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San Joaquin County <br /> Pa i N <br /> Environmental Health DepartmentDIRECTOR <br /> Donna Heran,REHS <br /> 2: 1868 East Hazelton Avenue <br /> i <br /> PROGRAM COORDINATORS <br /> Stockton, California 95205-6232 Robert McClellon,REHS <br /> Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> cqC Fo.R; P Website: www.sjgov.org/ehd Linda Turkatte, REHS <br /> Phone: (209)468-3420 Rodney Estrada,REHS <br /> Fax: (209)464-0138 Adrienne Ellsaesser,REHS <br /> May 8, 2013 <br /> Exxon Edna Filippi Family Trust Limited Partnership Etal <br /> c/o Jennifer Sedlachek c/o Bank of Stockton, Rich Correia <br /> 4096 Piedmont Ave. #194 P.O. Box 1110 <br /> Oakland, CA 94611 Stockton, CA 95201 <br /> Subject: Former Exxon Service Station #7-3943 LOP Site Code: 2231 <br /> 4444 Pershing Ave. <br /> Stockton, CA 95207 <br /> The San Joaquin County Environmental Health Department has reviewed Site Conceptual <br /> Model, dated March 4, 2013, prepared by Cardno ERI on your behalf and has the following <br /> comments. <br /> The Site Conceptual Model contains several sections: background information, geology and <br /> hydrogeology, site remediation technologies implemented for soil and ground water cleanup <br /> over the course of the project, site conditions including analytical results (soil, ground water, and <br /> vapor), potential receptors and contaminant expose pathways, conclusion, and <br /> recommendations. <br /> Several remediation technologies have been implemented at this site, but high concentrations of <br /> total petroleum hydrocarbons as gasoline (TPH-g), benzene (B), toluene (T), ethlybenzene <br /> (E),and xylene (X) remain in the soil and the ground water in the former UST field and down- <br /> gradient of the former UST field to the east/northeast. Well V2 was sampled on November 13, <br /> 2012, with TPH-g and BTEX concentrations of 5700 ug/L, 3600 ug/L, 12000 ug/L, 2800 ug/L <br /> and 12,000 ug/L respectively. The ground water and soil concentration in the on-site source <br /> area warrant additional remediation. <br /> Cardno ERI has recommended evaluating the feasibility and cost of injecting oxygen release <br /> compounds or other chemical oxidizers in the source area east of the former UST field. The <br /> chemicals would be placed directly into the highly contaminated soil located approximately 10 to <br /> 20 feet below the current static water level. <br /> Please complete the remediation evaluation and focus on an aggressive approach using the <br /> strongest oxidant that will complete the task in a cost-effective manner. Please submit the <br />