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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 100 Project Number 595,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/21/02 16 26 <br /> Total Purgeable Hydrocarbon,BTEX and MTBE by DHS LWIF- Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC APD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2020131 -EPA 5030B(PIT} <br /> Blank(2020131-BLKI) Prepared&Analyzed 02/12/02 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether ND 2 5 " <br /> Surrogate a,a,a-Trtfluorotoluene 894 100 894 60-140 <br /> LCS(2020131-BSI) _ Prepared&Analyzed 02/12/02 <br /> Benzene 7 11 050 ug/1 100 - 71 1 70-130 <br /> Toluene 849 0 50 10 0 849 70-130 <br /> Ethylbenzene 9 03 0 50 10 0 90 3 70-130 <br /> Xylenes(total) 278 050 " 30 0 92 7 70-130 <br /> Methyl tert-butyl ether 7 03 25 " 10 0 703 70-130 <br /> Surrogate a a,a-Trifluorotoluene 9 40 100 94 0 60-140 <br /> Sequoia 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 9 of 11 <br />