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A-3 <br /> the samples by signing the chain-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 /> analysis 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 Anal tical Quality Assurance <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 <br /> 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 /> 1 <br /> I <br /> RPT049.TA <br />