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Vapor Intrusion Assessment Work Plan Project number:60653972 sample labels and chain-of-custody forms related to the samples until the samples are transferred or dispatched properly. During an investigation,custody is maintained if an environmental sample is: • In one's actual physical possession or view • In one's physical possession, and has not been tampered with(i.e.,under lock or official seal) • Retained in a secure area with restricted access or • Placed in a container and secured with an official seal so that the sample cannot be accessed without breaking the seal A chain-of-custody form will be used as the sample custody and analyses specification document for samples from the time of collection to laboratory analysis. 5.5.1 Transfer of Custody and Shipment Samples must always be accompanied by chain-of-custody paperwork.When transferring the possession of samples,the individual(s)relinquishing and receiving will sign, date,and note the time in the appropriate space on the custody paperwork.If the transfer occurs among the sampling team,the individual receiving the samples must document the range of sample numbers transferred to their possession in the"Received By"field. This act documents the physical transfer of the sample or group of samples from the sampler to other field personnel.When shipping samples via overnight courier,the individual in possession of the samples relinquishes the samples by signing, dating, and noting the time and completing the"Received By"box with the courier's name and air bill number. All shipments will be accompanied by the appropriate custody and analyses specification document(s) identifying the shipment container's contents and analyses needed for each sample.The original chain-of- custody form will be stored with the project files; copies of the document will be sealed in a plastic bag and placed in the ice chest along with the samples. If sent by common carrier or air freight,the air bill will be maintained. The method of shipment, courier name(s), and other pertinent information will be entered on the chain-of-custody form. The following information will be conveyed to the scheduled laboratory when samples are shipped: • Date shipped • Number of samples by concentration (high,medium, low), if known, and sample matrix • Carrier and air bill number Field personnel will notify the laboratory representative of Saturday sample deliveries, if necessary. 5.6 Data Quality Management 5.6.1 Data Handling Systems The following subsections describe the process for handling data in terms of data generation,review, and routing for field sampling data. The procedures identified in previous subsections describe the recording of measurements onto data collection forms.This subsection discusses the monitoring and controls established to track field data through the field form completion,review, and correction. 5.6.2 Field Form Completion Data collection procedures and field documentation will be recorded on field forms. Examples of the field forms are provided in Appendix A. Prepared for: California Regional Water Quality Control Board,Central Valley Region AECOM