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ll l A 61 1 ( l"" 0 17"'12/2LC<L PACE QR-1 AEN (CALIFORNIA) QUALITY CONTROL REPORT AEN JOB NUMBER 9712009 CLIENT PROJECT ID 62574 0001 Quality Control and Project Summary Sample (PZ-1) Results for gas/BTEX are estimated due to poor internal standard response The sample was also run after a high level sample and positive results may be due to carryover from previous sample 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 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 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 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 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 I Interference Indicates result outside of established laboratory QC limits