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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> 0 <br /> 2,.• .G Donna Heran,REHS <br /> 2 1868 East Hazelton Avenue <br /> A { Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> 1 mum- ` Robert McClellon,REHS <br /> Jeff Carruesco, REHS,RDI <br /> cq., �:,.•�P Kasey Foley, REHS <br /> F O Ra Website: www.sjgov.org/ehd Linda Turkatte, REHS <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> October 17, 2012 <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 CUF Claim No. 17179 <br /> Subject: 15 East Grant Line Road, Tracy, CA <br /> Fourth Five-Year Review Recommendations February 2012 <br /> San Joaquin County Environmental Health Department (EHD) has received and reviewed the <br /> fourth five-year review letter stamp-dated 22 February 2012 from Kirk Larson of the State Water <br /> Resources Control Board (SWRCB) Cleanup Fund (CUF) for the above-referenced site. The <br /> CUF recommended that the EHD consider the site for closure. <br /> The EHD has been considering the site for closure, but the site has extremely high <br /> concentrations of total petroleum hydrocarbons quantified as gasoline (TPHg) in soil gas, with <br /> concentrations as high as 3,700,000 micrograms per cubic meter (pg/m3). Concentrations this <br /> high, verified with samples analyzed by both a mobile laboratory and a fixed laboratory, greatly <br /> exceed the California Human Health Screening Levels (CHHSLs) for TPHg. The EHD has <br /> unsuccessfully pushed to have the actual human health hazard posed by the high TPHg vapor <br /> concentrations evaluated utilizing site-specific conditions; however, the recently adopted Low <br /> Threat Closure Policy (LTCP) states that the health hazard posed through vapor intrusion at <br /> active fueling stations is negligible compared to those posed by spills and the fueling operation <br /> and need not be evaluated except in extreme circumstances. Based on the standard of practice <br /> established by the LTCP and the professional opinion expressed by the CUF Five-Year Review <br /> that the site should be closed, the EHD will forego the site-specific health hazard evaluation and <br /> will initiate the closure process. <br /> Questions or comments should be directed to Vicki McCartney at (209) 468-9852 or to Nuel <br /> Henderson at (209) 468-3436. <br /> Sincerely, <br /> artney•%��G"� Nuel Henderson, PG <br /> icki McC , REHS <br /> Senior Registered Environmental Engineering Geologist <br /> Health Specialist <br /> 2012 Five-Year Review Comment Letter CUF No 17179.doc <br />