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r' <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> �•• —,a�� 9 <br /> 1868 East Hazelton Avenue Donna Neran,REHS <br /> Q: <br /> Stockton, California 96205-6232 PROGRAM COORDINATORS <br /> r Robert McClellon, REHS <br /> .•'' — Jeff Carruesco, REHS, RDI <br /> c4 �P Website: www.sjgov.org/ehd Kasey Foley,REHS <br /> C�FpR� <br /> Phone: (209) 468-3420 Linda Turkatte,REHS <br /> Fax: (209) 464-0138 <br /> June 19, 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 <br /> Subject: 639 Clay Street, W., Stockton, CA <br /> Annual Five-Year Review Update Response CUF Claim # 8542 <br /> San Joaquin County Environmental Health Department (EHD) has received and reviewed the <br /> fifth annual five-year review update letter, dated May 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 direct the Responsible Party to discontinue monitoring of un- <br /> impacted wells and to continue oxygen sparging to achieve water quality objectives in a timely <br /> manner. <br /> In-situ chemical oxidation (ISCO), utilizing ozone, has been evaluated by bench-scale test and <br /> by a 24-week pilot test in 2006, and the consultant has recommended ozone sparging as a <br /> remedial method for the UST No. 3 area on this site. The EHD has not approved ozone <br /> sparging as a report of findings for the ozone sparging pilot test has not been submitted to either <br /> the EHD or the Central Valley Regional Water Quality Control Board, nor has it been submitted <br /> to GeoTracker. The EHD will not approve proceeding with ozone sparging until a report of <br /> findings for the pilot study has been reviewed. The EHD directed by letter dated 05 April 2012, <br /> submittal of a feasibility study evaluating several techniques, including ozone sparging. <br /> By letter dated 19 December 2011, the EHD had greatly reduced the monitoring/sampling <br /> requirements, including reduced or discontinued sampling of 23 monitoring wells. The EHD <br /> fetter of 05 April 2012 offered to reduce the monitoring/sampling requirement further if provided <br /> a technical justification. Questions or comments should be directed to Vicki McCartney at (209) <br /> 468-9852 or to Nuel Henderson at (209) 468-3436. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel Henderson, PG <br /> Senior Registered Environmental Health Engineering Geologist <br /> Specialist <br /> 2012 Five-Year Review Update Response CUF Claim No 8542.doc <br />