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American Eiivironmewal Net vork <br /> PAGE 6 <br /> I <br /> AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER 9506322 <br /> CLIENT PROJECT ID D-102 <br /> Quality Control and Project Summar <br /> IAll laboratory quality control parameters were found to be within established <br /> limits <br /> I <br />' Defirntions <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 QC 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 simi tar 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. <br /> 1 <br />