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•San Joaquin County • DIRECTOR <br /> Donna Heran,REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman,REHS <br /> Mike Huggins,REHS,RDI <br /> Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> glivoR`' Phone: (209) 468-3420 Robert McClellon,REHS <br /> Fax: (209) 464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> JAY MCILRATH JUL 2 3 2007 <br /> JC & M MCILRATH <br /> PO BOX 326 <br /> STOCKTON CA 95201 <br /> RE: JAMAR Service SITE CODE: 1667 <br /> 4075 Main Street <br /> Stockton CA 95212 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed Fourth <br /> Quarter 2006 Combined Groundwater Monitoring and Remediation Systems Operations <br /> Report(Report) dated March 29, 2007, and 2nd Quarter groundwater analytical data <br /> posted to Geotracker, both submitted on your behalf by ATC Associates Inc. (ATC) and <br /> has the following comments. <br /> The Report presents a narrative of field activities and remedial system operations, and <br /> the analytical results from samples collected at this site during fourth quarter 2006. In <br /> June 2004 remediation of the groundwater contamination at this site was initiated with <br /> the startup of an ozone infusion system. Groundwater sample analytical results reported <br /> since the system was started have shown a marked decrease in the concentrations of <br /> contaminants in the onsite groundwater monitoring wells located near the source area of <br /> the plume. However, concentrations of contaminants in lateral and offsite wells have not <br /> decreased. <br /> At a site visit in December 2006, during the fourth quarter groundwater monitoring and <br /> sampling event, SJC/EHD and ATC personnel observed an apparent release of ozone at <br /> one of the ozone injection points. ATC field technicians shut down the system, and <br /> noted that the flexible lines delivering the ozone from the generator to the infusion points <br /> were in need of replacement. SJC/EHD has been informed on several occasions that <br /> the site needs to be re-trenched, and all ozone lines replaced, and that this work is <br /> pending. It is the understanding of SJC/EHD that the remediation system has been <br /> offline since December 2006 due to the need to replace these lines. <br /> Please proceed with scheduling the necessary site work to replace the ozone lines and <br /> restart the onsite ozone remediation system. The deadline for the onsite remediation <br /> system to be operational is October 26, 2007. <br /> SJC/EHD has had several discussions with ATC concerning the offsite and lateral <br /> groundwater contamination that is too far away to be affected by the ozone infusion <br /> points. ATC has expressed an intention to expand the groundwater remediation <br /> program and/or method to address these areas. In the Report ATC recommends both <br /> development of a work plan to complete delineation of the offsite plume and to expand <br /> the remediation program. SJC/EHD agrees with these recommendations. <br />