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i <br /> American Environmental Network <br /> PAGE QR-1 <br /> AEN (CALIFORNIA) <br /> QUALITY CONTROL REPORT <br /> AEN JOB NUMBER 9806049 <br /> CLIENT PROJECT ID SANCHEZ PROP <br /> Quality Control andPro.ject Summary <br /> All laboratory quality control parameters were found to be wlthln established <br /> limits <br /> Definitions <br /> Laboratory Control Sample (LCS)/Method Spikes(s) Control samples of known composition LCS and Method Spike <br /> data are used to validate batch analytical results <br /> Matrix Spikes) Aliquot of a sample (aqueous or solid) with added quantitiesof specific compounds and <br /> subjected to the entire analytical procedure Matrix spike and matrix spike duplicate QC 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 analyses <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 wh,ch are similar to analytes of interest in chemical behaviour 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 /> instrument performance <br /> D Surrogates diluted out <br /> 1 Interference <br /> Indicates result outside of established laboratory QC limits <br />