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A-4 Water Sample Collection for Volatile Oranic Analyses For volatile organic analyses(VOA),the water sample is decanted into each VOA vial in such a manner that there is no meniscus at the top of the vial. A cap is quickly secured to the top of the vial. The vial is inverted and gently tapped to see if air bubbles are present. If none are present,the vial is labeled and refrigerated according to soil and water sample labeling and preservation. Soil and Water Sample Labeling and Preservation Label information includes a unique sample';identification number,job identification number, date, and time. After labelingall soil and water samples are placed in a Ziploc® type bag and placed in a ice chest cooled to approximately 4° Celsius. Upon arriving at Delta's office the samples are transferred to a locked refrigerator cooled to approximately 4° Celsius. Chemical preservation is controlled by the required analysis and is noted on the chain-of-custody form. Upon recovery, the sample container is sealed to minimize the potential of volatilization and cross-contamination prior to.chemical analysis. Soil sampling tubes are typically closed at each end with a Teflon®sheet and plastic caps. The sample is then placed in a Ziploc®type bag and sealed.The sample is labeled and refrigerated at approximately 4° Celsius for delivery, under strict chain-of-custody,to the analytical laboratory. Sample Identification and Chain-of-Custody Procedures Sample identification and chain-of-custody procedures document sample possession from the time of collection to ultimate disposal. Each sample container submitted for analysis has 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 description of the sample, field measurements made, sampling methodology, names of on-site personnel,.and any other pertinent field observations, is recorded on the borehole log or in the field records. The samples are analyzed by a California-certified laboratory. A chain-of-custody form is 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 relinquishes the samples by signing the chain-of:custody form and noting the time. The sample-control officer at the laboratory verifies sample integrity and confirms that the samples are collected in the proper containers, preserved correctly,and contain adequate volumes for analysis. CL006.KS