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PUBLIC HEALTH SERVICES <br /> SAN JOAQ1AN COUNTY <br /> ENVIRONMENTAL HEALTH DMSION <br /> Karen FLirst, M D , M PH , Health Officer *1F <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 <br /> OCT 0 2 2001 <br /> ED RALSTON <br /> PHILLIPS 66 MARKETING COMPANY <br /> 1380 LEAD HILL ROAD SUITE 120 y, � ' <br /> ROSEVILLE CA 95661 <br /> RE Tosco 76 Service Station 5886 OCT 2001 <br /> 2701 March Lane <br /> Stockton, Cal-forma �L <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD)has reviewed the"Corrective <br /> Action Plan"(CAP),dated September 25, 2001,written by Environmental Resolutions,Inc on your behalf The CAP <br /> consists of a proposed ozone nucrosparge system that will use ten air sparge wells with each well drilled to <br /> approximately 20 to 30 feet below ground surface The radius of influence for each well is expected to be about 30 feet <br /> The CAP is approved as written Prior to implementing the CAP,a 30-day public continent period is required A <br /> public participation notice will be posted on the third floor of the San Joaquin County PHS/EHD offices on October 2, <br /> 2001 After the 30 days have passed and providing that the CAP does not need to be revised due to public comment, <br /> you may begin the installation of the proposed ozone microsparge system <br /> Be aware that ozone microsparge systems installed at other San Joaquin sites(specifically,437 Miner in Stockton) <br /> resulted in hydrocarbon contaminant concentrations detected in upgradient monitoring wells that were previously"non- <br /> detect"in these constituents As with any new technology,vigilant monitoring of adjacent groundwater monitoring <br /> wells will be required at Service Station 5886 to ensure that the contaminant of concern(methyl tertiary butyl ether) is <br /> successfully destroyed and not just migrating to anew location in the subsurface You will also need to cease the <br /> weekly purging of impacted groundwater that has been used for interim remediation at the site Although the periodic <br /> purging of monitoring well MW-3 and the underground storage tank cavity well has had some success, it should not be <br /> used in conjunction with the more aggressive ozone microsparge system,lest it interfere with the successful operation <br /> of the remedial system <br /> As you know,I have resigned from San Joaquin County to pursue other employment opportunities, effective October 3, <br /> 2001 Please address all furure correspondence to Margaret Lagono, Super-,isuig REHS at PHSIEHD You inay reach <br /> her by phone at(209)468-3449 <br /> Donna Heran,RENS,Director <br /> Environmental Health Services <br /> Dot Lofstrom,R G <br /> LOP/Site Mitigation <br /> cc yarty Hartzell,CVRWQCB <br /> leim Matteucci, Environmental Resolutions Inc <br /> • <br /> A Dtvision of San Joaquin County Health Care Services <br />