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Section No. 5.0 Revision No. 6 Date 6/1/88 Page 13 After checking the samples and the chain-of-custody form for consistency, the Sample Custodian assigns a unique, six digit, laboratory identification number (ID number) to each sample for tracking control purposes. Each I0 number begins with a number which indicates the year in which the sample was received by the laboratory. Samples received in 1986 are assigned an ID number which begins with the number 6. The samples are then logged into the computer-based laboratory tracking system, and the computer generates the tracking sheets and accession sheets for the samples. A sample tracking sheet is presented in the Attachment III, and a sample accession page is presented as Attachment IV. After completing the sample receipt activities described, the Sample Custodian places the samples into the appropriate laboratory refrigerator to maintain the preservation of the samples, and the custodian then entP:•s the sample $o numbers into the sample custody log for that particular refrigerator. If the Sample Custodian is unsure of the proper preservation procedure for the samples, the Section Chief, in charge of the analysis requested on the sample, is contacted for instructions. Any preservation involving the addition of 1. } chemical preservatives, such as hydrochloric acid, is completed by the appropriate chemist and is noted on the sample custody log at the time of the addition. The project folder, containing the laboratory project work request form (see Attachment V), the chain-of-cu-,tody form and the tracking sheets, is then given to the Section Chief in charge of the analysis requested. For sections which do not maintain their own sample refrigerator, the Section Chief, or his/her designate must request the sample(s) from the Sample Custodian when analysis is about to begin. The transfer of the samples to the chemist is then noted in the sample control book for the refrigerator. When the samples have been analyzed, the samples are returned to the Sample 'Custodian, who either returns them to the refrigerator pending further analysis, disposes of the sample after a holding period of two weeks, or returns the samples to the client. The disposition of the sample is noted in the sample custody log for the refrigerator. A sample page from the sample custody log is presented as Attachment VI. }i canat .r L