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San Joaquin County <br />Environmental Health Department <br />600 East Main Street <br />Stockton, California 95202-3029 <br />DIRECTOR <br />Donna Heran, REHS <br />PROGRAM COORDINATORS <br />Robert McCiellon, REHS <br />Jeff Carruesco, REHS, RDI <br />Kasey Foley, REHS <br />Linda Turkatte, REHS <br />Website: www.sjgov.orgiehd <br />Phone: (209) 468-3420 <br />Fax: (209) 464-0138 <br /> <br />October 4, 2011 <br />Messrs. Kirk Larson, PG, and Robert Trommer, CHG <br />State Water Resources Control Board <br />Division of Financial Assistance <br />1001 I Street <br />Sacramento CA 95814 <br />Subject. 3032 Waterloo road E, Stockton, CA <br />Annual Five-Year Review Update Response CUF Claim # 14120 <br />San Joaquin County Environmental Health Department (EHD) has received and reviewed <br />the annual five-year review update letter dated 25 August 2011 from Kirk Larson of the <br />State Water Resources Control Board (SWOCB) Cleanup Fund (CUF) for the above- <br />referenced site. The CUF concurred with the EHD that active remediation of the site <br />should continue. <br />The EHD concurs that groundwater extraction (GWE) should continue to remediate <br />impacted groundwater; in just the last reported quarter, 356.8 pounds of total petroleum <br />hydrocarbons quantified as gasoline, 25.8 pounds of benzene and 156 pounds of methyl <br />tert-butyl ether (MTBE) were recovered from groundwater — huge for GWE in San Joaquin <br />County. Soil vapor extraction may have adequately addressed impacted vadose zone soil <br />and GWE may finally be having an effect on contaminant concentrations in groundwater; <br />however the system is not currently in operation as the CUF has allocated only <br />$10,000.00 for corrective action on the site this year. The EHD has categorized the site as <br />interim remediation as the lateral extent of this very large plume has not been fully <br />delineated; a monitoring well approximately 800 feet down-gradient has yielded water <br />samples impacted by MTBE, thought to have originated from the subject site. Although <br />the MTBE concentrations have declined back to non-detectable levels, it is not known if <br />the plume is bypassing that impacted well, which is approximately half way to the <br />municipal well. <br />2011 Five-Year Review Update Response CUF Claim No 14120.doc