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tion programs. <br />Participation on an interlaboratory or "round-robin" quality as <br />surance program. <br />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 />3.4 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. <br />The above program is more than sufficient for most needs. Additional <br />quality assurance such as spikes and duplicates on all analyses, will <br />be provided if requested.