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ORDER QC REPORT <br /> Definitions and Terms <br /> Page 2 <br /> LC1 , LC2 Results of analyzing duplicate LCS ' s, used to determine <br /> precision . <br /> R1 , R2 Results of analyzing duplicate aliquots of a sample, <br /> Result: with R1 indicating the first replicate and R2 the <br /> second replicate; used to determine precision. <br /> MS, MSD Results of analyzing a matrix spike and a matrix spike <br /> Result: duplicate, used to determine precision. <br /> Relative Calculated using one of the following: <br /> % Diff <br /> (RPD) : JLC1 - LC21 x 100 JR1 - R21 X 100 <br /> ( [LC1 + LC2 ] /2 ) ( [R1 + R21 /2 ) <br /> (MS - MSDI x 100 <br /> ( [MS + MSD]/2 ) <br /> MS, MSD The percentage of analyte recovered in the matrix <br /> % : spikes . The percent recovery calculation is: <br /> MS %: (MS - X) x 100 MSD %: (MSD - X) x 100 <br /> (T - X) (T - X) <br /> where X is the sample result, listed on the analytical <br /> report, and T is the true value, defined below. <br /> True value: The theoretical, or expected, result of a spiked sample <br /> analysis . <br /> NC Flag Indicates that the spike recovery was not calculated <br /> due to high sample concentration relative to the amount <br /> of spike added. <br /> Q Flag Indicates that the quality control measurement is <br /> outside the specified control limits . <br /> Blank Laboratory result of analysis of the method blank. <br /> Result: <br /> RDL BCA-assigned limit, set at a level higher than the <br /> (Reporting method detection limit (MDL) determined using EPA <br /> Detection guidelines . Sample RDLs may differ from the blank RDL <br /> Limit) : if the samples were diluted. <br /> B C Analytical <br />