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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> 600 East Main Street <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> R5 <br /> Robert McClellon,REHS <br /> .'• Jeff Carruesco,REHS, RDI <br /> . Website: www.sjgov.org/ehd Kasey Foley. REHS <br /> �l�pR <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> September 15, 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: 850 Milgeo Street, Ripon, CA <br /> Annual Five-Year Review Update Recommendations August 2010 <br /> San Joaquin County Environmental Health Department (EHD) has received and reviewed the <br /> annual five-year review update letter dated 10 August 2010 from Kirk Larson of the State Water <br /> Quality Control Board (SWQCB) Cleanup Fund (CUF) for above referenced site. The CUF <br /> recommends that the EHD direct the Responsible Party (RP) to select an alternative remedial <br /> method other than soil vapor extraction (SVE) due to the relatively low volatility of diesel. <br /> The EHD shares the CUF concern over the use of SVE on the site and has long urged <br /> consideration of excavation to directly address the more intensely impacted soil, but the RP and <br /> the consultant have persisted in favoring SVE, concluding in their corrective action plan that <br /> SVE would be the most effective technology to address impacted soil on the site. As the <br /> proposed pilot test is of limited duration (5 days), involves only an existing well, and should be of <br /> relatively low cost, the EHD has approved the test (EHD letter dated 24 March 2010). Following <br /> review of the final report of investigation for the pilot test, the EHD will direct such action as <br /> seems appropriate. <br /> Questions or comments should be directed to Harlin Knoll at (209) 468-3442 or to Nuel <br /> Henderson at (209) 468-3436. <br /> Sincerely, <br /> Harlin Knoll, REHS Nuel Henderson, PG <br /> Senior Registered Environmental Engineering Geologist <br /> Health Specialist <br /> Annual 5-Year Review Update Response 2010.doc <br />