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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs com <br /> SECOR International-Rancho Cordova Project ARCO 595,Stockton,CA <br /> 3017 Kilgore Road,Suite I00 Prglect Number 595,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/19/02 14 47 <br /> Volatde Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> lAnalytr Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2040169-EPA 5030B JP/TJ <br /> LCS(2040169-SSI) Prepared&Analyzed 04/17/02 <br /> Methyl tert-butyl ether 227 050 ug/l 250 908 60-140 <br /> Surrogate 1,2-DCA-d4 260 11 250 104 60-140 <br /> Matnx_Spike(2040169-MSI) Source S204276-05 Prepared&Analyzed 04/17/02 <br /> Methyl tert-butyl ether 236 0 50 ug/l 250 ND 944 60-140 <br /> Surrogate 12-DCA-d4 270 " 250 108 60-140 <br /> Matrix Spike Dup(2040169-MSDI)__ Source 5204276-05 ___ Prepared&Analyzed 04/17/02 <br /> Methyl tert-butyl ether 239 050 119/1 25 0 ND 956 60-140 126 25 <br /> Surrogate 12-DCA-d4 271 250 108 60-140 <br /> tlola Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 12 of 13 <br />