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Project Plan <br />Revision 6 <br />1/8/1988 <br />Page 16 of 37 <br />are normally not found in environmental samples. <br />' Surrogate spike recoveries shall fall within the control limits set by <br />the laboratory (in accordance with procedures specified in the method or <br />' <br />within 20%), for samples falling within the quantification limits without <br />dilution. Dilution of samples to bring the analyte concentration into the <br />linear range of calibration may dilute the surrogate below the <br />quantification limit. In such events, evaluation of analytical quality then <br />rely on the quality control embedded in the check, spike, and duplicate <br />' spiked sample. <br />5.1.3.6 Physical Testin <br />For physical testing such as pH, ignitability, and corrosivity <br />measurement, one check standard per batch or per 10 samples, whichever <br />comes first, will replace spike sample analysis. <br />5.1.3.7 Standard Add® <br />For metal analysis, standard addition analysis technique will be <br />employed if initial analysis show matrix interference in that particular <br />metal analysis. <br />5.2 Con® Charts <br />A Laboratory Control Chart are used as a tool to identify any QA/4C <br />problems. Mean and S.D.(standard deviation) are used for building the <br />control chart. <br />Upper Control Limit = mean + 3 S.D. <br />Lower Control Limit = mean - 3 S.D. <br />Upper Warning Limit = mean + 2 S.D. <br />Lower Warning Limit = mean - 2 S.D. <br />22 <br />