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u <br /> i <br /> A chain-of-custody form was used to record pmession of the sample from time of collection to its arrival <br /> at the laboratory. When the samples are shipped,the person in custody of them relinquished the samples <br /> by signing the chain-of-custody torn and noting the time of shipment. 71e sample-control officer at the <br /> 11 - laboratory verify sample integrity and confirms that it was collected in the proper container, preserved <br /> t. correctly, and that there is an adequate volume for analysis. <br /> The sample was assigned a unique]og number for identificationthroughout analysis and reporting. The <br /> tog number was recorded on the chain-of-custody Corm and in :he legally-required log book maintained <br /> by the laboratory. 77te sample description,date received,client's name,and any other relevant information <br /> was recorded. <br /> 1.:: <br /> _�.� 3.3 Ana! cal uall Assurance <br /> + In addition to routine calibration of the analytigl instruments with standards and blanks, the analyst is <br /> C • required to run duplicates and spikes on 10 rant of the <br /> p Pe analyses to insure an added measure of <br /> precision and accuracy. Accuracy is also verified through the following: <br /> L U.S. Environniontal Protection Agency(FPA) and State certification programs, <br /> 2 Participation in an inter-laboratory or'round-robin'quality assurance program. <br /> 3. Verification of results with an alternative method. For example,calcium may be deter- <br /> mined by atomic absorption,ion chromatography,or titrimetric methods. Volatile organics <br /> may be determined through either purge and trap or liquid-liquid extraction methods. <br /> i <br /> 3.4 Miscellaneous Checks oP Accura <br /> Where trace analysis is involved, purity of the solvents,reagents,and gases employed is of great concern. <br /> The laboratory maintains a se.-vice contract on all major instrumentation; gas chromatographs, atomic <br /> absorption, ion chromatography, and total organic carbon analyzers are all serviced and maintained <br /> regularly. <br /> The above program is more than sulEcient for most needs. Additional quality assurance, such as spikes <br /> and duplicates on all analyses, will be provided if requested. <br /> r <br />