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Sequoia 685 Jarvis Dr <br /> Ma�gin HiA,CA 95037 <br /> 'W (408)772-9 <br /> Analytical <br /> FAX(408)782-6348 <br /> www sequoialabs corn <br /> Secor-Rancho Cordova Project ARCO#4932,Stockton,CA MLK0836 <br /> 3017 Kilgore Rd Suite 100 Project Number ARCO#4932,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/20/02 08 11 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2K26031 -EPA 5035 <br /> Blank(2K26031-BLKI) Prepared 11/26/02 Analyzed 11/27/02 <br /> Ethanol ND 40 ug/kg <br /> ter(-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl cert butyl ether ND 050 " <br /> tent-Amy]methyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2 Dibromoethane(EDB) ND 050 " <br /> Benzene ND 0 50 " <br /> Toluene ND 050 " <br /> Ethylbenzetie ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Gasoline Range Organics(C6-C10) ND 100 " <br /> Ourrogate 12-Dichloroethane-d4 464 500 928 60-140 <br /> Laboratory Control Sample(2K26031-BSI) Prepared 11/26/02 Analyzed 11/27/02 <br /> Methyl Cert butyl ether 121 050 ug/kg 10 0 121 60-140 <br /> Benzene 104 0 50 100 104 60-140 <br /> Toluene 100 050 100 100 60-140 <br /> Surrogate 12-Dichloroethane-d4 4 84 500 968 60-140 <br /> Laboratory Control Sample(2K26031-BS2) _ Prepared 11/26/02 Analyzed 11/27/02 <br /> Methyl tett-butyl ether 785 050 ug/kg 840 93 5 60-140 <br /> Benzene 4 12 0 50 528 <br /> 780 60-140 <br /> Toluene 295 0 50 31 8 92 8 60-140 <br /> Gasoline Range Organics(C6-C 10) 341 100 440 <br /> 775 60-140 <br /> Surrogate 12-Dichloroethane-d4 489 500 978 60-140 <br /> Sequoia,Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 5 of 7 <br />