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685 Jarvis Dr Sequoia blargan Hill,CA 95037 37 (408)776 9600 r Analytical FAX(408)782-6308 www sequoialabs can ecor-Rancho Cordova Project ARCO 04932,Stockton,CA MLK0860 3017 Kilgore Rd Suite 100 Project Number ARCO#4932,Stockton,CA Reported Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/23/02 10 48 Notes and Definitions E The concentration indicated for this analyte is an estimated value above the calibration range of the instrument f HC-12 Hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel �- HC-19 Discrete peak @ C6-C7 HC-21 Chromatogram Pattern Gasoline C6-C 10 3 HT-04 This sample was analyzed beyond the EPA recommended holding time The results may still be useful for their intended purpose HT-RE This sample was re-extracted 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 0-10 The result was reported with a possible low bias due to the continuing calibration venf cation falling outside the acceptance criteria Q-23 The closing calibration was outside acceptance limits by-31% This should be considered in evaluating the result The average% difference for all analytes met the 15%requirement and the QC suggests that calibration Imeanty is not a factor Q-23a The closing calibration was outside acceptance limits by 8% 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 28 The opening calibration verification standard was outside acceptance entena by 3% Although the Laboratory Control Sample verified the accuracy of the batch,this should be considered in evaluating the data for its intended purpose 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-02 The RPD result exceeded the control]emits,however,both percent recoveries were acceptable Sample results for the QC batch were accepted based on percent recoveries and completeness of QC data S-02 The surrogate recovery for this sample cannot be accurately quantified due to interference from coelutmg organic compounds present in the sample S-LIM The surrogate recovery was outside control limits The result may still be useful for its 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 in this report apply to the samples analyzed in accordance with the chain of custody document Unless otherwise stated,results are reported on a wet weight b4sts This analytical report must be reproduced in its entirety Page 23 of 23