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San Joaquin County DIRECTOR <br /> Po N Donna Heran,REHS <br /> ,0. Environmental Health Department <br /> G I' ASSISTANT DIRECTOR <br /> z ` 2 600 East Main Street Laurie Cotulla,REHS <br /> Stockton, California 95202-3029 <br /> € PROGRAM COORDINATORS <br /> Carl Borgman,REHS <br /> .sjgov.org/ehd Mike Huggins!REHS,RDI <br /> Website: www <br /> i F o R N Margaret Lagorio,REHS <br /> Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209)464-0138 Jeff Carruesco,RENS,RDI <br /> Kasey Foley,REHS <br /> June 30,2008 <br /> i <br /> I <br /> Mr.Wesley Parkinson <br /> Parkinson's 1-5 ARCO Service Station <br /> 3250 West Hammer Lane <br /> Stockton, California 95209 <br /> Subject: Parkinson's I-5 ARCO Service Station <br /> 3250 West Hammer Lane <br /> Stockton, California 95209 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Quarterly <br /> Groundwater Monitoring Report, First Quarter 2008,for Parkinson's Hammer I-S ARCO, 3250 <br /> West Hammer Lane, Stockton, California, Site Code 2224, dated April 14, 2008, prepared and <br /> submitted by Stratus Environmental, Inc. (Stratus) on your behalf. In the report, Stratus states <br /> that a meeting that includes the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) and the EHD is anticipated to be held during the second quarter 2008, to discuss <br /> ozone injection at the above-referenced site. It is the end of the second quarter 2008, and a <br /> meeting with the EHD hasyet to be scheduled. <br /> By letter dated May 27, 2005, the EHD conditionally approved the installation of an ozone <br /> microsparge system, contingent upon first.receiving approval from the CVRWQCB. Of concern, i <br /> is the degradation of groundwater quality caused by ozone injection. For the CVRWQCB to <br /> evaluate the necessity to issue a waste discharge requirement (WDR) permit, you must perform <br /> an ozone bench-scale test to identify andevaluate.generation, mobilization, or precipitation of <br /> _ harmful chemical species that could degrade groundwater or aquifer quality. Effective 2008, <br /> instead of the CVRWQCB evaluating the results from the bench-scale test, the EHD is" i <br /> responsible for reviewing bench-scale test work plans for evaluation of the effects of injecting <br /> oxidizers into the subsurface. <br /> Considering that more than three years have past since the EHD first approved ozone injection as <br /> a remedial method to remove contaminants of concern at your site, and considering the <br /> groundwater flow direction has historically been toward the east-northeast, indicating the j <br /> hydrocarbon plume at your site may be migrating offsite toward the adjacent property where an <br /> ozone system has been in operation since May 25, 2004, you are directed to submit a work plan <br /> for a bench-scale test to the EHD no later than August 29, 2008. The Interstate Technology and <br /> i <br /> I <br /> i <br /> f <br /> i <br />