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L" <br />American Environmental Ne4vork <br />AEN (CALIFORNIA) <br />QUALITY CONTROL REPORT <br />AEN JOB NUMBER: 9708110 <br />CLIENT PROJECT ID: 4203-F2 <br />PAGE 4 <br />Quality Control Summary <br />All laboratory quality control parameters were found to be within established <br />` limits. <br />Definitions <br />�I Laboratory Control Sample (LCS)/Methad 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 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 />f , Relative Percent Difference (RPD): An indication of method precision based an 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 QC limits. <br />C <br />