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d <br /> Performance Evaluations j <br /> 1 <br /> CAS laboratories regularly participate in the analysis of inter-laboratory proficiency i <br /> testing (PT) samples. PT are samples of unknown concentration provided by an j <br /> external NELAC accredited PT provider. PT studies are designed to evaluate all <br /> analytical areas of the laboratory. PT samples are analyzed for the following i <br /> programs: <br /> Water supply (WS) samples for the SDWA j <br /> Water pollution (WP) samples for the CWA <br /> Soil samples for the RCRA and CERCLA <br /> ® Water and soil samples for the UST program <br /> Other client and program specific PT studies <br /> i <br /> Scores for these various PT studies are summarized in bar charts found on our <br /> website: www.caslab.com. Copies of the actual results are available upon request. <br /> Audits <br /> t <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 <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 /> kki <br /> Additionally, CAS has an internal audit program. System and data audits are i <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. i <br /> i <br /> Page 18 of 29 <br />