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~~~,~ CORE LABORATORIES <br />Western Atlas <br />International <br />.o,o.... ~.,.. <br />TITLE <br />ANALYTICAL CHEMISTRY DIVISION QUALITY ASSURANCE MANUAL <br />' SOP N0. REVISION N0. EFFECTIVE GATE PAGE <br />HC-QAC-02 0 1 /06/92 83 of 104 <br />' Percent Recoverv for Standards or Surrogates <br />' 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 />' iA - B; 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, shall 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. Am example of a <br />control chart is provided in the Laboratory Documentation Manual. <br />' Laboratory established control limits should be within the limits 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 responsibilities. A <br />schematic diagram summarizing the complete data review and approval process is <br />provided in Figure 14-1. <br /> <br />