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CORE LABORATORIES <br />' ',~,' <br />' Western Atlas <br />International <br />,e.,~.... ~.~, <br />TI7LE ~~~~ <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />' SOP N0. REVISION N0. EFFECTIVE DATE PAGE <br />HC-QAC-02 0 1 /06/92 83 of 104 <br />Percent Recoverv for Standards or Surrogates <br />t Analyzed Value X 100% = Percent Recovery <br />Known Value <br />' Percent Recoverv for Matrix Spikes <br />Spiked Sample Value -Sample Value X 100% =Percent Recovery <br />' Known Spike Amount <br />' Relative Percent Difference <br />jA - Bl X 200% = Relative Percent Difference <br />A T B <br />' 13.6 Control Charts <br />Control limits shall be established for control samples, spiked samples, and <br />' duplicate samples. <br />These limits, which measure laboratory performance, shhall be based on <br />' historical data which has been produced in the laboratory. Procedures shall <br />be in place for monitoring historical performance and should) include graphical <br />(control charts) and/or tabular presentations on the data. An example of a <br />control chart is provided in the Laboratory Documentation Manual. <br />Laboratory established control limits should be within the lirtriits prescribed in <br />' the applicable method. Laboratory limits should be re-established at least <br />annually. <br />' 14.0 DATA REVIEW AND VALIDATION <br />The following sections detail data review and validation responsibilities for <br />laboratory staff members. Specific job titles referenced in the following sections <br />(which may vary at some ACD laboratories) refer to functional reisponsibilities. A <br />schematic diagram summarizing the complete data review and approval process is <br />' ~ provided in Figure 14-1. <br /> <br />