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American Environmental Network <br /> PAGE 10 <br /> i <br /> AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER 9701226 <br /> CLIENT PROJECT ID D107 <br /> Quality Control Summar <br /> All laboratory quality control parameters were found to be within established <br /> limits <br /> I <br /> Definitions <br /> Laboratory Contral 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 CC 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 />