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American Envii onmental Network PAGE QR-1 AEN (CALIFORNIA) QUALITY CONTROL REPORT AEN JOB NUMBER 9709391 CLIENT PROJECT ID C-178 Quality Control and Pro ect Summar Sample (SB-1, 10-11 5) and (SB-1, 25-26 5) Reporting limits elevated for g/BTEX and EPA 8260 due to high levels of target compounds Sam les run at dilution Sample for EPA 8260 showed non-target compounds Sol extract for EPA 8260 analysis run out of hold time agrees with run inside hold time All laboratory quality control parameters were found to be within established limits Definitions Laboratory Control Sample (LCS)/Method Spikes(s) Control samples of known composition LCS and Method Spike data are used to validate batch analytical results Matrix Spikes) 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 QC 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 (ND) Not detected at or above the reporting limit Relative Percent Difference (RPD) An indication of method precision based on duplicate analyses 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 analyze 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 behaviour but are not found in environmental samples Surrogates are added to all blanks calibration and check standards samples and spiked samples Surrogate recovery is monitored as an indication of acceptable sample preparation and instrument performance D Surrogates diluted out