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Custody Control and Physical Security of Samples," for guidance on protecting sample chain of <br /> custody. See Figure 4 for an example of a Chain of Custody Form. <br /> B.4.4. Sample Shipment <br /> The samples are shipped in compliance with DOT regulations. Samples are shipped in coolers <br /> with ice. The shipment must include a signed Chain of Custody Form. <br /> B.4.5. Sample Receipt <br /> Upon sample receipt,the contracted analytical laboratory is required to: <br /> • Sign, date, and note the time on the Chain of Custody Form, indicating sample receipt <br /> • Assign unique laboratory identification numbers to the samples <br /> • Contact the laboratory coordinator to resolve any discrepancies in documentation or <br /> samples received <br /> • Return a copy of the Chain of Custody Form, if applicable, to the laboratory coordinator <br /> • The laboratory shall notify the laboratory coordinator within 24 hours of discovery of lost, <br /> damaged, or destroyed samples <br /> • The laboratory shall provide a Sample Condition Upon Receipt report to the laboratory <br /> coordinator within 24 hours of receipt, as applicable <br /> It is the responsibility of the laboratory coordinator to ensure that the laboratory complies with <br /> these requirements. <br /> B.4.6. Analytical Reports <br /> The laboratory sends an analytical report to the laboratory coordinator at the completion of <br /> sample analysis. The laboratory coordinator then initiates data review and validation. <br /> B.4.7. Records <br /> Records generated during the sample submittal process are kept on file electronically by NS, <br /> ACZ, and Daub. They are identifiable by the Project ID assigned to them by ACZ. <br /> B.S. Suggested Practice for Decontamination and Freeze Protection of Field <br /> Equipment <br /> B.5.1. Introduction <br /> An important aspect of quality control is the decontamination of field sampling equipment. <br /> Improperly cleaned and prepared sampling equipment can lead to misinterpretation of <br /> environmental data due to interference caused by cross-contamination. <br /> In addition, sampling equipment left in-situ for purposes of obtaining multiple samples over a <br /> period of time (e.g., periodic sampling for permit compliance) will often need to be cleared of <br /> Daub &Associates, Inc. Page B-10 Natural Soda LLC 2022 SAP <br />