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• Page 4 <br /> 2.0 QA/QC CONTROL OBJECTIVES <br /> QA/QC procedures act as indicators of data quality. The goal of QA is to ensure that data are <br /> scientifically valid, defensible, and of known precision and accuracy. Precision is used to <br /> describe the reproducibility of analytical results. Accuracy denotes the nearness of a measure- <br /> ment to its accepted value and is expressed in terms of error. The objective of QC is to estimate <br /> the quality of analytical data, to determine the need for corrective action in response to identified <br /> deficiencies, and to interpret results after corrective action procedures are implemented. <br /> QC samples from the field and laboratory are used to monitor the precision and accuracy of the data <br /> generated. All phases of sample collection, shipment preparation, and analysis are monitored by <br /> the QC samples and checks. <br /> 2.1 QA/QC Control Procedures <br /> The precision and accuracy of data generated during the performance of this SAP will be ensured <br /> • by conducting stringent field and laboratory QC checks. Table 1 summarizes field QA/QC <br /> requirements and frequencies incorporated into this SAP. Table 2 presents descriptions of the field <br /> QC and minimum collection frequencies. <br /> 2.1.1 Field QC Procedures <br /> The QC of field work is a qualitative process that depends on decisions made by personnel while <br /> performing individual tasks. The professional opinions of field personnel are required to estimate <br /> the influence of field QC on the quality and usability of the data. Data meeting quality standards <br /> will be obtained from the field for specific tasks by the successful completion of sampling <br /> procedures as outlined in this SAP. <br /> As stated, Table 1 lists the field QC samples and collection frequencies required for procedures <br /> outlined in this SAP. At least one set of field QC samples will be prepared for each sampling event <br /> or for every 20 samples. All field QC samples will be packaged and shipped with field samples to <br /> the laboratory in accordance with procedures outlined in Appendix A. Field QC samples for solid <br /> and aqueous matrices are defined below. <br /> CO2072 <br /> PRIVILEGED AND CONFIDENTIAL <br /> = _ _ _M Environmental <br /> C:\PROlECTS16102.00IUt1176102.001(6l?0/96J � �� � I �� � <br />