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for each individual sample; for example, if samples are split and sent <br />to multiple laboratories, a record sheet will accompany each sample. <br />The number of custodians in the chain of possession will be kept to a <br />minimum. Original chain -of -custody records will be returned to EMCON <br />by the subcontracted laboratories. <br />Laboratory Analysis Request Sheet <br />An analysis request sheet or purchase order will accompany the samples <br />delivered to each laboratory. These forms will serve as official <br />communication to the laboratory of the particular analysis(es) <br />required for each sample and provide evidence of the chain -of - <br />custody. A copy of the request sheet will be returned to EMCON. An <br />example of an analysis request sheet is shown on Plate B-3. <br />At a minimum, the request sheet will include the following informa- <br />tion: <br />• Specific analytical parameters <br />• Sample identification <br />• Date analyses are due <br />• Project number <br />MM <br />