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- r <br /> A»7�carz Eivirbtzlziewal Network <br /> PAGE QR-1 <br /> AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER: 9801149 <br /> CLIENT PROJECT I0: 97-210 <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(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 /> Relative Percent Difference (RPD): An indication of method precision based on duplicate analyses. <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 behaviour, but are not found <br /> in ervironmertal samples. Surrogates are added to all blarks. calibration and check standards, samples, and <br /> spiked samples. Surrogate recovery is monitored as an indication of acceptable sample preparation and <br /> instrument performance. ' <br /> D: Surrogates diluted out. <br /> 1: Interference. <br /> ! ; Indicates result outside of established laboratory QC limits. <br />