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SequoiallCA Dr Mogan Hill, CA 95037 7 ' (408)776-9600 Analytical � FAX(408)782-6308 www scquoialabs can Secor-Rancho Cordova Project ARCO#4932,Stockton,CA MMB0227 3017 Kilgore Rd Suite 100 Protect Number ARCO#4932,Stockton,CA Reported Rancho Cordova CA,95670 Project Manager RustyBenkosky 02/25/03 11 03 Notes and Definitions E The concentration indicated for this analyte is an estimated value above the calibration range of the instrument HC-19 Discrete peak @ C6-C7 HC-21 Chromatogram Pattern Gasoline C6-C10 HT-04 This sample was analyzed beyond the EPA recommended holding time The results may still be useful for their intended purpose 0-09 The result was reported with a possible high bias due to the continuing calibration verification falling outside acceptance criteria 0-11 The continuing calibration standard was outside of the acceptance criteria This should be considered in evaluating the result for its intended purpose Q-19 The method blank contains this analyte at a concentration above the method reporting limit This should be considered in evaluating the data for its intended purpose Q-23 The closing calibration was outside acceptance limits by 1%high This should be considered in evaluating the result The average %difference for all analytes met the 15%requirement and the QC suggests that calibration linearity is not a factor Q-23a The closing calibration was outside acceptance limits by 2%high This should be considered in evaluating the result The average %difference for all analytes met the 15%requirement and the QC suggests that calibration linearity is not a factor Q-23b The closing calibration was outside acceptance limits by 6%high Tlus should be considered in evaluating the result The average %difference for all analytes met the 15%requirement and the QC suggests that calibration linearity is not a factor OB-01 The method blank contains this analyte at a concentration above the reporting limit,however,the concentration is less than 5%of the sample result,which is negligible according to method criteria QM-07 The spike recovery was outside control limits for the MS and/or MSD The batch was accepted based on acceptable LCS recovery QR-07 The RPD was outside control limits The results may still be useful for their intended purpose DET Analyte DETECTED ND Analyte NOT DETECTED at or above the reporting limit NR Not Reported dry Sample results reported on a dry weight basis RPD Relative Percent Difference quota Analytical-Morgan Hill The results to this report ripply to the samples analyzed in accordance with the chain of custody document Unless otherwise stated results are reported on a wet weight bases This analytical report must be reproduced in its entirety 21 of 21