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American Environmental Network <br /> . PAGE 15 <br /> AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER: 9806005 <br /> CLIENT PROJECT ID: R603 <br /> Quality Control and -Project Summary <br /> All laboratory quality control parameters were found to be within established limits . <br /> Definitions <br /> Laboratory Control Sample (LCS)/Method Spike(s): Contra[ 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 OC 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 Rt 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 CC limits. <br />