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Ld <br /> R EceF <br /> E <br /> ENVIRONMENTAL,INC. 3330 Cameron Park Drive, Ste 550 <br /> Cameron Park, Califtirnia 95682 <br /> OCT1 ' ami (530)676-6004-Fax,(530)676-6005 <br /> September 29, 2005 <br /> Project No, 2001`0103-07 <br /> Mr. Harlin Knoll <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Subject: Site Investigation Work Plan <br /> A. Teichert and Sons Facility <br /> 103 North E Street <br /> Stockton, California <br /> Dear Mr, Knoll: <br /> Stratus Environmental Inc. (Stratus) has prepared this Site Investigation Work Plan (Work <br /> Plan) on behalf of A. Teichert and Sons, Inc. (Teichert) for the former Teichert <br /> maintenance facility Iocated at 103 North E Street in Stockton, California (Figure 1). <br /> Stratus has previously requested closure for this site 1,2°3, but San Joaquin County <br /> Environmental Management Department (SJCEHD).and Regional Water Quality Control <br /> Board RW CB have declined No Further Action FA consideration due to <br /> concentrations of 1,2-dichloroethane (1,2-DCA) in groundwater above the current <br /> Maximum Contaminant Level (MCL) of 0.5 micrograms/liter (gg/L). SJCEHD has <br /> directed that the vertical and lateral extent of the 1;2-DCA impact in groundwater be <br /> further characterized.4 <br /> Based on discussions with SJCEHD and the SJCEHD letter (dated July 29, 2005), Stratus <br /> If has developed this plan to further characterize the subsurface hydrogeologic conditions <br /> and the extent of the 1,2-DCA impact. The proposed plan is an aggressive approach <br /> consisting of multiple phases targeted at further clarifying_ 'our understanding of the site <br /> geology, constraining the lateral and vertical extent of t,2-DCA impact, identifying <br /> potential human exposure pathways,_and implementing remedial actions required to <br /> achieve NFA status, if warranted. <br /> '.Final Closure Report, dated July 20,2001. <br /> 2 Data to Support Closure, dated December 17,2001. <br /> s Additional Information to Support Closure,dated January 25, 2002. <br /> °Letter to Teichert dated July 29,2005, <br /> K:ITeichertl5tockton-1031Work Plansveichert workplan 09-2005.doc <br />