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11.0 PEFORMANCE AND SYSTEM AUDITS For the purpose of external evaluation, performance evaluation check samples are analyzed periodically by the laboratory. Internally, the evaluation of data from these samples is done n a continuing basis over the duration of a given project. The QAO may carry out performance and/or systems audits to insure that data of known and defensible quality are consistently produced during this program. Systems audits are qualitative evaluations of all components of field and laboratory quality control measurement systems. They determine if the measurement systems are being used appropriately. The audits may be carried out before all systems are operational, during the program, or after completion of the program. Such audits typically involve a comparison of the activities given in the QA/QC plan described herein, with activities actually scheduled or performed. A special type of systems audit is the data management audit. This audit addresses only data collection and management activities. The performance audit is a quantitative evaluation of the measurement systems used for a monitoring program. It requires testing the measurement systems with samples of known composition or behavior to quantitatively evaluate precision and accuracy. A performance audit may be carried out by or under the auspices of the QAO without the knowledge of the analyst during each sampling event for this program. It should be noted, however, that any additional external QA audits will only be performed if deemed necessary. The PM may schedule systems audits of the sampling activities to ensure that the QAPP and SAP are being adhered to and/or that variances are justified and documented. These audits will be scheduled to allow oversight of as many different field activities as possible, and will be performed by the QAO. 031090-10(4) -18- CONESTOGA-ROVERS&ASSOCIATES