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4.4 SAMPLE CUSTODY <br /> Chain-of-custody procedures are used to maintain and document sample possession. <br /> The principal documents used to identify samples and to document possessions are the <br /> following: <br /> Chain-of-Custody Records <br /> a Air bills or shipping records (e.g., Federal 7Qxpress and Greyhound <br /> Busiines) <br /> Field notebooks <br /> Photographs of the investigation <br /> The remedial investigation coordinator will maintain a supply of field documents includ- <br /> ing sample custody seals and Chain-of-Custody Records. <br /> A sample numbering system will be used to identify <br /> tch sample <br /> a plumber associated <br /> socito to du.pv- <br /> cates for chemical analysis. This system will provide a g <br /> al and cross-referencing of sample information, and provide anonymity for the samples <br /> at the laboratory. A listing of the sample identification numbers will be maintained in <br /> the field notebook. <br /> 4.4.1E CHAIN-OF-CUSTODY <br /> To document sample possession, chain-of-custody procedures are followed. A sample <br /> is under custody if one or more of the following criteria are met: <br /> ta it is in the sampler's possession. <br /> It is in the sampler's view, after being in his possession. <br /> it is in the sampler's possession and is then locked up to prevent <br /> tampering. <br /> It is in a designated secured area. <br /> 4.4.1.1 Sample Labels <br /> All samples will be labeled with information identifying the sample location, date and <br /> -- time of sample collection, sampler, and other relevant data, as appropriate. <br /> p ,o riate. All sam- <br /> ples will be assigned a unique identifying number that will be written on the sample <br /> label and affixed as a separate printed label. <br /> «. <br /> 4-$ <br /> SF0316051WPtOO4S1 <br /> •aa <br />