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American Environmental Network <br /> PAGE 5 <br /> AEN {CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER 9805196 <br /> CLIENT PROJECT ID ARC PUMP & WELD <br /> Quality Control and Pro ect Summar <br /> All laboratory quality control parameters were found to be within established limits <br /> Definitions <br /> Laboratory Control Sampte (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 anatyticaL 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 generatly <br /> 1 to 10 times the Method Detection Limit (MDI.) 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 /> • <br />