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EXPLANATION OF TERMS BLANK QA/QC - Analyte free sample analyzed to determine if background contamination is present to 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 MCL CALIBRATION QA/QC - Standard analyzed to determine the Accuracy of any instruments and/or techniques used for analysts TYPES ICY => Independent Calibration Verification standard Analyzed to check the accuracy of the standard used to calibrate an instrument or technique CCV => Continuing Calibration Verification standard Analyzed to check the accuracy of the instrument o, technique calibration LCS => Laboratory Control Stapdard Analyzed to check the accuracy of the entire method from prep thru analysis OLS => Detection Level Standard Used for verification and determination of MDL METHOD QA/QC - Matrix specific samples analyzed to detdrmine accuracy and/or precision of the entire method TYPES Dup => Samples are prepared and analyzed to Duplicate to determine the Precision of the method The RPD or Relative Percent Difference is calculated and compared to the MAV for all conststuents BS => 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 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 % REC => 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 Y 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 0 • •