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A4OM Chain-of-custody procedures include the procedures for documenting the identity of samples at the time they are collected in the field, documenting physical possession of sample containers, and verifying the integrity of sample shipments. See Chain-of-Custody (COC) SOP100 for additional details. 5.4 Sample Label Sample labels are documents used to identify the sample and sampling information. Labels remain with the sample from the time it is collected. Sample labels are usually provided by the analytical laboratory. Sample labels have an adhesive backing that allows them to be attached directly onto each sample container. All sample containers must have an attached sample label and all information on the sample label must be complete. Sample labels can be attached directly onto their respective sample collection containers immediately before or after a sampleis collected and will remain attached to the sample container through sample analysis. After attaching the sample label onto the sample container, place clear tape over the sample label to protect the label from damage due to moisture and blemishes that can make the sample label difficult to read. 5.5 Custody Seal A custody seal is a narrow strip of paper with adhesive backing that is placed across each sample container lid and body after the container is properly packed with samples and is ready for shipment to the analytical laboratory. The person preparing the sample container forshipment to the laboratory is responsible for signing and dating the custody seal and placing it onto the sample container. The custody seal is placed across the container lid and body so thatthe seal must be broken if the packaging is opened. The purpose of the custody seal is to provide a means to verify sample integrity from the time it is prepared for shipment in the field until the shipment is opened by the receiving analytical laboratory. n--- 0 -r