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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> 600 East Main Street <br /> PROGRAM COORDINATORS <br /> Stockton, California 95202-3029 <br /> Robert McClellon, REHS <br /> L y YF <br /> .. - =• <br /> Jeff Carruesco, REHS, RDI <br /> r Kasey Foley, REHS <br /> Website: www.sjgov.org/ehd <br /> Linda Turkatte, REHS <br /> Phone: (209)468-3420 <br /> Fax: (209) 464-0138 <br /> October 14, 2011 <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: ' 1419 Charter Way W, Stockton, CA <br /> Annual Five-Year Review Update Response CUF Claim # 11515 <br /> San Joaquin County Environmental Health Department (EHD) has received and reviewed the <br /> annual five-year review update letter dated 12 September 2011 from Kirk Larson of the State <br /> Water Resources Control Board (SWRCB) Cleanup Fund (CUF) for the above-referenced site. <br /> The CUF has recommended that the EHD review the site for closure. <br /> The EHD considers the current array of monitoring wells combined with the predominant <br /> groundwater gradient direction to adequately delineate impacted groundwater, and remediation <br /> by soil vapor extraction appears to have remediated impacted soil in the vicinity of the vapor <br /> extraction wells. In the opinion of the EHD, it is still practicable to remediate the secondary <br /> source of impacted groundwater through continued ozone injection utilizing a reinstalled OZ-4 to <br /> further reduce contaminant mass and concentrations in the hot spot area, but based on the <br /> professional opinion rendered by the CUF Five-Year Review technical staff for site closure, and <br /> in consideration .of the limited reimbursable expenses allowed to sites that have been <br /> recommended for closure consideration by the CUF, and further noting that impacted <br /> groundwater has been reasonably delineated, the EHD will work on site closure. <br /> The EHD has a concern regarding potential vapor intrusion affecting the motel building <br /> approximately 20 feet north of the former tank excavation; there is no soil data between the <br /> motel and the north end of the excavation where total petroleum hydrocarbons quantified as <br /> gasoline (TPHg) were detected at concentrations exceeding 2,000 milligrams per Kilogram <br /> (mg/Kg). To address this issue, the EHD has directed by letter dated 23 February 2011, <br /> collection of confirmation soil gas or soil samples between the motel and the former excavation <br /> to demonstrate a low-risk scenario. Based on the results, if appropriate, the EHD will consider <br /> the site for closure. <br /> 2011 Five-Year Review Update Response CUF Claim No 11515.doc <br />