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' Alii& cifz Ezvzrozzfzzewczl NeAvoi n <br /> PAGE 7 <br /> AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> I AEN JOB NUMBER 9512142 <br /> CLIENT PROJECT ID D103 <br /> I <br /> Quality Control and Project Summar <br /> IAll laboratory quality control parameters were found to be within established <br /> limits <br /> I <br /> IDefinitions <br /> Laboratory Control Sample (LCS)/Method Spike(s) Control samples of known composition. LCS and Method Spike <br /> I data are used to validate batch anaiytical 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 /> I Method Stank. An analytical control consisting of all reagents, internal standards, and surrogate standards <br /> carried through the entire anatyticat process used to monitor laboratory background and reagent contamination <br /> Not Detected (ND) Not detected at or above the reporting limit. <br /> IRelative 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 /> Idependent and take into account any dilutions performed as part of the analysis <br /> Surrogates organic compounds which are similar to anatytes of interest in chemical behavior, but are not found <br /> in environmental sampies Surrogates are added to aLL blanks, calibration and check standards, samples, and <br /> I spiked samples Surrogate recovery is monitored as an indication of acceptable sample preparation and <br /> instrumental performance <br /> D. Surrogates dituted out <br /> !- Indicates result outside of established laboratory QC Limits. <br /> I <br />