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1 <br />1 <br />1 <br />1 <br />1 <br />Performance Evaluations <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 <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 <br />programs: <br />e Water supply (WS) samples for the SDWA <br />e Water pollution (WP) samples for the CWA <br />e Soil samples for the RCRA and CERCLA . <br />Water and soil samples for the UST program <br />e Other client and program specific PT studies <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 />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 />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 />Page 18 of 29 <br />