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a <br /> 08 May 2008 <br /> AGE-NC Project No. 98-0465 <br /> Page 6 of 6 <br /> When vacuum is applied to the chamber,a negative pressure is created around the Tedlar bag,which <br /> inflates, allowing the soil vapor sample to enter directly into the bag via the inlet port. When the <br /> sample is collected, the negative pressure in the chamber is reduced and the sample bag is sealed, <br /> labeled, log on a chain-of-custody form, and place into a dry cooler (room temperature). <br /> Subsequently,all ofthe collected soil vapor samples will be delivered to a CDPH-certified laboratory <br /> for analysis of the chemical constituents listed in Section 3.2. <br /> After collection of the sample, soil vapor from the polyethylene tubing will be monitored for the <br /> presence of volatile organics using a photo-ionization detector(PID)pre-calibrated to isobutylene. <br /> 4.3. EQUIPMENT DECONTAMINATION <br /> Prior to use,all sampling tools used for sample collection will be thoroughly rinsed with clean water <br /> after being washed with a solution of Alconox. All probing rods will be cleaned prior to <br /> advancement at each probe boring location. <br /> 4.4. BORING ABANDONMENT <br /> Following collection of soil vapor samples,each borehole will be filled to the ground surface with <br /> a cement grout.The grout mixture will consist of portland neat cement and not more than 6 gallons <br /> of water per 94-pound sack of cement.The grout will be deployed through a tremie pipe.If required, <br /> a grout inspection will be scheduled with San Joaquin County Environmental Health Department <br /> personnel. <br /> Advanced GeoEnvironmental,Inc. <br />