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i <br /> . butyl ether (EtBE), tertiary-butyl alcohol (TBA), ethanol, 1,2-dichloroethane (1,2-DCA), and <br /> 1,2-dibromoethane (EDB) by EPA Method 82608. <br /> Labels documenting sample number, well identification, collection date and time, type of <br /> sample and type of preservative (if applicable) are affixed to each sample. The samples <br /> are then placed into an ice-filled cooler for delivery under chain-of-custody to a laboratory <br /> certified to perform the specified tests by the State of Califomia Department of Health <br /> Services Environmental Laboratory Accreditation Program. <br /> Trip Blanks <br /> To assure the quality of the collected samples and to evaluate the potential for cross <br /> contamination during transport to the laboratory, a distilled-water trip blank accompanies <br /> the samples in the cooler. The trip blank is analyzed for the presence of volatile organic <br /> compounds of concern. For petroleum hydrocarbons, the trip blank is typically analyzed <br /> for TPHg, BTEX, and MtBE by EPA Method 8260. <br /> Containment and Disposal of Generated Purge Water <br /> All purge water generated during the field activities is temporarily stored within a <br /> polyethylene tank mounted on the sampler's truck. Purge water is stored in 55-gallon <br /> drums at the Chevron site. Water is then transported by Integrated Waste Management <br /> (IWM)for disposal at an appropriate facility. <br /> I <br /> I:1Chevron1942751Periodic Monitoring\Q M RWIELD AND LABORATORY PROCEDURES7.doc 2 of <br />