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.. �. a. .•' .-� .�" _4:-.;.�. .�, -;r��€..aar ..�. _ -. .� �;v�. ,�.. ::r�: � ..� v:�_��. ,» �.z;�.-�"..�`','_.�;�., ''ar-s�"_:z�•- nom...., _ �.•�,�e.a,.�;: <br /> `:'k"•- �v :. 'b -�•. i�',,,. ek: ,k;'. x.+'• _ .y' .ski.. .r i�,,. :`L <br /> I U7 <br /> 4 <br /> ti a_. .:. <br /> QUALITY CONTROL REPORT <br /> METHOD BI IrK RESULTS: A riethod blank (HE) is a laboratory generated sample free <br /> of any contamination, The method blank assesses the degree to which the <br /> laboratory oporatJo_-- and procedures cause false-positive analytical results for <br /> -- results asya sated with your samplesaro <br /> samples. The method blank <br /> attached. <br /> LABORATORY coNTROL SPIKES <br /> The LCS Program: <br /> The laboratory control spike is a Well charar.teri_ed matrix (organic pure <br /> E: . stype 11 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 108 of the sample load in ander 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 /> g (measured concentration) <br /> — ------------------------ x lQ6 <br /> M Percent Recovery <br /> (actual concentration) <br /> ,•,.... <br /> Precision is measured using the relative percent difference (RPD) from <br /> duplicate tests, i.e.; <br /> Recovery of Spikei4r - t Recovery of Spike (7) <br /> RPD --------------------- - x 1D0 <br /> + 8 Recover of Spike )/2 <br /> (8•kecovery•of Spike y � (23 � <br /> Control limits for accuracy and precision are different for :cif forer,t <br /> methods. They may also vary with the different samp)e matrices. 'They are <br /> tc ..:•• <br /> y d FPA limits which er <br /> based on laboratory average historical dada an <br /> r <br /> ;�.,,.=... . approved by. the Quality Assurance Department, McLaren Analytical <br /> ' Laboratory reanalyzes samples if the precision or accuracy is out of <br /> ' <br /> :i�•-".Z.'...... acceptance control limits. <br /> �'',`•.. <br /> McLaren <br /> (02346) <br /> jf <br /> U E, a CTION li LLS <br /> ' DOGMWrCANNUr BE <br /> L a <br /> DM TO M <br /> C MITICAN1 4F THE O G <br />