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b <br /> OR <br />� S <br /> QUALITY CONTROL REPORT <br /> METHOD BLANK RESULTS: A method blank (MR) is a laboratory generated sampla free <br /> of any contamination. The method blank assesses the degree to which tho <br /> laboratory operations and procedures cause false-positive analytic,l results for <br /> ,. your samples. The method blank r4isults associatett wLth your samples are <br /> attached. <br /> LABORATORY CONTROL SPIKES <br /> 'tne LCS Program: <br /> The laboratory control spike Is a Wil charactarized matrix (n;:ganic puri <br /> e. <br /> VP II for water samples and contamination free sand for soil sa:r.plra) <br /> which is spiked with certain target rarametcrs and analyzed in dtci,iicat'a <br /> at approximately lot of rhe sample load in order to assure the itccuracy <br /> and precision of the analyr.ical method. The results of the iaboracury <br /> control spike associated with your samples are attached, <br /> 3 s Accurac is measured using percent recove!.y, i.e. : <br /> (mea•:ured eoncentrat:,on) <br /> Percent Recovery — ------------------------ x 100 <br /> (actual concentration) <br /> Precision is measured using the relativo percent differc-lWe (UPD) irons <br /> ' duplicate tests, i.e. : <br /> % Recovery of Spike - 8 Recovery of Spike cz! <br /> RPD — ---------------------------------------- ----. ..----- <br /> X 100. <br /> (% Recovery of Spike'.tll + Recovary of Spike(,, )/2 <br /> Control limits for accurar,y ar,d precision are t13 fferent for di.i:ferenr <br /> methods. They may also vary with _he different sample ma!ri es. They are <br /> based on laboratory aforag+e historical data and EeA limits which :arc <br /> approved. by the Quality. Assurance 9epartmetet. Mcl.aren Artrlyt lt-al <br /> Laboratory reanalyzes samples if the pr:,cision or aCCuraCy is vu; t:f <br /> acceptance co-itrol limits, <br /> i <br /> �a- <br /> i <br /> (02346) <br /> l� <br />