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_ sg a — f BATCH QC DEPORT: Defir_idons and Terms Accuracy The ability of a procedure to determine the"true"concentration of an analyte Precision The reproducibility of a procedure demonstrated by the agreement between analyses performed on either duplicates of the same sample or a pair of duplicate spikes w. Batch A group of samples analyzed sequentially using the same calibration curve, reagents,and instrument Laboratory Laboratory reagent water spiked with known compounds and subjected to the Control Standard same procedures as the samples. The LCS thus indicates the accuracy of the ` (LCS) anaiytiral method and,b=use it is prepared from a different source than the I standard trod to calibrate the instrument,i also serves to double-check the i calibration Matrix QC Quality control tests pc.:forrned on actual client samples. For most inorganic analyses,the laboratory uses a pair of duplicate samples and a spiked sample. l i. For most organic analyses,the laboratory uses a pair of spiked samples (duplicate spikes) LC Result Laboratory result of an LCS analysis LT Result Expected result,or true value,of the LCS analysis RL,R2 Result: Result of the analysis of replicate aliquots of a sample,with R1 indicating the { determine �nysisof sample and R2 its corresponding duplicate;used to precision �on7 SI,S2 Result Result of the analysis of replicate spiked aliquots,with S 1 indicating one spike of the sample and S2 the second'spike;used to determine precision and accuracy - R Har Result The average of replicate analysis results S Bar Result: The average of spike analysis results Trap value The theoretical,ur expected,result of a spik:sample analysis Percent The percentage of analyte recovered. Recovery For LCS.,the percent recovery calculation is: LC+LT x I00 1 For spike recoveries,the percent recovery calculatiion is: (N Bar-SampleConcentration) X100 Spike Amount Relative Percent Calculated using one of the following: Difference(RPD) fRI R2)x 100 LU-- (RI $1 -(R1+R2)-r 2 (S 1 +S2)+2 1 �— Blank Result The result of the analysis of a method blank,which is reagent water that is analysed using the same reagents,instruments and procedures as the samples in a batch;used to determine laboratory contamination i Reporting Detec- BCA-assigned limit based o"ut not the same as—method detection limits 1 tion Limit(RDL) (MDLs)dsterniined using EPA guidelines j I — H r:,rned,•rlrnr i w i 4 i i i , �111i4L� ■ �i��asirc��■�■s�■1�■v■ �......'