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,..L <br /> QUALITY CONTROL REPORT <br /> METHOD BLANK RESULTS: A method blank (MB) 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 se.m.;l.es. The method blank results associated with your samples are <br /> attached. <br /> LABORATORY CONTROL SPIKES <br /> The LCS Program; <br /> "he laboratory control spike is a well characterized matrix (organic pure <br /> tYPe II for water samples and contamination free sant 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 /> aro' ;)recision of the analytical method. The results of rhe laboratory <br /> control spike associated with ,your samples are attached. <br /> Accuracy is measured using percent recovery, i..e. : <br /> (mean;ured concentration) <br /> Percent Recovery — - -- - --- --- ---- --- - - - - - - x 100 <br /> (actual concentration) <br /> Precision is mea-,sed using the relative percent difference (RPD) from <br /> dudlicate tests, i .e . : <br /> 8 Recovery of Snike(I) - 8 Recovery of Spike (2) <br /> RPD - - - - --- - - -- - ----- - - ---- - - x 100 <br /> (8 Recovery of Spike,.,) + 8 Recovery of Spike(2) )/2 <br /> Control limits for accuracy and precision are different for different <br /> merhods. They may also vary with the different sample matrices. They are <br /> based on laboratory average historical data and EPA limits which aie <br /> approved by the Quality Assurance Department. McLaren Analytical <br /> Laboratory reanalyzes sampl(s if the precision or accuracy is out of <br /> acceptance control limits . <br /> =MCLaren <br /> (CN2349) <br />