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The NYWSC has a laboratory for analysis of soils and water samples collected by USGS projects throughout the Northeast and provides accurate measurements of soil water, nonagricultural soils, stream water, and lake water that can be adapted to the specific needs of each study. The laboratory’s quality-assurance program is based on internal and interlaboratory quality-assurance samples and quality-control procedures that were developed to ensure proper sample collection, processing, and analysis. The laboratory includes many state-of-the-art instruments, including an ion chromatograph, an inductively coupled plasma spectrophotometer, a dissolved carbon analyzer, three flow-injection analyzers, a carbon-nitrogen analyzer...