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Ai?ici is uii Eizi ii oiiliiewal Nelit of k PAGE 19 AEN (CALIFORNIA) QUALITY CONTROL REPORT ' AEN JOB NUMBER 9410029 CLIENT PROJECT ID 41820-001-00 Quality, Control and Protect Summary Duplicate gasoline/BTEX analysis of sample VB01-10 showed internal standard recoveries outside of QC limits All other 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 GC 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 analysts. 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 samples. Surrogate recovery is monitored as an indication of acceptable sample preparation and instrumental performance D: Surrogates diluted out. # Indicates result outside of established laboratory OC Limits.