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Advanced <br /> t <br /> 12 June 2006 <br /> AGE-NC Project No. 97-0290 <br /> Ms. Lori Duncan <br /> San Joaquin County- Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Closure Summary Report-Addendum 2006 <br /> Lodi Theater Project-107 North School Street,Lodi, California <br /> Dear Ms. Duncan: ' <br /> Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Closure Summary Report - <br /> Addendum for the dissolved.petroleum detection at 107 North School Street,Lodi,California(site). <br /> Remediation of impacted soil and ground water at the site was implemented through soil vapor <br /> extraction and air-sparging programs over a multi-year time span. In general, a reduction of <br /> concentrations of total petroleum hydrocarbons and volatile organic compounds has been achieved. <br /> As requested by the San Joaquin County Environmental Health Department(SJCEHD),a modified <br /> table of historical analytical detections is presented,with the dissolved concentrations of 1,2-DCA <br /> (1,2-dichloroethane). Additionally, analysis for the fuel additive 1,2-dibromoethane (EDB) was <br /> included in historical chemical analysis of the ground water at the site and was consistently non- <br /> detect. <br /> As part of the historical ground water analysis from the site,a full scan of the ground water by EPA <br /> Method 8260 was performed and included in reports previously submitted. On-site, the detections <br /> of 1,2-DCA in samples from MW-2 have decreased significantly over the remediation time period <br /> from a concentration of 540 micrograms per liter(µg/1; 1999)to 1.1 gg/1(2006).This data indicates <br /> a greater than 99% reduction of 1,2-DCA on-site. Off-site, samples from well MW-4 indicated a <br /> declining concentration of 1,2-DCA;initially reported at 370 gg/l,concentrations were most recently <br /> 25 µg/1.Based upon data from on-and off-site,it appears that concentrations of 1,2-DCA are stable <br /> or declining. <br /> The detections of tetrachloroethene (PCE) and trichloroethene (TCE) in samples collected from <br /> wells surrounding the site(MW-7 and MW-B)very likely indicate"localized"concentrations of the <br /> regional Lodi ground water investigation,which encompasses the site.As a potential by-product of <br /> the decomposition of TCE, the detection of 1,2-DCA at 25 µg/l near the site is not likely to cause <br /> further degradation to the water quality at the site. PCE was formerly detected in water samples <br /> collected from the City ofLodi domestic well number CW-3(now destroyed),located approximately <br /> 8'37 Sha ,, .Road, Stockton,California 9�M <br /> Tdcphonc(209)467-1006 Fax.(209)467-'1 1 18 <br />