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B-4 <br /> 3 2 Sample Identification and Chain-of-Custody Procedures <br /> Sample identification and chain-of-custody procedures ensure sample integrity and document sample <br /> possession from the time of collection to its ultimate disposal. Each sample container submitted for <br /> analysis has a label affixed to identify the job number, sampler, date and time of sample collection, and a <br /> sample number unique to that sample. This information, in addition to a description of the sample, field <br /> measurements made, sampling methodology, names of on-site personnel, and any other pertinent field <br /> observations is recorded on the borehole log or in the field records. Samples are analyzed by a <br /> California-certified laboratory. <br /> A chain-of-custody form is used to record possession of the sample from time of collection to its arrival at <br /> the laboratory. When the samples are shipped, the person in custody of them relinquishes the samples by <br /> signing the chain-of-custody form and noting the time. The sample-control officer at the laboratory verifies <br /> sample integrity and confirms it is collected in the proper container,preserved correctly, and that there is an <br /> adequate volume for analysis. <br /> If these conditions are met, the sample is assigned a unique log number for identification throughout <br /> analysis and reporting. The log number is recorded on the chain-of-custody form and in the <br /> legally-required log book maintained by the laboratory in the laboratory. The sample description, date <br /> received, client's name, and other relevant information is also recorded. <br /> LRP015.809 <br />