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L <br /> + <br /> i lye <br /> QUALITY CONTROL REPORT <br /> METHOD BLANK RESULTS A method blank (MS) is a laboratory generated sample free <br /> Of any contamination The method blank assesses the degree to which the <br /> laboratory operations and procedures cause false-positive analytical results for <br /> your samples The method blank results associated with your samples ere <br /> attached <br /> ) <br /> LABORATORY CONTROL SPIKES ' <br /> The L.CS Program <br /> The laboratory control spike is a well characterized matrix (organic pure <br /> C;pe II for water samples and contamination free said for soil samples) <br /> which is spiked with certain target parameters and analyzed in duplicate <br /> at approximately 10% of the sample load in order to assure the accuracy <br /> and precision of the analytical method rho results of the Laboratory <br /> control spike associated with your samples are atiA40" <br /> ed <br /> xi.", <br /> r 9 <br /> Accuracy is measured using percent recover',r �#�`e <br /> (measured concentratioli) y, <br /> Percent Recovery — -- --------- - ----- x 100 <br /> (actual concentration) <br /> Precision is measured using the relative percent difference (RPD) from <br /> duplicate tests, i e <br /> % Recovery of 5pike0? - 8 Recovery of Spike (2) <br /> RPD — - ---- ----- ---- -- ----- ----- - ---- --- �,__.-. --- -• _ - - x 100 <br /> (8 Recovery of Spike(l) + $ Recovery of, Spikei2) )/2 <br /> Control limits for accuracy and precision are different for different <br /> methods They may also vary with the different sgfple matrices They are <br /> based on laboratory average historical data avid EPA limits which are <br /> approved by the Quality Assurance Department, McLaren Analytical <br /> Laboratory reanalyzes samples if the precision of accuracy is Out of <br /> acceptance control limits <br /> F ' <br /> ) r r <br /> I} <br /> _ F 5 <br /> 1 D r r <br /> McLaren <br /> (CN2330) <br /> 'r <br />