The laboratory for analysis of low-ionic-strength water at the U.S.
Geological Survey (USGS) Water Science Center in Troy, N.Y.,
analyzes samples collected by USGS projects throughout the
Northeast. 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 quality-assurance
and quality-control data were stored in the laboratory's Lab Master
data-management system, which provides efficient review,
compilation, and plotting of data. This report presents and
discusses results of quality-assurance and quality control samples
analyzed from July 2003 through June 2005.
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