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Alii ric an L�ii vij-olillieial it Neli-vurk PAGE 5 M;1 AEN (CALIFORNIA) QUALITY CONTROL REPORT AEN JOB NUMBER: 9505243 CLIENT PROJECT ID: WINNER FORD Quality Control and Project Summary All laboratory quality control parameters were found to be within established limits. i Definitions E Laboratory Control Sample (LCS)/Method Spike(s): Control samples of known composition. LCS and Method Spike data are used to validate batch analytical results. Matrix Spike(s): Aliquot of a sample (aqueous or solid) with added quantities of specific compounds and subjected to the entire analytical procedure. Matrix spike and matrix spike duplicate QC data are advisory. Method Blank: An analytical control consisting of all reagents, internal standards, and surrogate standards carried through the entire analytical process. Used to monitor laboratory background and reagent contamination. E Not Detected (ND): Not detected at or above the reporting limit. Relative Percent Difference (RPD): An indication of method precision based on duplicate analysis. i Reporting Limit (RL): The Lowest concentration routinely determined during Laboratory operations. The RL is generally 1 to 10 times the Method Detection Limit (MDL). Reporting Limits are matrix, method, and analyte dependent and take into account any dilutions performed as part of the analysis. Surrogates: Organic compounds which are similar to analytes of interest in chemical behavior, but are not found in environmental samples. Surrogates are added to all blanks, calibration and check standards, samples, and spiked samples. Surrogate recovery is monitored as an indication of acceptable sample preparation and instrumental performance. D: Surrogates diluted out. #: indicates result outside of established Laboratory QC Limits. I 4 k I f