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IU1, 24. 1997 4:46PM PACIFIC OVERSIGHT N0. 2496 P. 8/13 <br /> • Amern Environmental Network <br /> PAGE 6 <br /> AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER: 9506137 <br /> CLIENT PROJECT ID: L198-G <br /> Quality Control and Protect Summary <br /> All laboratory quality control parameters were found to be within established <br /> limits. <br /> Oetinitiarts <br /> Laboratory Control Sample (LCS)/Method Spike(s); Control samples of known cuapositinn. LCS and Method Spike <br /> data are used to validate botch analytical results. <br /> Matrix Spike(s)= Aliquot of a ample (aqueous or solid) with added quantities of specific canpounds and <br /> subjected to the entire analytical procedure. Matrix spike and matrix spike duplicate OC data are advisory. <br /> Method Blank: An analyticaL control consisting of aLL reagents, internet 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 mothod precision based on duplicate analysis. <br /> Reporting Limit CRL): The Lowest concentration routinely determined during laboratory operations. The RL is <br /> generally 1 to 10 times the Method Detection limit (IDL). Reporting limits are matrfx, aethod, and anatyte <br /> dependent and take Into account any dilutions perfvrmed as part of the analysis. <br /> Surrogates: Organic coupourrds which are clmilar to analytes of interest in chemical behavior, but are not foul <br /> in environsental samples. Surrogates ore added to all blankti. calibration and check standards, samples, and <br /> spiked apple._ surroantc recovery is n itored es an indication of acceptubLe sample preparation mid <br /> instrumental performance. <br /> D: Surrogates diluted out. <br /> S: Indicates result outside of established laboratory OC limits. <br />