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04/23/2003 15:41 209832511 �, WRIGHT ENVIRONMENT— PAGE 03 <br /> q i <br /> Wrigbt <br /> Environmental <br /> Const walon ♦ Engin eerrhg ♦ Remediation <br /> April 24, 2003 <br /> Project No. 4233-4 <br /> Trust of Mary Gardella <br /> P_O_ Box 958 <br /> Capitols, California 95010 <br /> Attn.: Ms. Winifred Alexander <br /> Re: Monitoring Well Installation, Sampling and Assess Went <br /> Stefano's Gasoline 1419 Charter Way, Stockton, CA <br /> Dear Ms. Alexander, Y <br /> Wright Environmental Services, Inc. (Wright) has prepared this warkplan on behalf of Evate of <br /> Joe Gardella responsible party for the above referenced site, The proposed work inion response to <br /> a letter dated January 27, 2003 from the San 'joaquin Public Health Services Environfnental <br /> Health Division(PHS EHD)for additional monitoring well installations and site assessment. This <br /> work is being done to further define the horizontal and vertical extent of petroleum comae inants <br /> released from Underground Storage Tank(s) ora;site. Previous site assessment activitie have <br /> mapped portions of the dissolved plume and quarterly monitoring sampling with repo Is are <br /> ongoing at the site. <br /> Backgmund for Scope of Work <br /> The technical approach to this project is to build upon the previous work. Ra=ge Environmental <br /> (Ramage) has previously. performed site investigation, well installation and quarterly monitoring <br /> for the site during 2000-2003 (see References). Seven groundwater-monitoring weds are <br /> currently used for this site. The monitoring well, data has been summarized in Rage r.."ports_ <br /> The site contaminants include Total Petroleum Hydrocarbons as Gasoline (TPHG) Benz6:ie (B), <br /> Toluene(T), Ethylbenzene (E), Xylene(X), Met*l tert-butyl-ether(MTBE), and Fuel oz g6nates <br /> tert-Amyl-Methyl-Ether (TAME), Ethyl-tert-Butyl-Ether (ETBE), Di-Isopropyl .Ether (DIFF) <br /> and tert-Butyl Alcohol(TBA) and 1,2�Dichlorethane(1,2-DCA). The monitoring data shoiv.s that <br /> dissolved contaminants are present in Well NlW.-3 and a thin layer of free phase produA, was <br /> observed in MW-2_ These existing monitoring wells are approximately 50 feet deep' <br /> 67 E. loth Street • Tracy,CA 95376 <br /> 209.833.0758 a Fax 209.832.5152 Nit 1 of 1 <br /> vwigh4ihre=h.cam d,{c,'#6.f1501 A-B Hazhint <br /> websit htlp,//honRe,inreach.tom/wriglrP <br />