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I 4.4.2 Sample Labels Sample labels are necessary to prevent misidentification of samples. The labels will contain the following information: • Sample identification number • Date and time of collection • Sample type • Analyses to be performed • Sampling personnel Labels will be affixed to all sample containers at the time of sampling. 4.5 Documentation and Chain-of-Custody A required part of any sampling and analytical program is the integrity of the sample from collection to data reporting. This includes the ability to trace the possession and handling of samples from the time of collection,through analysis,and final disposition. This documentation of the sample's history is referred to as"chain of custody." The components of the chain of custody(custody seals,a field log book,chain- of-custody record) and the procedures for their use are described in the following paragraphs. A sample is considered to be under a person's custody if it is: • In a person's physical possession • In view of the person after the person has taken possession,or • Secured by that person so that no one can tamper with the sample A person who has samples under custody must comply with the procedures described in the following sections. 'i 4.5.1 Chain-of-Custody Record To establish the documentation necessary to trace sample possession from the time of collection,a chain- of-custody record will be filled out and accompany every sample. The record will contain the following minimum information: • Station location (tied to a sampling location) • Signature of collector(s) • Date and time of collection • Sample identification number • Number of containers • Project name and number • Name of shipper(remarks) • Date shipped (remarks) • Signature of people involved in the chain of possession • Inclusive dates and times of possession I • Air Bill Number f CATEMP1WORKPLnw_DCA_1.00C 11 i