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SAMPLE HANDLING The possession and handling of all samples collected will be traceable from the time of collection, through analysis, until final disposition. Documentation of the sample history is referred to as "chain-of-custody." Components of the chain-of-custody [sample seals, chain- of-custody record, and field documentation (Solid Substance or Liquid Substance Sampling Forms)] and procedures for their use are described in the following section. A sample is considered to be under a person's custody if it is: 1) in a person's physical possession, 2) in view of the person after he or she has taken possession, 3) secured by the person so that no one can tamper with the sample, or 4) in a secure azea. A person who has samples under custody must comply with the procedures described in the following sections. Chain-of Custody Records To establish the documentation necessary to trace sample possession from the time of collection, achain-of-custody record must be filled out in triplicate and must accompany every sample or group of individually identified samples. Chain-of-custody records will contain the following information: • Sample Identification Number • Date and Time of Sample Collection • Signature or Initials of Sample Collector • Matrix Type • Number of Containers • Signatures of People in the Chain-of-Custody • Date and Time of Each Change of Custody • Method of Shipment • Condition of Samples When Received by Laboratory Each person who has custody must sign the form. Samples cannot be left unattended unless they are secured and sealed. Sample Labels Sample labels aze necessary to prevent misidentification of samples. Gummed paper labels or tags supplied by the laboratory will be used and will include at least the following information: Sample identification number (referenced to a sampling location) Signature or initials of sample collector Date and time of sample collection