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possession will be kept to a minimum. Original chain-of-custody rec- <br /> ords will be returned to EMCON by the subcontracted laboratories. <br /> laboratory na ysis Reauaa Sheet <br /> An analysis request sheet or purchase order will accompany the samples <br /> delivered to each laboratory. These forms will serve as official com- <br /> munication to the laboratory of the particular analysis(es) required <br /> for each sample and provide evidence that the chain-of-custody was <br /> complete. An example of an analysis request sheet is shown on Fig- <br /> ure A-3. <br /> PJ9 9390207.00D -12 <br />