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5 bottles will be filled directly from the discharge line of the bladder pump or from the bailer , and will be filled to the brim. A Teflon-lined cap (septa) will be placed on the bottles, and the volatile organic analysis (VOA) - bottles will be checked to determine that no air bubbles remain within. All water samples will be labeled and stored as described in the soil samples section above, and transported to the Eureka laboratory in Sacramento within 48 hours. Soil Boreholes Soil boreholes will be grouted with bentonite-cement slurry or neat cement from the bottom of the borehole to ground surface. Decontamination Procedures To prevent .cross-contamination, soil sampling equipment and all pumps, bailers, and their related tubing will be washed with laboratory-grade detergent, rinsed with tap water , and rinsed with deionized water before sampling and development. Downhole drilling equipment and the development pump will be steam-cleaned before and between use at each borehole. Quality Assurance Plan The procedures to be followed in sample collection, identifica- tion, and handling at the ARCO site are described below. The analytical quality assurance program is also discussed. Sample Collection and Handling Proper collection and handling are essential to ensure the quality of the sample. All samples will be collected by experienced field personnel. The samples will be collected in suitable containers which have been precleaned at the laboratory. The containers will be clearly marked and dated for identification. All samples will be cooled and stored for analysis no longer than the maximum allowable holding time . Sample Identification and Chain-of-Custody Procedures Sample identification and chain-of-custody procedures ensure sample integrity and document sample possession from the time of collection to its ultimate disposal. Each sample container submitted for analysis will have a label affixed to identify the job number , sampler, date and time of sample collection, and a sample number unique to that sample. This information, in addition to a descrip- tion of the sample , field measurements made , sampling methodology, names of onsite personnel, and any other pertinent field observa- tions, will be recorded on the boring log or in the field records.