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PRE-TANK REPLACEMENT Site Assessment Work Plan 4315 Waterloo Road Stockton, CA. Aegis Project No. 89-047 Page 12 4.3 Soil Sample Screening: Portable Photoionization Detector Method After soil sample jars have been brought to ambient temperature, the head space of the soil sample jars will be screened with a portable photoionization detector or organic vapor analyzer equipped with a 10.2 eV lamp calibrated to benzene for direct reading in ppm. The sample jar lid will be opened and the detector probe immediately placed within the head space of the jar. The highest observed reading will be recorded. 4.4 Analytical Procedures All soil samples submitted to the laboratory will be analyzed for BTEX, 1,2-dichlorobenzene, 1,3-dichlorobenzene, and 1,4-dichloro- benzene by EPA method 8020, TPH by EPA method 8015 (modified), total lead (TTLC) by EPA method 7421, inorganic lead (STLC) by EPA method 6010 and organo lead by ASTM d3237-79 (modified). 4.5 Quality Assurance Plan 4.5.1 General Sample Collection and Handling Procedures Proper collection and handling are essential to ensure the quality of a sample. Each sample will be collected in a suitable container, preserved correctly for the intended analyses, and stored prior to analysis for no longer than the maximum allowable holding tine. Details on the procedure for collection and handling of soil samples to be used on this project can be found in Section 4.1. 4.5.2 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, date, and time of sample collection, and a sample number unique to that sample. This information, in addition to a description of the sample, field mea- surements made, sampling methodology, names of on-site personnel, and any other pertinent field observations will be recorded on the bore- hole log in the field records. All samples will be analyzed by a State-certified laboratory. A chain-of-custody form will be used to record possession of the sample from time of collection to its arrival at the laboratory. When the samples are shipped, the person in custody of them will relinquish the samples by signing the chain-of-custody form and noting the time. The sample-control officer at the laboratory will verify sample integrity and confirm that it was collected in the proper container, preserved correctly, and there is an adequate volume for analysis.