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' American Environmental Network <br /> PAGE 10 <br /> 1 <br /> AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER 9806185 <br /> CLIENT PROJECT ID 03733-009-021 <br /> Quality Control and Pro ect Summar <br />' All laboratory quality control parameters were found to be within established limits <br /> r <br /> Def,m 1,ons <br /> Laboratory Control Sample (LCS)/Method Spike(s) Control samples of known composition LCS and Method Spike data are <br /> used to validate batch analytical results <br /> Matrix Spike(s) Aliquot of a sample (aqueous or solid) with added quantities of specific compounds and subjected to <br /> 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 carried <br /> 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 generally <br /> 1 to 10 times the Method Detection Limit (MDL) Reporting limits are matrix, method, and analyte dependent and take <br /> 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 in <br /> environmental samples Surrogates are added to all blanks, calibration and check standards, samples, and spiked samples. <br /> Surrogate recovery is monitored as an indication of acceptable sample preparation and instrumental performance. <br /> D Surrogates diluted out <br /> # Indicates result outside of established laboratory QC limits <br />