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Wright <br /> Environrne�ta��� 0 :� E � ,' <br /> Services, Inc. i' 0,YJ Q -'?.VI E <br /> ��g} �+ y� <br /> Constructiai • Engineering ♦ Remech�t X CT 23 <br /> October 21,2003 <br /> Project No, 4233.3 <br /> Mr. Jeffrey Wong <br /> Senior REHS <br /> 'Environmental Health Department <br /> San Joaquin County <br /> 304 East Weber Avenue <br /> Stockton,'California 95202 <br /> Re: Workplan Addendum for Ozone lnjecticm <br /> Stefano" Gawline 1419-Charter Way, Stockton,CA <br /> Dear Mr. Wong $ <br /> Ozone injection has been proposed as an interim remediation measure to clean up <br /> petroleum hydrocarbon impacted ground water at the subject site ff igure 1.Ozone <br /> .Injection Well Locations). This addendum is submitted_at the direction of the San <br /> Joaquin Public Health Services Environrnentai Health Division(PHS EHD). This <br /> addendum describes the installation of additional ozone injection-wells and modifies the <br /> original workplan, <br /> Ground water monitoring data(Ramage 2003,Wright 2403b) ahoy that the known extent <br /> of the ground'water plume is centered on well MW-2 (Figure 2 Site Map). The highest <br /> concentrations of chemicals of concerns(COCl)including TPH-G,BTEX, 1,2 DCA and <br /> fuel oxygenates occur�at depths of 40 to 50 feet in site ground water,ahhough COCa <br /> have been detected in discrete cone penetrometer samples taken at depths of up to 11.5 <br /> feet(Ramage 2003). <br /> Site S 'UJn v MM*Well DNI&U <br /> based on the recast <br /> The interpretation of site stm igraphy and,hydrogeology is,underway <br /> Cone Penetrometer testing and ground water sampling oonduated at the site but has yet to <br /> be finalized. The foHowing discussion is based on: Draft cross sections A A'and B-B' <br /> (attached) developed by Wright from the CPT data;and,boor lags from the site <br /> investigation conducted by Ramage Environmental in 1999(attached). A generalized <br /> schematic of the sbutigMhY is superimposed on the ozone injection-well detail(Figure <br /> 2). <br /> Site investigation.and ground water rnonitoriieg reports for this site tend-to report static <br /> growd water level at 40 feet. However,conversations with the investigating`geologists <br /> 6TE. 10th Street • Tracy,CA 95376 <br /> 209.833.0758 ♦ Fax 209.832.5152 <br /> wright@inreach.com Lk. #651507 A-B HazMat, C27 <br /> websit http://wrightenvironmentalservices.com <br />