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San Joaquin County <br /> p Pp U,I nr DIRECTOR <br /> Environmental Health DepartmentRECTOR <br /> 600 East Main Street Donna Heran,REHS <br /> �' ?-� PROGRAM COORDINATORS <br /> m: ''' < Stockton, California 95202-3029 <br /> Margaret Lagorio,REHS <br /> -- — Robert McClellon,REHS <br /> • �' tP • Website: www.s ov.or ehd Jeff Carruesco,REHS,RDI <br /> FpR�a /g Kasey Foley,REHS <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> 23 December 2009 <br /> Mr. Carl W. Knowles, Successor Trustee <br /> Knowles Family Trust Agreement <br /> P.O. Box 640 <br /> Woodbridge, CA 95258 <br /> Subject: 102 S Wilson Way <br /> Stockton, CA <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Request for Case Closure (RCC), dated 14 December 2009 and signed by you, formally <br /> requesting case closure for the above-referenced site. <br /> The EHD has reviewed the RCC and the copies you enclosed in the RCC of the preliminary and <br /> final State of California State Water Resources Control Board Order WQO 2004-0005. In the <br /> RCC, you state the following: <br /> • "The County has not demonstrated adequate evidence to support that groundwater <br /> contamination originated from an unauthorized release of the underground storage tanks <br /> previously located at 102 S. Wilson Way."; <br /> • "As it pertains to the site at 102 S. Wilson Way, the only logical explanation for the <br /> presence of MTBE and other oxygenates in the groundwater is that contamination was <br /> caused by an unauthorized release occurring at another site located along this single <br /> groundwater plume."; and <br /> • 'Based on available evidence, it is not reasonable to designate the Knowles Family Trust <br /> as a responsible party for any further contaminant remediation." <br /> The RCC contains a lengthy section regarding the occurrence of methyl tert-butyl ether (MTBE) <br /> and other oxygenates locally detected in contaminated groundwater on your site as evidence <br /> that the contamination did not originate from your site, as expressed in your statement in the <br /> section on MTBE: <br /> "Since the underground storage tanks were removed from the site prior to the introduction of <br /> MTBE and the groundwater beneath the site contains a significant presence of MTBE, logic <br /> dictates that the majority, if not all, of the groundwater contaminants, including all presence <br /> of MTBE, is the result of unauthorized release(s) occurring at a different site." <br /> You question the interpretation, attributed to the EHD, that 1,2-dichloroethane (1,2-DCA) <br /> resulted from an unauthorized release that occurred at this site, stating that "this does not <br /> constitute adequate evidence of responsibility". <br /> Site Closure Request Response 1209 <br />