Laserfiche WebLink
-Y FL+ j , } �� ,�•.%: iii. <br /> i� —is� K .. -. l 9. fl+ k 1. r••:• fi ..., <br /> •QUALITY CONTROL. RSPORT <br /> AIVr..,�� <br /> .. OD BLANK RESULTS: A method blank (MB) is a laboratory generated sample free <br /> o£ I any contamination. The method blank assesses the degree to which the <br /> ' laboratory operations and procedures cause false-positive analytical results for <br /> a 4 your samples The method blank results associated with `.your "samples are <br /> attached.: <br /> . . LABORATORY CONTROL..SPIKES ` <br /> !fit The LCS Progran: $ y_ <br /> The laboratory control spike is a well charactezized matrix (organic pure <br /> r +� a <br /> �, j• type II for water samples and contamiia&tion 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 /> and precision. of the analytical method; The results ` ot the . laboratory <br /> control spike associated with your samples are attached. <br /> Accuracy is measured usring.percent recovers' i .e. : <br /> 0, (measured concentration) <br /> ` Peicent.Recovery —' ------- - - ---- <br /> X .100 <br /> (actual concentration) <br /> Precision is measured using the relative percent difference (RPD) from. <br /> duplicate tests, i.e. : <br /> t'•.,•.. $-Recovery of <br /> RPD -Spiketl�---$-Recovery of <br /> - -Spike-(z)- x• 100 <br /> i3c rF -.- -- <br /> (% Recovery of Spike0) + $ Recovery of Spike(,) )/2 <br /> K. <br /> Control limits for accuracy and precision are different for different <br /> 1% 4 methods. :They may also vary with the different sample matrices. They are <br /> . =• based on laboratory average historical data and EPA limits which are <br /> ,&;, approved by the Quality ' Assurance 'Department. , McLaren Analytical <br /> Laboratory reanalyzes 'samples , if the ptlecision or accuracy is out of <br /> ,mss i <br /> acceptance control ..limits, <br /> .•1 fir•' • - <br /> — McLaren <br /> (DC3-CN2576) <br />