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Am Cci1 Ei7Vi1"O7iiiZt'i1iQi Ne11vv01'k <br /> l j PAGE QR-1 <br /> AEN (CALIFORNIA <br /> QUALITY CONTROL REPORT <br />{ AEN JOB NUMBER: 97101362 <br /> CLIENT PROJECT ID: 90954. 03 <br /> t <br /> Quality Control and Project Summary <br />_ C <br /> All samples : <br /> ETBE recovery in the MS is above QC limits. The LCS "and RPDs are all within <br /> QC limits. Ths QC batch is valid as per SOP # AEN-QA'03. 'pH <2 measured after <br /> gas/BTEX analysis. <br /> All laboratory quality control parameters were e found to be; withln established <br /> limits. <br /> I � <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 <br /> 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 laboratorybackground and reagent contamination. <br /> Not Detected (ND): Not detected at or above the reporting limit. <br /> p <br /> Relative Percent Difference (RPO): 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 limit's are matrix. method, and analyte <br /> dependent and take into account any <br /> dilutions performed as part of the anaaisis. <br /> Surrogates: Organic compounds which are similar to analytes of interest in chemical behaviour. but are not found <br /> in environmental samples. Surrogates are added to all blanks, calibration';jand 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 /> f <br />