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IAmerican Environmental Network <br /> PAGE 12 <br /> AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER 9509046 <br /> I CLIENT PROJECT ID 145-001 4 <br /> Quality Control and Project Summar <br /> All laboratory quality control parameters were found to be within established <br />' limits <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 /> I 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 analysis <br /> Reporting Limit (RL) The lowest concentration routinely determined during laboratory operations The RL is <br /> generally 1 to 3O 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 esstablished laboratory QC limits. <br /> 1 <br />