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<#*> ETIC <br /> May 24,2007 <br /> Mr. Paul Anderson <br /> QA Director/Project Manager <br /> PSC Environmental Services <br /> 210 West Sand Bank Road <br /> Columbia,Illinois 62236 <br /> Subject: Soil and Groundwater Investigation Work Plan Addendum <br /> Former Colombo/Toscana Bakery <br /> 1444 South Lincoln Street, Stockton,California 95206 <br /> RWQCB File#390825 <br /> Dear Mr. Anderson: <br /> At your request, ETIC Engineering, Inc. (ETIC) has prepared this Soil and Groundwater <br /> Investigation Work Plan Addendum for the former Colombo/Toscana Bakery (Colombo/Toscana) <br /> located at 1444 South Lincoln Street in Stockton, California (the Site) (Figure 1). In accordance <br /> with the March 1, 2007 Soil and Groundwater Investigation Work Plan, this work plan addendum <br /> has been prepared to summarize the site subsurface conditions and to describe the locations and <br /> details of proposed groundwater monitoring wells. The Central Valley Regional Water Quality <br /> Control Board(CVRWQCB)approved the work plan in their March 12,2007 letter(Appendix A). <br /> In accordance with the Soil and Groundwater Investigation Work Plan, 11 soil borings(C1 through <br /> C1 1) were drilled at the Site between April 30 and May 3, 2007. The locations of the borings are <br /> shown on Figure 2. <br /> Soil and grab groundwater samples were collected from borings C 1 through C 1 I and transported <br /> under chain-of-custody protocol to Kiff Analytical (Kiff), a state-certified laboratory, in Davis, <br /> California. Kiff analyzed the samples for total petroleum hydrocarbons as gasoline (TPH-g), <br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX), five fuel oxygenates [methyl tertiary <br /> butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl <br /> methyl ether(TAME) and tertiary butyl alcohol(TBA)], and fuel additives 1,2-dibromoethane(1,2- <br /> DBA) and 1,2-dichloroethane (1,2-DCA) by EPA Method 8260B. The analytical data are <br /> presented in Tables 1 and 2. <br /> Completed soil borings C1 through C11 were filled and sealed with a grout mixture consisting of <br /> neat cement in accordance with San Joaquin County Environmental Health Department (SJCEHD) <br /> 2285 Morello Avenue, Pleasant Hill, CA 94523 • Phone: 925.602.4710 • Fax: 925.602.4720 • License #624022 <br />