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<strong>QATS</strong> PES PROGRAM<br />
PES use in the Contract Laboratory Program (CLP)<br />
<strong>PESs</strong> are typically analyzed along with environmental<br />
samples as requested by the EPA Regions.<br />
<strong>PESs</strong> are used to monitor and document the<br />
performance of laboratories and analytical methods.<br />
<strong>PESs</strong> are used to evaluate the performance of all CLP<br />
labs on a quarterly basis (QB Program).<br />
PES analysis is used in the contract solicitation process.<br />
PES results are used to assist in the validation of<br />
environmental sample analysis results.<br />
PES usage enhances the confidence in the quality of<br />
data and the decision-making process.<br />
19th Annual NARPM Training Conference June 2-5, 2009 Atlanta, Georgia 3