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k <br /> v <br /> San Joaquin County <br /> Environmental 'Health Department DIRECTOR <br /> �p � cp` r". Donna Heran, REHS <br /> 600 East Main:Street; - pROGRAM COORDINATORS <br /> I Stockton, California 95202-3029 Margaret Lagono,REHS' <br /> t ` Robert McClellon,REHS. <br /> �k _ '' - Jeff Carruesco,REHS,RDI <br /> c c Website; www.sjgov.org/ehd Kasey Foley, REHS <br /> '9�,FORc� Phone: (209)468-3420 <br /> Fax: (209) 464-0138 <br /> November 3, 2009 <br /> Denis L. Brown <br /> Shell Oil Products <br /> 20945 S. Wilmington <br /> 1, Carson, CA 90810-1039 <br /> Subject: Former Shell <br /> i 880 Victor Road <br /> Lodi, CA <br /> The San Joaquin County Environmental Health Department (EHD)has reviewed the <br /> Remediation System Shutdown Request dated October 6, 2009, prepared by <br /> Conestoga-Rovers & Associates for the above subject site. The EHD approves of <br /> discontinuing operation of the'groundwater extraction system with the following <br /> conditions. Groundwater samples are to be collected monthly from monitoring wells <br /> MW4, MW7 and P1 for three consecutive months and analyzed for MTBE, TBA and <br /> TPH as gasoline. If sample results indicate the contaminant concentrations are stable <br /> f or declining, then samples from these three wells can be collected and analyzed <br /> quarterly. If the contaminant concentrations increase, then operation of the <br /> groundwater extraction system should resume. After six months of sample results that <br /> are stable or declining, a final decision on shut down of the system will be provided by <br /> the EHD. <br /> i <br /> The EHD recommends that batch extraction of groundwater from monitoring well MW7 <br /> be performed monthly during this time to prevent further migration of contaminants off-. <br /> site to the southeast and reduce contaminant concentrations in that area of the site. <br /> I <br /> If you have any questions or comments, please contact me at (209) 468-3449 or Harlin <br /> Knollat (209) 468-3442. <br /> V <br /> Margaret Lagorio, REHS <br /> 1 <br /> Program Coordinator <br /> cc: James L. Barton, CVRWQCB <br /> Ann Rosecrance, Conestoga-Rovers & Assoc., Inc., 19449 Riverside Drive, <br /> Suite 230, Sonoma, CA 95476 <br /> Sukh C & Perminder K Singh, 880 Victor Rd., Lodi 95240 <br /> r <br />