Laserfiche WebLink
QUALITY CONTROL R3Sg0$1,r.. it <br /> i. METPOD BLANK RESULTS; A method blank (MB) is a laboratory generated sample free <br /> of any contamination. The luethod blank assesses the degree t�� which the <br /> laboratory operations and procedures cause false-posit.iva anal ea t( .r which for <br /> your samples. The method blank results associated "with ,your samples are <br /> attached. I <br /> IABORATORX CONTROL SPIKES <br />�. The LCS Program, <br /> The laboratory control .spike is a well charrcterizled matrix (organic pure <br /> type II for water samples and contamination free '`sand ;for soil fl sam les <br /> whichramples) <br /> t <br /> s spiked.-with certain target parameters and analyzed in duplicate <br /> at approximately 10% of the sample load in orderJ�to assLre the accuracy <br /> and precision of the analytical method. rhe 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 /> Percent Rezovery — ----- ----------------- x 100 <br /> (actual conccntration) j, <br /> Precision is measured using the relative: percent':ldiffere¢jce (RPD) from <br /> duplicate tests, i.e, : <br /> k Recovery of Spike(1) - 8 Recovery of1,Splke <br /> c RPD - ------------------- ------ (2) <br /> - --- <br /> -- -------- x 1,00 <br /> I (S Recovery of Spike + % Recovery of' <br /> b <br /> Control limits for accuracy acid precision are different for aiffereol. <br /> methods. They may also vary with the different -;;unple matrices. The ar <br /> I based on laboratory average historical data andl EPA limits whichs, <br /> are <br /> approved by the Quality Assurance Departiaent. is McLaren Analytical <br /> Laboratory reanalyzes samples if the precisiur. nr accurac• i:: ouL Of <br /> acceptance control limits <br /> ;3 <br /> McLaren <br /> 'F. (CN2345` ` <br />