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�171e1 1( Clil d ill ll Uiu?ielltul n+eh' 01 A <br /> PAGE 8 <br /> AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER 9504326 <br /> CLIENT PROJECT ID 41820-003-00 <br /> Quality-Control and Project Summar <br /> All laboratory quality control parameters were found to be within established <br /> limits <br /> 1 <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 Spikes) Aliquot of a sample (aqueous or solid) with added quantities of specific compou'+ds 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 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 /> N Indicates result outside of established Laboratory OC limits. <br />