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#:J+i+J' .,,,..�Ws�icwa�vs,'trnaowrxueo,:.,..... �en�w.+awa�r.7r.T.,.•.�=.:mTMsea'.:--�eae'� <br /> r <br /> i <br /> aliquots or subsamples are to be split out, care is taken <br /> to Ensure that the subsamples are representative of the <br /> original. Dlending or grindinn may be required. <br /> The sample control officer places the sample (or fractions <br /> if the sample requires subdivision) into designated storage <br /> areas. Most samples are stored under refrigeration at 4 <br /> j degrees C; refrigerators are marked with test categories <br /> for convenient retrieval of samples. Vola+.ile organic <br /> vials are segregated from other samples to prevent <br /> vapor-phase cross contamination. <br /> Chain-of-custody procedures have been established to <br /> document the identity of a sample and its handling from the <br /> time of collection until its ultimate disposal. The <br /> sampling technician in the field initiates a chain-of- <br /> custody record (Figure 2) which is provided with the <br /> bottles and remains with the sample throughout its <br /> harilling. This includes the transfer of samples from the <br /> field crew to the laboratory and, in some cases, to the <br /> subcontractor's laboratory. <br /> Upon receipt at the laboratory, sample integrity is <br /> verified by the sample control officer as described above. <br /> Each sample is then assigned a discrete log number which, <br /> in addition to being attached to the sample container, is <br /> entered on the custody record, in the legally required <br /> sample log book, and onto the computerized data handling <br /> ! system. Besides the log number, the computerized record <br /> also contains the client name, the sample description, the <br /> sample matrix type, the required analytical parameters, and <br /> the report due date. Supplementary information such as <br /> f special handling requirements may be entered as well. <br /> 11-2 <br />