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B-4 <br /> 4.2 Sample Identification and Cham-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 /> analysts has a label affixed to identify the fob number, sampler, date and time of sample collection, and <br /> a sample number unique to that sample <br /> This information, in addition to a descnption of the sample, field measurements made, sampling <br /> methodology, names of on-site personnel, and any other pertinent field observations, are recorded on the <br /> borehole log or in the field records Samples are analyzed by a California-certified laboratory <br /> A chain-of-custody form is used to record possession of the sample from time of collection to its arrival <br /> at the laboratory When the samples are shipped, the person in custody of them relinquishes the samples <br /> by signing the chain-of-custody form and noting the time The sample-control officer at the laboratory <br /> verifies sample integrity and confirm that it was collected in the proper container, preserved correctly, <br /> and that there is an 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 /> i <br /> LRPM 066 <br />