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C <br /> 5.2.3 !Analytical Quality Assurance I <br /> In addition to routinecalibration of the analytical instruments <br /> r with standards and blanks, the laboratories are required to run <br /> duplicates and spikes on 10 percent of the analyses to insure an <br /> added measure of precision and accuracy. Accuracy is also verified <br /> through the following: <br /> 1. U.S. Environmental Protection Agency (EPA) and State <br /> certification programs. <br /> 2. Participation in an interlaboratory or "round-robin" quality <br /> assurance program " <br /> r <br /> 3. Verification of results with an alternative. method. For <br /> example.] calcium may be determined by atomic absorption, ion i <br /> chromatography or ,titrimetric methods. Volatile organics may !i <br /> be determined through either purge-and-trap or liquid-liquid <br /> extraction'methods. <br /> 5.2.4 �Xiscellanercus Checks of Accuracy <br /> - where.,Itrace anilysis is involved, purity of the solvents, reagents <br /> and gases employed is of great concern. Laboratories maintain <br /> service contracts on all major instrumentation: gas chromatograpr, <br /> atomic absorption, ion chromatography and total organic carbon <br /> analyzers are ali serviced and maintained regularly. The above <br /> program is more than suffirisiit fez most needs. Additional quality <br /> assurance such as spikes and duplicates on all analyses, will be # <br /> provided if requested. <br /> I <br /> - - - _-___.:L <br />