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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 analysis <br /> has a label affixed to identify the job number, sampler, date and time of sample collection, and a sample <br /> 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, are 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 the <br /> laboratory. When the samples are shipped,the person in custody of them relinquish as the samples by signing <br /> the chain-of-custody form and noting the time. The sample-control officer at the laboratory verifies sample <br /> integrity and confirm that it was 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 analysis <br /> and reporting. The log number is recorded on the chain-of-custody form and in the legally-required log book <br /> maintained by the laboratory in the laboratory. The sample description,date received,client's name,and other <br /> relevant information is also be recorded. <br />