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1. U.S . Environmental Protection Agency (EPA) and State <br /> certification programs. <br /> 2 . Participation on an interlaboratory or "round-robin" quality <br /> assurance program. <br /> 3 . Verification of results with an alternative method. For example, <br /> calcium may be determined by atomic absorption, ion <br /> chromatography, or titrimetric methods. Volatile organics may be <br /> determined through either purge and trap or liquid-liquid <br /> extraction methods. <br /> 1 . 5. 4 Miscellaneous Checks of Accuracy <br /> Where trace analysis is involved, purity of the solvents, reagents and <br /> gases employed is of great concern. The laboratory maintains a service <br /> contract on all major instrumentation; gas chromatograph, atomic <br /> absorption, ion chromatography, and total organic carbon analyzers are <br /> all serviced and maintained regularly.The above program is more than <br /> sufficient for most needs. Additional quality assurance such as spikes <br /> and duplicates on all analyses, will be provided if requested. <br />