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Amei scan Environmental Network MPAGE 14 AEN (CALIFORNIA) QUALITY CONTROL REPORT AEN JOB NUMBER 9703241 CLIENT PROJECT ID 8603 Quality Control Summary Sample MW-12 Reporting limit elevated for Methyl t-Butyl Ether by EPA 8260 due to high levels of non-target compounds Sample run at dilution All laboratory quality control parameters were found to be within established limits Definitions Laboratory Control Sample (LCS)/Method Spike(s) Control samples of known composition LCS and Method Spike data are used to validate batch analytical results Matrix Spike(s) Aliquot of a sample (aqueous or solid) with added quantities of specific compounds and subjected to the entire analytical procedure Matrix spike and matrix spike duplicate OC data are advisory. Method Blank An analytical control consisting of all reagents, internal standards, and surrogate standards carried through the entire analytical process Used to monitor laboratory background and reagent contamination. Not Detected (NO) Not detected at or above the reporting limit Relative Percent Difference (RPD) An indication of method precision based on duplicate analysis Reporting Limit (RL)* The lowest concentration routinely determined during laboratory operations. The RL is generally 1 to 10 times the Method Detection Limit (MDL) Reporting limits are matrix, method, and analyte dependent and take into account any dilutions performed as part of the analysis Surrogates Organic compounds which are similar to analytes of interest in chemical behavior, but are not found in environmental samples Surrogates are added to all blanks, calibration and check standards, samples, and spiked samnioc Su—nnate necover, is monitored ry.cav of er.antehia gamnla n—mn t, 8-d instrumental performance D Surrogates diluted out # Indicates result outside of established laboratory QC limits