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Sierra Lumber Case#2 July 2014 <br /> 375 Hazelton Avenue, Stockton <br /> Claim No: 8478 <br /> impacted groundwater are not threatened, and it is highly unlikely that they will be, considering <br /> these factors in the context of the site setting. <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 the <br /> contaminant plume that exceeds water quality objectives is not defined. <br /> • Vapor Intrusion to Indoor Air: 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 <br /> petroleum vapors adversely affecting human health. The Site is paved and accidental <br /> exposure to site soils is prevented. The onsite building is a warehouse with multiple <br /> rollup doors that would prevent the accumulation of soil vapors in the building. In <br /> addition, as an active lumber mill, there is adequate air exchange provided by the <br /> building's ventilation systems required to control dust generated during site activities. <br /> • Direct Contact and Outdoor Air Exposure: The case meets Policy Criterion 3a. <br /> Maximum concentrations in soil are less than those in Policy Table 1 for <br /> Commercial/Industrial use, and the concentration limits for a Utility Worker are not <br /> exceeded. There are no soil sample results in the case record for naphthalene. <br /> However, the relative concentration of naphthalene in soil can be conservatively <br /> estimated using the published relative concentrations of naphthalene and benzene in <br /> gasoline. Taken from Potter and Simmons (1998), gasoline mixtures contain <br /> approximately 2 percent benzene and 0.25 percent naphthalene. Therefore, benzene <br /> can be used as a surrogate for naphthalene concentrations with a safety factor of eight. <br /> Benzene concentrations from the Site are below the naphthalene thresholds in Policy <br /> Table 1. Therefore, the estimated naphthalene concentrations meet the thresholds in <br /> Table 1 and the Policy criteria for direct contact by a factor of eight. It is highly unlikely <br /> that naphthalene concentrations in the soil, if any, exceed the threshold. <br /> Page 2 of 3 <br />