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with water, isopropanc?, and deionized water. Decontamination wastewater will be <br /> contained and disposed of as described in Section 3.5.2. Equipment will be air-dried. <br /> — 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 Lk cuntent possessions are the <br /> following: <br /> • Chain-of-Custody Records <br /> • Air bills or shipping records (e.g., Federal Express and Greyhound Bus- <br /> lines) 3 <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 he used to identify each sample and associated dupli- <br /> cates for chemical analysis. This system will provide a tracking number to allow retriev- <br /> al and crass-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 /> 4.4.1 CHAIN-OF-CUSTOIDY <br /> To document sample possession, chain-of-custody procedures are followed. A sample <br /> F' is under custody if one or more of the following criteria are met: <br /> LjA <br /> • 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 tamper- <br /> ing. <br /> It is in a designated secured area. <br /> s . SF03160AWPW431 4-8 <br /> - i <br /> s <br />