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American Envtf onmental Netwoi k <br /> 1 <br /> PAGE 8 <br /> 1 <br /> 1 <br /> AEN (CALIFORNIA) <br />' QUALITY CONTROL REPORT <br /> AEN JOB NUMBER 9511015 <br />' CLIENT PROJECT ID 41820000300 <br /> Quality Control and Proiect Summary <br /> All laboratory quality control parameters were found to be within established <br /> limits <br /> i <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 Sptke(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 WC data are advisory <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 /> 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. <br /> Reporting Limit (RL): The lowest concentration routinely determined during laboratory operations The RL is <br /> generally 1 to 10 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 />' Surrogates 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 CC Limits. <br /> 1 <br />