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certified to perform the specified tests by the State of California 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:IChevron%942751Period1c MonitoringlQ M RIFIELD AND LABORATORY PROCEDURE51.doc 2 of 2 <br />