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American Environmental Network, - <br /> PAGE 12 <br />' AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br />' AEN JOB NUMBER 9705332 <br /> CLIENT PROJECT ID <br />' Quality Control Summar <br /> All laboratory quality control parameters were found to be within established <br />' limits <br /> I <br />' Definitions <br /> Laboratory Control Sample (LCS)/Method Sp,ke(a) 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 soted) with added quantities of specific compounds and <br /> subjected to the entire analytical procedure. Matrix spike and matrix spike duplicate OC data are advisory. <br />' Method Blank An anatyticaL 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 /> 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 /> 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 atL 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 OC limits. <br /> I <br />