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American Environmental Netwol k <br /> PAGE 5 <br /> AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> ' AEN JOS NUMBER 9608113 <br /> CLIENT PROJECT ID 020200213 1003 <br /> Quality Control and Project Summary <br /> All laboratory quality control parameters were found to be within established <br /> limits <br /> Definitions <br /> Laboratory Control Sampte (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 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 (6D) 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 (°L) The Lowest concentration routinely determined during laboratory operations. The RL is <br /> generally i to 10 times the Method Detection Limit (MDL) Reporting limits are matrix, method, and analyte <br /> ' depeneent and to<e 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 envirornental samples Surrogates are added to all blanks, calibration and check standards, samples, and <br /> spiked sa=tes Surrogate recovery is monitored as an indication of acceptable sample preparation and <br /> instrumental per-ortrance <br /> D Surrogates ciluted out <br /> Indicates result outside of established Laboratory QC limits <br />