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#.�,f., � � •.. .. QUALITY 'CONTROL REPORT <br /> F TROD BLANK RESULTS. A method blank (MB) is aLlaboratory 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 are <br /> 1 <br /> 4 attached. <br /> IABOxATORY CONTROL.SPIKES - <br /> s The LCS Pr <br /> ograa: f <br /> The laboratory control spike is a wall characterized matrix (organic pure <br /> t!rpe II for water samples andcontamination free,.sand for soil samples) <br /> which is spiked with certain target parameters and analyzed in duplicate <br /> :at approximately 108 of the sample load in order_ to assure the accuracy <br /> ..;~ and precision of the analytical method' The results of the laboratory <br /> control spike associated with your samples are attached. <br /> Accuracy is measured using.percent recovery, i e. <br /> (measured concentration) : <br /> ar Percent Recovery x 100 <br /> (actual concentration)- <br /> may:..:'` _ Precision is measured using the relative percent difference (RPD) from <br /> duplicate tests, i.e. . <br /> Recovery of Spike $ Recovery of Spike (2) <br /> <" RPD — -------- -- ----------------------- <br />, - ---------------------------------- x 200 <br /> Recovery of Spikei + $ Recovery of SpikeC2) )/2 <br /> Control limits for accuracy and precision are different for different <br /> ;.; ., methods. They may also vary with the different sample matrices. They are <br /> based on laboratory average historical data and EP.,1 limits which are <br /> approved by the Quality Assurance Department. McLaren Analytical <br /> Laboratory reanalyzes 'samples if the precision or accuracy is out of <br /> acceptance control limits. <br /> AM—Nal McLaren <br />» : `.` (DC3-CN2576) <br />