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American Environmental Network <br /> PAGE 18 <br /> r - <br /> AEN (CALIFORNIA) <br /> ' QUALITY CONTROL REPORT <br /> AEN JOB NUMBER 9604427 <br /> CLIENT PROJECT ID 042020215 <br /> Quality Control and Pro ect 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 Spikes) 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 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 (FED): 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 il) 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 /> ' r Indicates result outside of established laboratory DC Limits <br /> I <br /> I <br />