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06/27/2003 09:47 2098325' WRIGHT ENVIRONMENT"-1PAGE 82 <br /> Wrigbt <br /> Environmental <br /> q ;np <br /> va Services,Inc. <br /> construction + &&eering + Remediation <br /> June 26,2003 <br /> Project No. 4233-3 <br /> Trust of Mary Gardena <br /> 525 T'Street <br /> Santa Cruz, Caornia 95060 <br /> ,Atte.: Ms. Winifred..Alexander <br /> Re: Monitoring Well Installation, Sampling and AssmWent <br /> Addendum to Workplan Dated April 25,2003 <br /> Stefano's Gasoline 1419 Charter Way,Stockton,CA <br /> Dear Ms. Alexander, <br /> Wright Environwntal Services, Inc. (Wright) las prepared this addendum woriiplan on behalf of <br /> Estate of Joe Gardella (owner) for the above referenced site. The proposed work is in res:pouse <br /> to a letter dated January 27, 2003 frons the San Joaquin Public Health Services Environriiental <br /> Health Division(PHS EHD) for additional monitoring well.installations and site assessment.; This <br /> work is being done to address petroleum contaminants oto-site. Pmvious site assess activities <br /> have mapped portions of the dissolved plume and quarterly monitoring samplings with repo,is are <br /> ongoing at the site. The addendum was discussed in the meeting between Wright mA PHS..EHD <br /> repmseotatives on May 22,2003 and their letter dated June 2,2003, <br /> Meeti ng%f May 22,2003 and Discussion of Workplan <br /> Wright and PHS EHD representatives discussed the April 25, 2003 workplan and tate pruvious <br /> site work to date. The tanks were installed on the property in 1971 and the leak appears to I:enter <br /> on the former tank pit. Groundwater levels in the area way have been up to 30 &-iA deeper'than <br /> present day, a condition that would have enhanced vertical contaminant penetration in year.;prior <br /> to the more recent groundwater`rebound" and water levels rising in the area. PHS EHD i:M in <br /> general ag�rnent with the wo�rkphm but iDd"rcated concerns regarding the nature of tba site <br /> swzatigraphy and contaminant pathways for all contaminants, especially 1, 2-Dirhlorethane 'i-1, 2- <br /> DCA). Comer*, tbree water bearing zones of interest occur at about 35-50 fejt, 60-65 fbA and <br /> 110-119 feet have been identified. The largest wea of petroleum,contaminant appears wittbin the <br /> 35-50 foot aquifer zone (roughly the area of MW-2), with scattered occurrences laterally m the <br /> deeper zones. <br /> 67E. 10th Street • Tracy,C.A.95376 Fagc l of 6 <br /> 209.$33.0758 . Fax 209.832.5I52 <br /> wright@iu inreach.com tic.#01501 A-B HazMat, C21 <br /> �' weNit http://wrightenvimnmentafservices.com <br />