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' noting the time. The sample-control officer at the laboratory verified sample integrity and confirm that it was collected .in the proper container, preserved correctly, and there is an . adequate volume for analysis. ' If these conditions were met, the sample was assigned a unique log number for identification throughout analysis and reporting. The log number was recorded on the chain-of-custody form and in the legally-required log book maintained by the laboratory in the laboratory. The sample description, date received, client ' s name, and any other relevant information was also recorded. ' 1.7 .3 Analytical Quality Assurance In addition to routine calibration of the analytical instruments with standards and blanks, the analyst is required to run duplicates and spikes on 10 percent of the analyses to insure an added measure of precision and accuracy. Accuracy is also verified through the following: 1. U.S. Environmental Protection Agency (EPA) and State certification programs. i2 . Participation on an interlaboratory or "round-robin" quality assurance program. ' 3 . Verification of results with an alternative method. For example, calcium may be determined by atomic absorption, ion chromatography, or titrimetric methods. Volatile organics may be determined through either purge and trap or liquid-liquid extraction methods. 1.7 .4 Miscellaneous Checks of Accurac Where trace analysis is involved, purity of the solvents, reagents and gases employed is of great concern. The laboratory maintains a service contract on all mayor instrumentation; gas chromatograph, atomic absorption, ion chromatography, and total organic carbon analyzers are all serviced and maintained ' regularly. The above program is more than sufficient for most needs. Additional quality assurance such as spikes and duplicates on all analyses, will be provided of requested. 1