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loss of contaminants due to volatilization. Sample containers were labeled with the location, <br /> date, time, sampler name, analyses to be performed, and preservatives added to the sample <br /> containers. <br /> After labeling, the samples were placed in an ice chest chilled to at least 37°F for delivery to a <br /> California-certified laboratory under standard chain-of-custody procedures. All groundwater <br /> samples were analyzed by EPA method 8260B. <br /> 2.2 Quality Control/Quality Assurance <br /> As part of the quality assurance program for this project trip blanks for the sample sets are <br /> regularly utilized; trip blanks are provided by the laboratory. A trip blank was prepared and <br /> labeled by the analytical laboratory and transported to the site along with the empty groundwater <br /> sampling containers. For the May 2008 sampling event a blank was labled "dupe" groundwater <br /> sample. The sample was labeled with the same information as the other groundwater samples. <br /> The trip blank remained unopened and was transported back to the laboratory with the other <br /> groundwater samples. The laboratory adheres to its own quality control and quality assurance <br /> procedures for sample handling, analyses, equipment operation, and data reporting. <br /> During groundwater sampling, the electronic submersible pump and electronic water level <br /> indicator were thoroughly decontaminated prior to each use using a three-bucket wash. The <br /> three-bucket wash consists of scrubbing the equipment in a tap water and phosphate-free <br /> detergent mix; rinsing with tap water; and a final rinse with deionized water followed by air <br /> drying. Because single-use polyethylene (poly) tubing, disposable poly bailers, and laboratory- <br /> provided sample containers are used,there is no need to decontaminate this equipment. <br /> Purge water generated during the sampling event is temporarily stored on-site in a polyethylene <br /> holding tank. The tank is properly labeled as Non-hazardous Material. The purge water will be <br /> periodically re-injected into the GZVI formation. <br /> 7 <br />