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• Page 2 of 2 <br /> In addition,as shown in a cross section (Figure 4A)of the Geoprobe Site Investigation work plan dated <br /> September 18, 2008, MW-7 is screened within the sand layer that extends down-gradient from beneath <br /> the site and is being treated by the AS system (20-25' bgs).As shown in Figure 4C of the same report, <br /> MW-106 is screened in a deeper sand layer(>30' bgs)that is not being treated by the air sparge system <br /> and therefore is not providing useful data. <br /> Please let me know if you have any questions or concerns. I can be reached in the office at(209)522-4119 <br /> or on my cell phone(559)410-3858. <br /> Thank you, <br /> Andrew Dorn <br /> Ground Zero Analysis, Inc. <br /> 6 Geological Technics <br /> 1172 Kansas Ave,Suite A <br /> Modesto, CA 95351 <br /> (209)522-4119 <br /> andrewd@gtienv.com <br /> gti@gtienv.com <br /> 6/21/2013 <br />