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J. <br /> r , <br /> QUALITY LOliTROL RBP0;M; <br /> METHOD BLANK RESULTS: A method blank (MB) Is a laboratory generated sample free <br /> of any contamination. The method blank asresses the degree to which the <br /> laboratory operations and procedures cause false-positive analytical results fur <br /> your samples. The method blarik results associated with {your samiples are <br /> attached. i <br /> I <br /> i <br /> LABORATORY CONTROL SPIKES ! E <br /> The LCS Program: pis <br /> The laboratory control spike is a well characterized matrix (organic }cure <br /> type II for water samples and contamination freel�sand !for soil samples) <br /> which is spiked with certain target parameters and analyzed in duplicate <br /> at approximately 10% of the sample load in ordar °to assure the accuracy <br /> and precision of the analytical method. The results ,Iof the laboratory <br /> control spike associated with your samples are attached. � <br /> ! Accuracy is measured using percent recowerylo i.e1 : <br /> (measured concentration) <br /> Percent Rezovery — ----------------- -------L x 100 <br /> (actual con.encration) <br /> Precision is measured using the relative percent difference (RPD) from <br /> duplicate tests. i.e. : <br /> 1} Recovery of Spike(l) - % Recovery of Spike f2, <br /> RPD - ------------------------------------ `---- -------- x 1.DC► <br /> (% Recovery of Spike(l) + W Recovery o'f Spike,2) )/2 <br /> Control limits for accuracy and precision are diftereItc for difiereilL <br /> methods. They may also vary with the different s4ple matrlueA. They are <br /> based on laboratere average. historical data and EPR' limi-s which are <br /> approved by the duality Assurance Department. McLaren Analytic::: <br /> Laboratory reanalyzes sanples if the precisioi. i or acrursc.J is oul- <br /> aC <br /> acceptance control limits. <br /> 11•Y Z <br /> .5•' a' <br /> - <br /> McLaren <br /> ,r. (CN234S) <br />