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10121/2003 17: 32 20983251 WRIGHT ENVIRONMENTAL PAGE 02 I <br /> Wright <br /> Unviroonlental <br /> Services,lnc. <br /> colislrkclipn Engineering f Rernediation <br /> I <br /> October 21,2003 <br /> Projea No. 4233-3 <br />` Mr, Jeffrey Wong <br /> Senior FXHS <br /> Environmcntal Health Deptutment <br /> San Joaquin County <br /> 304 East Weber Avenue <br /> Stockton,California 95202.. <br /> i Rv Workpiart A.ddevdwm for Ozone lne�tinn <br /> Stdanos GaWine 141.9 Cbserter Wily,'Stoekten CA. <br /> Dear Mr. Wong, <br /> one injection has been proposed as an interim remediation measure to clean up <br /> ozone <br /> petroleum hydrocasci n impacted ground water at*6 subject site(Figure 1-•Ozom <br /> XajoCtipn Well Locations). This addendum is submitted st the directiOu Of the San <br /> Joaquin Public Health Servioes Environment*Hearth Division(,PHS EKD), This <br /> addendum describes the installation Of Additionial ozono injection wells and modifies the <br /> original workplan. <br /> Ground water monitoing data(12aso St 2003,Wright 2003) show that the known Wen. <br />` of the groundwater plume is,centered on well MW-2 (Figure 2-Site Map).The highest <br /> ooncen,tratioas of ebgraicalt of cancern(COCl)irt0ludini TPH-G,BTEX, 1,2 ACA and <br /> fuel Oxygenates occur at depths of 40 to 50 feet in arise grotuid water,although CDC s <br /> have boon detected in dis rete .pmertrotineaketr Wmpiee saloon at depths of up to 115 <br /> Gage 2003). <br /> 1 . <br /> I� The iDtapre:td,6r,Of siteL_strWgraphy and hydrogeology is underway based on the recce€ <br /> Cone pemmmet testing and VDursl water'"lung condudcd at the site but has yet tl <br /> be firtaliated- The foilawitsg discussion is basad on, Draft cow sections A A and B-B <br /> (coached)developed by Wright frost the CPT dare;and,I'bo'a legs!;t'oA the site <br /> inveesigsoRt oandtsked by Ramage Envirortra<tertta] in 1999(att�ched)- A gli ear <br /> I schemoic of tho sshaotigrapbY is supwismpoaed 60 the omr><e Ynjj. ewtian well dcaail(Figure <br /> 2). <br /> Situ investiPtion Bind ground water m nhoriv4 reports#lar this site tend to repot 0260 <br /> growld wsttear leve9 at 40 feet. 146WOM.�esrsatia wt#h the iitYe4atigsttut8 8 <br /> 67,E. 10tb Street . Tracy,CA 95376 <br /> 209.833.0758 • Fax 209.832.5152 <br /> w ighe inrzachxopi Lic.#1651501 A-13 ffazkfat, C21 <br /> websft http,//wrightertviraimentalservices.cam <br />