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A-Z <br /> Sample identification and chain-of custody procedures ensure sample integrity and document sample <br /> possession from the time of collection to its ultimate disposal Each sample container submitted for <br /> analysis had a label affixed to identify the fob number, sampler, date and time of sample collection, and <br /> a sample number unique to that sample <br /> A chain-of-custody form was used to record possession of the sample from time of collection to its arrival <br /> at the laboratory When the samples were shipped, the person in custody of them would relinquish the <br /> samples by signing the chain-of-custody form and noting the tune The sample-control officer at the <br /> laboratory will verify sample integrity and confirm that it was collected in the proper container, preserved <br /> correctly, and that there was an adequate volume for analysis <br /> If these conditions are met, the sample would be assigned a unique log number for identification <br /> throughout analysis and reporting The log number was recorded on the sham-of-custody form and in <br /> the legally-required log book maintained by the laboratory in the laboratory The sample description, <br /> date received, client's name; and any other relevant information was also recorded <br /> 3.3 Analytical Quality Assurance <br /> In addition to routine calibration of the analytical instruments with standard 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 was also verified through the following <br /> I EPA and state certification programs <br /> 2 Participation in an mterlaboratory of "round-robin" quality assurance program <br /> 3 Verification of results with an alternative method For example, calcium may be determined <br /> by atomic absorption, ion chromatography, or titrimetric methods Volatile organics may <br /> be determined through either purge and trap or liquid-liquid extraction methods <br /> 3.4 Miscellaneous Checks for Accuracy <br /> Where trace analysis is involved, purity of the solvents, reagents, and gases employed is a great concern <br /> The laboratory maintains a service contract on all mayor instrumentation gas chromatograph, atomic <br /> LRP027 TA <br />