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Performance Evaluations <br /> t <br /> f <br /> CAS laboratories regularly participate in the analysis of inter-laboratory proficiency <br /> testing (PT) samples. PT are samples of unknown concentration provided by an I <br /> external NELAC accredited PT provider. PT studies are designed to evaluate all f <br /> analytical areas of the laboratory. PT samples are analyzed for the following <br /> programs: <br /> Water supply(WS)samples for the SDWA <br /> Water pollution (WP) samples for the CWA <br /> Soil samples for the RCRA and CERCLA <br /> s Water and soil samples for the UST program <br /> ® Other client and program specific PT studies <br /> Scores for these various PT studies are summarized in bar charts found on our s <br /> website: www.caslab.com. Copies of the actual results are available upon request. <br /> Audits <br /> i <br /> Each CAS laboratory is audited by the various federal and state regulatory agencies <br /> that certify, accredit and approve the laboratory. Our clients and third-party I <br /> evaluators frequently audit our laboratories as well. The laboratory performs <br /> corrective actions to any audit findings. CAS welcomes external audits as an <br /> opportunity to showcase the QA program. <br /> I <br /> Additionally, CAS has an internal audit program. System and data audits are <br /> routinely performed by the corporate QA Director and by each laboratory's QA <br /> Program Manager. Appropriate corrective actions are performed to any audit <br /> findings. <br /> I <br /> Page 18 of 29 <br /> i <br />