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Pagel of 5 <br /> Vicki McCartney [EH] <br /> From: Andrew Dorn [AndrewD@gtienv.com] <br /> Sent: Friday, May 17, 2013 3:37 PM <br /> To: Vicki McCartney [EH] <br /> Cc: Ray Kablanow; Jenny Weese <br /> Subject: RE: George' Service- 1600 Durham Ferry Road, Tracy <br /> Attachments: 425 do-orp.pdf; W1308594_WO_1308594_FinalReport.pdf; WO_1301603_FinalReport.pdf <br /> Hello Vicki, <br /> Here is the additional information you requested for the Additional Air Sparge Well Installation Work <br /> Plan: espy,✓µ; 51 � zS' 3o. _zS <br /> Well Installation <br /> The air sparge (AS)well boreholes wi1 be drilled y a licen driller, using an 8-inch outside diameter, <br /> continuous flight, hollow stem auge to a de th of 25 feet below grade. The AS wells will be <br /> constructed similar to air sparge wells S-1, A -2 and A -3, using l.b inch diameter PVC casing with <br /> flush threads. The sparge point will consist of a 5-foot long fine screened interval designed to produce Vi <br /> fine bubbles with maximum surface ar A #12 sand filter pack will surround and extend 1 foot abode 2wyC <br /> and below the sparge point. A three-Toot transition seal will be installed above the sand pack by adding <br /> weighted bentonite pellets. A surface seal will be achieved by pumping a neat cement grout (augmented <br /> with < 4% bentonite) via a tremie tube. The tops of the wells will be provided with an injection <br /> wellhead. <br /> Soil Sampling <br /> Select soil samples will be collected in 6.0-inch brass liners using a 2.0-inch modified California split ! X11 <br /> spoon sampler. All soil samples will be sealed with Teflon, capped with plastic end caps, labeled and <br /> placed in a cooler at 4° Celsius for transport to a California certified laboratory under Chain of Custody <br /> procedures. Since all three (3) wells will be installed within the excavation backfill, soil samples will be Ji �A <br /> collected for laboratory analysis and lithology at depths beneath the bottom of the excavation..These sfliy <br /> samples will be analyzed for TPH-g& BTEX constituents by EPA method 8260B. »]1 S C l <br /> I have attached the laboratory results from the January 2013 and May 2013 groundwater sampling <br /> events. In addition I attached Table 1 with the added units. <br /> Let me know if you have any further questions or concerns. <br /> Thank you, <br /> Andrew Dorn <br /> Ground Zero Analysis, Inc. <br /> 6 Geological Technics <br /> 1172 Kansas Ave <br /> Modesto,CA 95351 <br /> (209)522-4119 <br /> 5/20/2013 <br />