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Top Filling Station <br /> 101 South Wilson Way, Stockton December 2014 <br /> Claim No: 8479 <br /> unlikely that the affected shallow groundwater will be used as a source of drinking water in the <br /> foreseeable future. Other designated beneficial uses of the affected shallow groundwater are <br /> not threatened, and it is highly unlikely that they will be, considering these factors in the context <br /> of the site setting. Remaining petroleum hydrocarbon constituents are limited and stable, and <br /> concentrations are decreasing. Corrective actions have been implemented and additional <br /> corrective actions are not necessary. Any remaining petroleum hydrocarbon constituents do not <br /> 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 does not meet Policy criteria because inadequate <br /> data is available to determine if the contaminant plume that exceeds water quality objectives <br /> is stable. <br /> • Vapor Intrusion to Indoor Air: Onsite, the case meets Policy Criterion 2b. Although no <br /> document titled 'Risk Assessment'was found in the files reviewed, a professional <br /> assessment of site-specific risk from exposure through the vapor intrusion pathway was <br /> performed by Fund staff. The assessment found that there is no significant risk of petroleum <br /> vapors adversely affecting human health. There are no buildings onsite and the pathway is <br /> incomplete. Offsite, the case meets Policy Criterion 2a by Scenario 1. There are high <br /> concentrations of petroleum hydrocarbons in the groundwater. However, the minimum depth <br /> to groundwater beneath the foundation of existing or potential buildings is greater than 30 <br /> feet, overlain by soil containing less than 100 milligrams per kilogram (mg/kg)of TPH. <br /> • Direct Contact and Outdoor Air Exposure: This case meets Policy Criterion 3b. Although no <br /> document titled 'Risk Assessment'was found in the files reviewed, a professional <br /> assessment of site-specific risk from potential exposure to residual soil contamination was <br /> completed by Fund staff. The results of the assessment found that maximum <br /> concentrations of petroleum constituents remaining in soil will have no significant risk of <br /> adversely affecting human health. The Site is paved and accidental exposure to site soils is <br /> prevented. Therefore, the pathway is incomplete. Any construction crew performing <br /> subsurface work will, per the requirements of Title 8 of the California Code of Regulations, <br /> be prepared to deal appropriately with environmental hazards anticipated or encountered in <br /> their normal daily work. The presence of residual contamination should be taken into <br /> account when issuing and executing excavation or building or other permits at the Site, <br /> including but not limited to the inclusion of a Competent Person in the work crew. <br /> Page 2 of 3 <br />