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A*-iean Environmental Nenvork <br /> �F .# <br /> PAGE 5 <br /> i <br /> I <br /> AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER: 9505022 <br /> CLIENT PROJECT ID: D-105 <br /> Quality Control and Pro.iect Summary <br /> All laboratory quality control parameters were found to be within established <br /> limits. <br /> 1 <br /> • <br /> 1 <br /> I <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 analysis. <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 behavior, 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 /> instrumental performance. <br />' 0: Surrogates diluted out. <br /> #: Indicates result outside of established laboratory QC limits. <br />