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-� ray •� <br /> -�... �..?'dl�r_�l'x•.fL ryy .. _ ?'}'M '4k sx � ��..! t�i;Y Kk- Sli'!f��j ._1� '.74YF3Y yh... .�, ,gib.. +'y <br /> Woodward-Clyde Consuttants <br /> II QUALITY CONTROL <br /> ------------------ <br /> A. PROJECT SPECIFIC QC. spikes and dupls.cates were analyzed <br /> at approximately 10% of the sample load in order <br /> tooestablish <br /> field precision and laboratory accuracy and precis . <br /> Field Precision is measured by using duplicate tests by <br /> Relative Percent Difference (RPD) as in: <br /> 1 (sample concentration) -_-(duplicate-sample-concentration) 100 <br /> RPD = ----- -_ <br /> ( mean concentration of sample and duplicate sample ) <br /> Laboratory Precision is measured by using duplicate spikes by <br /> Relative Percent Difference (RPD) as in: <br /> (spike 1 %REC-)__^(Spike-2-%REG-) 1- * 100 <br /> RPD = -------------- <br /> ( mean %REC ofSpike1 and Spike 2 ) <br /> Laboratory Accuracy (spike recovery) is measured by Percent <br /> - Recovery (%REC) as in: <br /> (�-spiked sample concentration-)-_-( sample-concentratie>n * 100 <br /> %REC - ------------ true trrue concentration of the spike ) <br /> ( See attached Field Precision* and Laboratory Precision and Accuracy <br /> summaries.) <br /> Precision <br /> daccuracy results were within <br /> B. METHOORKA criteriaforthemethod <br /> PA performance <br /> C. METHOD BLANK RESULTS. A method blank is a laboratory-generated <br /> sample which assesses the degree to which laboratorY operations <br /> -positive analytical <br /> and procedures cause falseresults for your <br /> samples. <br /> In the method blanks associated with these samples, target <br /> parameters were not detected at or above the practical quantitation <br /> mts noted on the data sheets in the Analytical Result, Section- <br /> lii <br /> ( e attached reagent water data sheet in Section III. <br /> * If Available pq <br />