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San Joaquin County <br /> DpQ.u�N._ C #, <br /> Environmental Health Department DIRECTOR <br /> 2 Donna Heran, REHS <br /> . 6QQ East Main Street <br /> Stockton, California 95202-3029 PROGRAM COORDINATORs <br /> s <br /> Robert McClellon, REHS <br /> C' _. 'P Jeff Garruesco, REHS, RDI <br /> Ci i o•oN" Website: www.sjgov.org/ehd Kasey Foley, REHS <br /> Phone: (209) 468-3420 Linda Turkatte, REHS <br /> Fax: (209)464-0138 <br /> October 14, 2010 <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: 932 Hwy 99 S, Ripon, CA <br /> Annual Five-Year Review Update Recommendations August 2010 <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> the annual five-year review update letter dated 09 September 2010 from Kirk Larson of the <br /> State Water Quality Control Board (SWQCB) Cleanup Fund (CUF) for the above-referenced <br /> site. The CUF recommends that. the EHD consider closure for this site. The EHD has been <br /> considering closure for this site and has attempted to resolve a soil gas data issue to show that <br /> there is little potential for vapor intrusion associated with the unauthorized release from the <br /> underground storage tank system formerly on the site. <br /> Soil gas samples collected at the site for the vapor intrusion evaluation, analyzed by a GC/MS <br /> method for total petroleum hydrocarbons quantified as diesel (TPHd), were reported as non- <br /> detect at 20,000 micrograms per cubic meter, however a calibration curve for diesel was not run <br /> on the instrument. The EHD has attempted to resolve the data quality issue with the consultant <br /> and with the Central Valley Regional Water Quality Control Board. It is anticipated that the data <br /> TPHd will be found to be acceptable or that the soil gas will be resampled. As soon as it is <br /> shown, with reliable data, that vapor intrusion does not pose a significant hazard, the EHD will <br /> move the site promptly toward closure. <br /> Questions or comments should be directed to Victoria McCartney at (209) 468-9852 or to Nuel <br /> Henderson at (209)468-3436. <br /> Sincerely, <br /> Victoria McCartney, REHS Nuel Henderson, PG <br /> Senior Registered Environmental Engineering Geologist <br /> Health Specialist <br /> Annual 5-Year Review Update Response 2010.doc <br />