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GEri� <br /> • GENESIS ENGINEERING 8 REDEVELOPMENT <br /> known, acceptable, and documented quality. To achieve this objective,the following <br /> procedures will be followed: <br /> • Use standard operating procedures for the collection and analysis of soil and <br /> groundwater samples including, chain of custody, calibration,preventative <br /> maintenance, laboratory analysis, reporting, validation, internal QA/QC audits <br /> • Set quantitative goals and units of measure for precision and completeness for each <br /> measured parameter <br /> • Set quantitative goals for representative and comparable data <br /> • Establish procedures for problem identification and correction <br /> The operating procedures to be used during this investigation to Establish Background <br /> Concentrations are described in the SAP. Qualitative descriptions of precision, accuracy, <br /> representativeness, completeness,and comparability parameters are provided below. <br /> Quantitative descriptions are discussed in Section 8.3 - Statistical Assessment of Data <br /> Quality. <br /> 4.1 Accuracy <br /> • Accuracy is the measurement of bias in a system and will be assessed through the evaluation <br /> of the percent recoveries associated with laboratory control samples and matrix spikes. <br /> Accuracy measurements are defined in Section 8.3.1. <br /> 4.2 Precision <br /> Precision is the measurement of the reproducibility of data under a specified set of conditions <br /> and a quantitative measure will be used to assess the variability of a data set in reference to <br /> the calculated average value. This will be assessed by the evaluation of the day-to-day <br /> variances in the laboratory control samples. Precision measurements are defined in Section <br /> 8.3.2. <br /> 4.3 Completeness <br /> Completeness is the measurement of the percentage of measurements evaluated and judged <br /> valid. For this project,the QA objectives for completeness are 95 percent for each analyte by <br /> matrix and analytical method, for water and soil. Completeness is described in Section 8.3.3. <br /> 4.4 Representativeness <br /> Representativeness is a qualitative measure used to determine the degree to which obtained <br /> • data correlate to the population sampled. This parameter will be measured through the <br /> William DePaoli Property 4 of 21 <br /> Quality Assurance Project Plan <br /> February 2012 <br />