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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> 12) (916)921 9600 <br /> Analytical FAX(916)92 1-0100 <br /> www sequoialabs com <br /> *-R International-Rancho Cordova Project ARCO 4493,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number 4493,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 05/24/02 16 48 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> W- 25'(S205153-01)Soil Sampled 05/08/02 09 04 Received,05/10102 1 4 <br /> Tert-butyl alcohol ND 0 050 mg/kg 1 2050142 05/14/02 05/14/02 EPA 82608 <br /> Methyl tert-butyl ether 0 020 00050 " " ^ <br /> Di-isopropyl ether ND 00050 " <br /> Ethyl tert-butyl ether ND 00050 <br /> Tert-amyl methyl ether ND 00050 <br /> 112-Dichloroethane ND 00050 <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> Surrogate 12-DCA-d4 86% 60-140 " <br /> MW-9 a,42' 5205153-02 Soli Sam led 05/08/02 09 38 Received 05/10/02 11 41 <br /> Tert-butyl alcohol ND 0 050 mg/kg 1 2050153 05/15/02 05/15/02 EPA 82603 <br /> Methyl tert-butyl ether 0 026 00050 " 11 " <br /> Di-isopropyl ether ND 00050 <br /> Ethyl tert-butyl ether ND 00050 " <br /> 0 Tert-amyl methyl ether ND 00050 <br /> ,2-Dichloroethane ND 00050 " <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> Surrogate 12-DCA-d4 98% 60-140 " <br /> MW-9(a-)52'(5205153-03)Soil Sampled 05/08/02 10 25 Received 05/10/02 11 41 <br /> Tert-butyl alcohol ND 0 050 mg/kg 1 2050153 05/15/02 05/15/02 EPA 8260B <br /> Methyl tert-butyl ether ND 00050 " <br /> Di-isopropyl ether ND 00050 " <br /> Ethyl tert-butyl ether ND 00050 " <br /> Tert-amyl methyl ether ND 00050 " <br /> 1,2-Dichlorocthane ND 00050 ^ " <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> Surrogate 12-DCA-d4 97% 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 4 of 9 <br />