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Sr U <br /> 1 <br /> SITE CONCEPTUAL MODEL <br /> Former Shell Service Station <br /> 1267 Country Club Boulevard, Stockton, California <br /> 6 Additions! Recommended <br /> �.. Data or Tasks <br /> 6.1 Additional investigation Assess groundwater quality in the 41 to 46 fbg sand lens and at <br /> depths below 60 fbg. A <br /> 6.2 Site Conceptual Model SCM Update existing SCM with cross-sections. <br /> 6.3 Revised quarterly monitoring Sample wells S-1 through S-4 quarterly and wells S-5 and S-6 <br /> program annually. Analyze samples from all wells for TPHd, TPHg, BTEX, <br /> and 1,2-DCA. Analyze samples from well S-3 for naphthalene, <br /> PCBs, and creosote for two quarters. <br /> Attachments: <br /> 1 -Historical Soil Sampling Results and Locations <br /> 2-Historical Groundwater Sampling Results <br /> 3-Available Soil Boring Logs <br /> 4-List of Known Environmental Documents <br /> i <br /> cy <br /> I <br /> I <br /> I <br /> 5 <br /> } <br /> I <br /> 1 <br /> 0943 Page 3 of 3 Date Modified: 11/19/02 <br /> i <br />