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4a <br /> -oms <br /> I <br /> Woodward-Clyde Consultants <br /> 11 QUALITY CONTROL <br /> A.-pR03ECT-SPECIFIC QC. spikes and duplicates were analyzed <br /> at approximately 3.0% of the sample load in order.tooestablish <br /> field precision and laboratory accuracy and P Y <br /> Field Precision is measured by using duplicate tests by <br /> Relative Percent Difference (RPD) as in: <br /> (sample-concentration) -_-(duplicate-sample_concentration) I IOG <br /> Rpp = ---- --- - duplicate sample ) <br /> ( mean concentration of sample and <br /> Laboratory Precision is measured by using duplicate spikes by <br /> Relative Percent Difference (RPD) as in: <br /> 1 (Spi.ke 1 %REC-)__(Spike-2_ <br /> RPD _ - <br /> %REC_) - * 100 <br /> = - - ----- ---- <br /> ( mean %REC of Spike 1 and Spike 2 ) <br /> Laboratory Accuracy (spike recovery) is measured by Percent <br /> Recovery (%REC) a-, in: <br /> sample- mple concentration ) <br /> ' ( spiked sample concentration ) ( __ _ * 100 <br /> %CREC ^'---'----_ ( true-concentration-of^the spike } <br /> ttached Field Precision* and Laboratory Precision and Accuracy <br /> See a <br /> ( sulnmaries. ) <br /> lts were within <br /> B. METHOD PERFORMANCE. Pecisiontandmaccuracy resu <br /> EPA performance criteria <br /> eneruted <br /> C. METHOD BLANK <br /> esses thee <br /> degree ltokwhich laboratory operations <br /> sample whichass <br /> and procedures cause false-positive analytical results for your <br /> samples. <br /> In the method blanks associated with these samples, target <br /> parameters were not detected at or above the <br /> yticaltResultsasection. <br /> limits noted on the data sheets in the Analytical <br /> ( See attached reagent water data sheet in Section <br /> * If Available <br /> i <br />