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' American Environmental Network <br /> PAGE 5 <br /> 1� <br />' AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br />' AEN JCB NUMBER 9702143 <br /> CLIENT PROJECT ID 145-001 2 <br />' Quality Control and Project Summary V <br /> All laboratory quality control parameters were found to be within established <br />' limits <br /> I <br /> 1 <br />' Definitions <br /> Laboratory Control Sample (LCS)/Method Spike(s) Control samples of known composition LCS and Method Spike <br /> data Pre 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 analysts <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 Lar 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 />