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• • Page 1 of 1 <br /> Vicki McCartney [EH] <br /> From: Andrew Dorn [AndrewD@gtienv.com] <br /> Sent: Thursday, June 20, 2013 11:21 AM <br /> To: Vicki McCartney [EH] <br /> Cc: Ray Kablanow; Jenny Weese <br /> Subject: George's Service- 1600 W. Durham Ferry Rd., Tracy <br /> Good morning Vicky, <br /> I am contacting you in regards to the George's Service site located at 1600 W. Durham Ferry Rd.southeast of <br /> Tracy. I would like to let you know that we will be installing the air sparge wells on Friday,June 21 starting at 7 <br /> am. <br /> AS-5 location <br /> Upon looking at pictures of the soil excavation, it appears the excavation sidewall parallel to the sites building <br /> came within 2 or 3 feet of the building foundation at a slope of about 45 degrees.The revised location of AS-5 <br /> will be as close to the building as the drill rig will allow(^'4-5 feet) and should initially begin in the excavation fill <br /> and enter the native soil below prior to 5 feet bgs.Soil samples will be collected from t�AS-5 borehole every <br /> five feet starting at 5 feet bgs. S G f eGn 2,2-. �4'"y S <br /> � 5cr 2` - <br /> Monthly performance monitoring 3 <br /> GZA is currently collecting DO and ORP readings from select ground ter monitoring well including down- <br /> gradient off-site well MW-106. We are currently having trouble get mg an access agree ent from the property <br /> owner and would like to begin monitoring down-gradient well MW-7 rather than MW-106. In addition,as shown <br /> in a cross section (Figure 4A) of the Geoprobe Site Investigation work plan dated September 18,2008, MW-7 is <br /> screened within the sand layer that extends down-gradient from beneath the site and is being treated by the AS <br /> system (20-25' bgs).As shown in Figure 4C of the same report, MW-106 is screened in a deeper sand layer(>30' <br /> bgs)that is not being treated by the air sparge system 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 or on <br /> my cell phone (559)410-3858. <br /> Thank you, <br /> Andrew Dorn <br /> Ground Zero Analysis, Inc. <br /> 4P 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 /> 6/20/2013 <br />