meets Policy Criterion 3b. Although no document titled 'Risk Assessment"was found in the files reviewed, a professional assessment of site-specific risk from exposure through the direct exposure pathway was performed by Fund staff. The assessment of site-specific risk from potential exposure to residual soil contamination found that maximum concentrations of petroleum constituents remaining in soil will have no significant risk of adversely affecting human health. The Site is paved and accidental exposure to site soils is prevented. As an active petroleum fueling facility, any construction worker working at the Site will be prepared for exposure in their normal daily work. Objections to Closure and Responses According to the Path to Closure page in GeoTracker, finalized on April 24, 2014, the County objects to UST case closure because: • The case does not meet Policy groundwater criteria. RESPONSE: The case meets Policy Criterion 1 by Class 5. • The case does not meet Policy vapor criteria. RESPONSE: The case meets the Policy Exclusion for Active Station. Determination The Fund Manager has notified the tank owners or operators and reviewed the case history of their tank case. The Fund Manager determines that closure of the tank case is appropriate based upon that review. The Fund Manager has prepared this review summary report summarizing the reasons for this determination, provided the Review Summary Report to the applicable Regional Water Board and Local Oversight Agency Program, as appropriate, with an opportunity for comment on the Review Summary Report. Page 2 of 3