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A17 A-d-'QIZ C IZ1'11-oniiiei al lV etl v l k <br /> 1 <br /> PAGE QR-1 <br /> AEN (CALIFORNIA) i <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER: 9711229 <br /> CLIENT PROJECT ID: 90954.0003 <br /> ( S <br />' LQuality Control and Pro "ect Summary <br /> r All laboratory quality control parameters were found !to be within established <br /> L limits. <br /> L <br /> L Definitions <br /> Laboratory Control Sample (LCS)/Method Spikes(s): Control samples of known composition. LCS and Method Spike <br /> r <br /> data are used to validate batch analytical results. . , <br /> r <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, internalstandards. and surrogate standards <br /> carried through the entire analytical process. Used to monitor laboratory;' background and reagent contamination. <br />� - <br /> Not Detected (NO): 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 an l <br /> ysis: <br /> Surrogates: <br /> Organic compounds which are similar to analytes of interest Vn chemical behaviour, 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 /> instrument performance. <br /> D: Surrogates diluted out. <br /> I: Interference. <br /> !: Indicates result outside of established laboratory QC limits. <br /> 6 <br />