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?t <br /> QUALITY CONTROL REPOR,T.:::i <br /> KETHOD BLANK RESULTS: A method blank (MB) is a laboratory generated sample free <br /> of any contamination. The method blank assesses the degree t« which rhe <br /> laboratory operations and procedures cause false-positive ana:lyr.ical results Eur <br /> your samples. The method blar;k results associated with" your samples are <br /> attached. 3 <br /> LABORATORY CONTROL SPIKES <br /> The LCS Program: I: <br /> The laboratory control spike is a well characterized matrix (organic pure <br /> Type II for water samples and contamination free 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 order to assure the accuracy <br /> E and precision of the analytical method. The results' of the laboratory <br /> control spike associated with your samples nre a`trach6d. <br /> Accuracy is measured using percent recovery, i.e. : <br /> �p <br /> If <br /> (measured concentracian <br /> Percent Rezovery — - --------- ----------- ----- x 100 <br /> I'r <br /> (actual concentratio "n) <br /> I <br /> Precision is measured using the relac.ive pi,rcerit difference (RPD) from <br /> III duplicate tests, i.e. : I! <br /> B Recovery of Spike(i) - $ Recovery of Spike (2) <br /> RPD — ---- - ---------- -------------------- 'r --- ------ x 3.00 <br /> (8 Recovery of Spike + R Recoveryiof Spike' <br /> (`) )/2 <br /> IM <br /> Control limits for accuracy aiid precision are�differene for different. <br /> methods. They may also vc~y with the different ,,�Lmple I rric;e�. l:z4v ara <br /> based on laboratory average historical data aid EPS lim'_t.s which are <br /> approved by the Quality Assurance Departwrr«. McLaren Ana l«tic_�: <br /> Laboratory reanalyzes sataple if ' the prc-cisiut:` or accurac,+ is 0 U L 0f <br /> acceptance control limits. <br /> i Ik <br /> y <br /> c {,4 <br /> McLaren <br /> Ljk <br /> ri Ii <br /> f <br /> lll[ . <br />