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Anic i !c alt Elll 11 of?l1lew(il Nelit of <br /> PAGE 7 <br /> i <br /> ' AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER 9410205 <br /> ' CLIENT PROJECT ID 41820-001-00 <br /> ' Quality Control and Pro,lect Summary <br /> ' Gasoline/BTEX sample MW-5 was taken from a preserved 1-liter amber bottle with <br /> an approximately 500 uL bubble of headspace All VOA vials had been used during <br /> initial analysis <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 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 analysts. <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 analysts. <br /> Surrogates, Organic compounds which are similar to analytes of interest to chemical behavior, but are not found <br /> to 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 /> instrumental performance <br /> D: Surrogates diluted out. <br /> # Indicates result outside of established laboratory QC limits <br />