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A-3 II <br /> the samples by signing the cham-of-custody form and noting the time of shipment The sample-control <br /> officer will verify and confirm that it was collected in the proper container, preserved correctly, and that <br />' there is an adequate volume for analysis <br /> If these conditions are met, the sample will be assigned a unique log number for identification throughout <br /> tanalysis and reporting The log number will be recorded on the chain-of-custody form and in the <br /> legally-required log book maintained by the laboratory The sample description, date received, client's <br />' name, and other relevant information will also be recorded <br />' 2.3 Analytical Quality Assurance <br /> i <br /> In addition to routine calibration of the analytical instruments with standards and blanks, the analyst is <br />' required to run duplicates and spikes on 10 percent of the analyses to insure an added measure of <br /> precision and accuracy Accuracy is also verified through the following <br /> 1 EPA and state certification programs <br /> 2 Participation in an interlaboratory or "round-robin" quality assurance program <br /> 3 Verification of results with an alternative method Volatile organics may be determined <br />' through either purge and trap or liquid-liquid extraction methods <br /> 5 <br /> 1 <br /> 1 <br /> ' RPTOM TA <br />