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�. <br /> r� <br /> Ing <br /> ..w <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 are shipped,the person in custody of them relinquished the samples <br /> t by signing the chain-of-custody form and noting the time of shipment. The sample-control officer at tae <br /> laboratory verify sample integrity and confirms that it was collected in the proper container, preserved <br /> j correctly,and that there is an adequate volume for analysis, <br /> wa <br /> s > The sample was assigned a unique log number for identification throughout analysis and reporting. The <br /> Iog nfrmber was recorded an the chain-0f-custody form and in the legally-required log book maintained <br /> ' by the laboratory. The sample descJption,date received,client's name,and any other relevant information <br /> was recorded. <br /> h. <br /> r=' <br /> M AMI-iilllcal Ouallty AssutAM <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. Accaracy is also verified through the foNowing: <br /> 1. U.S. Envjaonmental Protection Agency (EPA)and State certification programs. <br /> 2 Participation in an inter-labomtory or"round-robin'duality assurance program. <br /> 3. Verification of results with an alternative method For example,calcium may be deter- <br /> mined by atomic absorption,ion chrcmatography,or tittimetric methods. Volatile organics <br /> maybe determi led through either purge and trap or liquid-liquid extraction methods. <br /> 3 <br /> t-A 3.4 Miscellaneous Checks of Accuura <br /> x G Where trcce analysis is involved,purity of the solvents,reagents,and gases employed is of great concern. <br /> The laboratory maintains a service contract on all major instrumentation; gas chromatographs, atomic <br /> ` j <br /> _tt absorption, ion chromatography, and total organic Arbon analyzers are all serviced and maintained i <br /> x regularly. <br /> t <br /> 71te above program is more than sufficient for most needs. Additional quality assurance,such as spikes r <br /> a <br /> and duplicates on all anaiyses,will be provided if requested. <br /> y. x. .. <br />