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Super Center Mart December 2014 <br /> 701 East Charter Way, Stockton <br /> Claim No: 12741 <br /> of the site setting. Remaining petroleum hydrocarbon constituents are limited and stable, and <br /> concentrations are decreasing. <br /> Rationale for Closure under the Policy <br /> • General Criteria: The case meets all eight Policy general criteria. <br /> • Groundwater Specific Criteria: The case may meet Policy criteria but plume stability <br /> must be confirmed by post remediation monitoring. <br /> • Vapor Intrusion to Indoor Air: The case meets the Policy Exclusion for Active Station. <br /> Soil vapor evaluation is not required because the Site is an active commercial petroleum <br /> fueling facility and the release characteristics do not pose an unacceptable health risk. <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 /> Objections to Closure and Responses <br /> According to a November 13, 2014 letter, the County requested two additional rounds of <br /> groundwater monitoring to evaluate post remediation plume stability. <br /> RESPONSE: We concur. <br /> Recommendation <br /> The Fund agrees with the County that the responsible party conduct two more rounds of <br /> groundwater monitoring to evaluate post remediation plume stability. <br /> Ki arson, P.G. Date Robert Trommer, C.H.G. Date <br /> Engineering Geologist Senior Engineering Geologist <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341-5663 (916)341-5684 <br /> Page 2 of 2 <br />