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�� ^- -'rf _ti$. �_ ,x- Y t.��-. _ �� `y � 4� ..,.�, �- F� •r,�-w �,S t -rrr �ut.x - �' 'g � a r istl'I'CI l QC REPORT; Defitliti011s anti 'I'errns / Acculacy 1110 ability ora precedum to delertninc the"true"colicentration of an analyte Precision 'Mlle rcprtxilicibillty of a procedure deutorlstrated by die agreement bcnveerl analyses performed on either lltiplicates of tlic saint sample or a pair of duplicate spikes Batch A group of samples 111alyze41 serluentlally using the same calibration curve, rr.agcnts,and instru;ncm Laboratory Laboratory reagent water spiked with known compounds and subjected to the Control Standard sansc procedures as the samples. "Che LCS thus indicates rite accuracy of the analytical nlcthod and,because it is prepared frolic a different source titan the (LCS) analytical5larlytiused to C3libratC the inStnuncnl,it also serves to double-check the calibration iv[auix QC Quality control tests performed on actual client sampies. For most utvrgmiic ed s analysts,the laboratory uses a pair of duplicate sansplef$tikctid a ss tkt !es topic. For most orga:lic analyses,the laboratory us- s a p: p P (duplicate spikes) LC Result Laboratory result of,in LCS analysis Ur Result Expected result,or true value,of the LCS analysis 1,R''Result: Result of the analysis of replicate aliquots of a sample,with R1 indicating the R first analysis of rise sample and R2 its corresponding duplicate;used to detenninc precision S1, S2 Result Result of the analysis of replicate spiked aliquots,with S l indicating one spike of the salupic and S,, Lite second spike;used to determine precision and accuracy R Bar Result 111c average of replicate airalysis results S Bar Result: 11te average or spike analysis results True value 111e theoretical,or expected,result of a spike sample analysis Percent 111c percentage of analyte recovered. Recovery For LCS,the percent rer-overy calculation is: LC+LT x 100 For spike recoveries,die percent recovery calculatiion is: LS Bar Sant IC Concentration x 100 Spike Amount Relative Percent Calculated using one of the following: Difference(RPD) (R I—R2)x 1� (L$1-_S22)+1(2 (R1 +R2)+. Clank Result 111e result of the analysis of a method blarik,which is reagent water that is analysed using the same reagents,instmu cats and procedures as die samples - - --iiia batch;used to laboratory contamination Reporting Detr--c- BCA-assigned limit based on—but not the sante as—method detection limits tion Litrlrt(RLL) (i11DLs)detennined using EPA guidelines - fi L 1r„rlvriruf