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-3- If hydrocarbon odors or signs of hydrocarbon are detected in a soil sample, selected soil samples will be analyzed for benzene, toluene, xylene (BTX) (U.S. Environmental Protection Agency (EPA) Method 8020) , total petroleum fuel hydrocarbons (modified EPA 8015) , and total lead. The samples will be delivered to BC' s State of California Department of Health Services certified laboratory in Emeryville or Eureka Laboratory in Sacramento, within 48 hours of collection. Decontamination Procedures To prevent cross-contamination, all soil sampling and related equipment will be washed with laboratory-grade detergent, rinsed with tap water , and rinsed with deionized water before sampling. Downhole drilling equipment 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 on-site personnel, and any other pertinent field observa- tions, will be recorded on the boring log or in the field records. A chain-of-custody card (Figure 2) will be used to record possession of the sample from time of collection to its arrival at the laboratory. The sample control officer at the laboratory will verify sample integrity and confirm that it was collected in the proper container , preserved correctly, and that there is an adequate