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• • Page 4 of 8 <br /> of the communications.Any review or distribution by others is strictly prohibited.If you are not the intended <br /> recipient please contact the sender by return electronic mail and delete all copies of this communication <br /> From: Andrew Dorn v <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 /> Hello Vicki, <br /> Here is the additional information you requested for the Additional Air Sparge Well <br /> Installation Work Plan: <br /> Well Installation <br /> The air sparge (AS) well boreholes will be drilled by a licensed driller, using an 8- <br /> inch outside diameter, continuous flight, hollow stem auger to a depth of 25 feet <br /> below grade. The AS wells will be constructed similar to air sparge wells AS-1, AS- <br /> 2 and AS-3, using 1.0 inch diameter PVC casing with flush threads. The sparge point <br /> will consist of a 5-foot long fine screened interval designed to produce fine bubbles <br /> with maximum surface area. A #12 sand filter pack will surround and extend 1 foot <br /> above and below the sparge point. A three-foot transition seal will be installed above <br /> the sand pack by adding weighted bentonite pellets. A surface seal will be achieved <br /> by pumping a neat cement grout (augmented with <4% bentonite) via a tremie tube. <br /> The tops of the wells will be provided with an injection wellhead. <br /> Soil Samoling <br /> Select soil samples will be collected in 6.0-inch brass liners using a 2.0-inch modified <br /> California split spoon sampler. All soil samples will be sealed with Teflon, capped <br /> with plastic end caps, labeled and placed in a cooler at 4° Celsius for transport to a <br /> California certified laboratory under Chain of Custody procedures. Since all three (3) <br /> wells will be installed within the excavation backfill, soil samples will be collected <br /> for laboratory analysis and lithology at depths beneath the bottom of the excavation. <br /> These soil samples will be analyzed for TPH-g & BTEX constituents by EPA method <br /> 8260B. <br /> I have attached the laboratory results from the January 2013 and May 2013 <br /> groundwater sampling 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 /> Geological Technics <br /> 1172 Kansas Ave <br /> 5/28/2013 <br />