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American Environmental Network <br /> PAGE 16 <br /> AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER 9511384 <br /> CLIENT PROJECT ID 042020190 2003 <br /> ualit 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 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 <br /> carried8 through he entre anattical yticat process. sed to monitor Laboratory backgtrol consisting of all reagents, internal rdound and and <br /> surrogatestandards <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 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 /> is spiked samples Surrogate recovery is monitored as an indication of acceptable sample preparation and <br /> instrumental performance <br /> D. Surrogates diluted out <br /> 0. indicates result outside of established laboratory QC limits <br />