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5.. taken 5 minutes apart. When pH and electricalconductivity have been determined to have stabilized, water samples will be collected and, submitted to the laboratory to be analyzed for BTX (EPA 602) , total 1 petroleum fuel hydrocarbons (EPA 8015) , and total lead. Results will; I be made available to ARCO within' 48 hours. Sample 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 -ibottles, and the volatile organic analysis (VOA) bottles will be checked to idetermine that no air bubbles remain within. f � All water samples will be labeled and stored as described in the soil samples section above, and transported to the SC laboratory in Emeryville within 48 hours. 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 de--ionized water before sampling and development. Downhole drilling equipment and the development pump will be siteam-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. i 6 Sample Collection and Handling Proper coilection and handling are -essential to •ensure the i 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 i maximum allowable holding time. I 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 I' 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 on-site personnel, and any other pertinent field observa- tions, will be recorded on the- boring log or in the field-records.