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- t <br /> PAGE 7 <br /> AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER: 9503259 <br /> CLIENT PROJECT ID: USA #65 <br /> Quality Control and Project Summar <br /> All laboratory quality control parameters were found to be within established <br /> a limits. <br /> Definitions <br /> Laboratory Control Sample (LCS)/Method Spike(s): Control samples of known composition. LCS and Method spike <br /> data are used to validate batch analytical results. <br /> Matrix Spike(s): Aliquot of a sample (aqueous or solid) with added quantities of specific compounds and ? <br /> subjected to the entire analytical procedure. Matrix spike and matrix spike duplicate GC data are advisory. 1 <br /> ii <br /> Method Blank: An analytical control consisting of all reagents, internal standards, and surrogate standards <br /> carried through the entire analytical process. Used to monitor laboratory background and reagent contamination. <br /> I <br /> Not Detected (ND): Not detected at or above the reporting limit. { <br /> Relative Percent Difference (RPD): An indication of method precision based on duplicate analysis. II <br /> Reporting Limit (RL): The lowest concentration routinely determined during laboratory operations. The RL is <br /> generally ) to 70 times the Method Detection Limit (MDL). Reporting limits are matrix, 'method, and analyte <br /> dependent and take into account any dilutions performed as part of the analysis. <br /> Surrogaies: Organic compounds which are similar to analytes of interest in chemical behavior, but are not found <br /> in environmental samples. Surrogates are added to all blanks, calibration and check standards, samples, and <br /> spiked 'samples. Surrogate recovery is monitored as an indication of acceptable sample preparation and <br /> instrumental performance. <br /> D: Surrogates diluted out. <br /> #: Indicates result outside of established laboratory QC limits. j <br />