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n <br /> u.�i. <br /> QUALITY CONTROL REPORT <br /> HETHOD BLANK RESULTS: A method blank (HB) is a laboratory generated sample fre <br /> of. any contamination, The n,trt}god blank asSesses the degree ca which th <br /> ' 1 <br /> laboratory operations rind procedures cause falnr^-positive analyticril results fe <br /> 1:A• '. your samples. The method blank results associated ,with your snnlpl�s a: <br /> ti. attached. <br /> I <br /> WORATORY CONTROL SPIKES <br /> The LC5 Program: <br /> 4 The laboratory control spike is a well characterized matrix (organic pur, <br /> type 11 for water samples and contamination free sand for soil samples. <br /> which is spiked Frith"certain target Parameters and analyzed in duplicat <br /> F ht approximately 104 of the snmplP load In order to assure the accurac <br /> ! and precision of the analtical method. <br /> y The reqults of the laborator <br /> EJ' control spike associated with your''samples are attached. <br /> Accuracy is measured using percent recovery, i.e, : <br /> (measured-concentration) <br /> Percent R.:covery <br /> X 100 <br /> (actual coricentration) <br /> «S Precision is me.,sured aging the relative. percent difference WD) fro: <br /> duplicate tests, i.c.' <br /> _ 8 Recovery of Spikect> - 8 Recovery of Spike <br /> (B.Recovery of 5pikecl7 �..................<2? x 100 <br /> Recovery of Spike <br /> (z) }�2 <br /> Control limits 'or accuracy.. and recision are different for' differev <br /> a� p <br /> methods. They m iy also vary with the different sainple matrices, They at' <br /> based on laboraLary avera e <br /> g historical data and. EPA limits which ar <br /> approved by thj Quality Assurance <br /> Department. Ms Laren Analytico z <br /> L'rboratory rean:llyzes samples i¢ the precision or arenYacv au! e <br /> acceptance control limits., <br /> Vf<e�T mss. - <br /> J _ <br /> r 4 ' <br /> McLaren <br /> (DC5-CN256M <br /> - '� <br />