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E <br /> PAGE 8 <br /> r <br />' AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER 95O7376 <br />' CLIENT PROJECT ID 41820-003-00 <br /> Quality-Control and Pr_oiect Summary <br />' All laboratory quality control parameters were found to be within established <br /> limits <br /> Definitions <br /> Laboratory Control Sainple (LCSI/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 OC 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 /> D• Surrogates diluted out <br /> 0 Indicates result outside of established laboratory QC limits. <br />