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0 <br /> San Joaquin County <br /> ronm <br /> Enviental Health Department DIRECTOR <br /> O Pp u,IN P Donna Heran,REHS <br /> 1868 East Hazelton Avenue <br /> -w ?< Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> m. Robert McClellon,REHS <br /> ` Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> • o ... P • Website: www4gov.org/ehd Linda Turkatte,REHS <br /> q�,F�Rd Phone: (209)468-3420 Rodney Estrada,REHS <br /> Fax: (209)464-0138 Adrienne Ellsaesser,REHS <br /> January 31, 2014 <br /> Messrs. Kirk Larson, PG, and Robert Trommer, CHG <br /> State Water Resources Control Board <br /> Division of Financial Assistance <br /> 1001 1 Street <br /> Sacramento CA 95814 <br /> Subject: 1601 French Camp/Turnpike Road, Stockton, CA <br /> Review Summary Report— Closure (Fourth Review) Response CUF Claim # 18245 <br /> San Joaquin County Environmental Health Department (EHD) has received and reviewed the <br /> Review Summary Report — Closure (Fourth Review), dated 24 December 2013 from Robert <br /> Trommer of the State Water Resources Control Board (SWQCB) Cleanup Fund (CUF) for the <br /> above-referenced site. The CUF has found that the case meets all general and media-specific <br /> criteria for case closure under the Low-threat Underground Storage Tank Closure Policy (LTCP) <br /> and that the case should be closed. <br /> In general, the EHD concurs with the CUF evaluation. The EHD notes that the site does not <br /> quite meet groundwater—specific criteria by class 2 as there is a domestic well approximately <br /> 820 upgradient of the site, but it does not seem likely the well could be impacted by this <br /> unauthorized release. Benzene concentrations have been less than 1,000 micrograms per liter <br /> (Ng/I) since active remediation was initiated in June 2013, but since the system has only been in <br /> operation approximately 7 months, the EHD does recommend at least one quarterly monitoring <br /> event to test for rebound. Significant rebound seems unlikely as the soil vapor extraction rate <br /> has only been approximately 2 pounds per day for some time, so it would not appear to have a <br /> great affect on dissolved concentrations. Review of boring log photo-ionization detector (PID) <br /> data appears to demonstrate minimal petroleum hydrocarbon impact to soil 5 and 10 feet below <br /> surface grade, so the EHD agrees with the CUF evaluation of the vapor intrusion hazard as long <br /> as benzene in groundwater (depth to water recently approximately 16 feet) remains below 1,000 <br /> Ng/l. <br /> The EHD will issue a directive letter to suspend operation of the soil vapor extraction system <br /> and ozone injection system. If the CUF agrees to the EHD suggestions, the EHD will also direct <br /> the rebound testing. If there is no significant rebound, the EHD will initiate case closure actions. <br /> 2013 Review Summary Report Response CUF Claim No 18245.doc <br />