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EXPLANATION OF TERMS BLANK QA/QC - Analyte free sample analyzed to determine if background contamination is present in any instrument or techniques used for analysis. TYPES DLR => Detection Limit for Reporting purposes. MDL => Method Detection Limit. This number represents the smallest non-zero value that FGL can reproduce for a method. The DLR must be greater than or equal to the MDL. CALIBRATION QA/QC - Standard analyzed to determine the Accuracy of any instruments and/or techniques used for analysis. TYPES ICV -> Independent Calibration Verification standard. Analyzed to check the accuracy of the standard used to calibrate an instrument or technique. I CCV => Continuing Calibration Verification standard. Analyzed to check the accuracy of the instrument or technique calibration, ""��i LCS -> Laboratory Control Standard. Analyzed to check the accuracy of the entire method from prep thru analysis. �J DLS => Detection Level Standard. Used for verification and determination of MDL. METHOD QA/QC - Matrix specific samples analyzed to determine accuracy and/or precision of the entire method. TYPES Dup => Samples are prepared and analyzed in Duplicate to determine the Precision of the method. The RAD or Relative Percent Difference is calculated and compared to the MAV for all constituents. DS => Blank Spike / Blank Spike Duplicate. A Laboratory Blank matrix is Spiked with a known amount of analyte then prepared and analyzed along with a batch of samples. j MS => Matrix Spike / Matrix Spike Duplicate. A Client provided matrix is Spiked with a known amount of analyte then prepared and analyzed along with a batch of samples. CALCULATIONS % AEC => Percent Recovery of an analyte introduced (spiked) at a know level (Concentration). % REC should be within the AR. AR => Acceptance range of the % REC for an analyte. The AR is determined by averaging all % REC data for a specific matrix and then calculating the 95 % confidence interval. % DIF => (Relative) Percent Difference of a sample analyzed in duplicate. % DIF should be <= MAV. MAV => Maximum Acceptance Value for the % DIF of an analyte. The MAV is determined by averaging all % DIF data for a specific matrix and then calculating the 95 % confidence interval. Conc. => The theoretical ammount of analyte present in the sample prior to analysis. • => Indicates a special or modified DLR was applied for the acceptance criteria. => Indicates the average concentration spiked for MS/MSD or BS/BSD when the concentration spiked was not identical for both QC samples.