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, E <br /> Sequoia acr Straker A958 B <br /> ve Ste <br /> Sacramcnta,CA 9S 834 <br /> (D (916)921 9600 <br /> Analytical FAX(916)9210100 <br /> WWW sequoialabs com <br /> • <br /> SECOR International-Rancho Cordova Project TOSCO 11193,Stockton,CA 5306625 <br /> 3017 Kilgore Road,Suite 100 Project Number NIA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/30/03 13 04 <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 /> MW-1R(S306625-01)Water Sampled 06/27/03 13 40 Received 06/30/0312 20 <br /> Tert-butyl alcohol 1500 100 u'g/l 1 3070157 07/11/03 07/11/03 EPA 8260B A-01 <br /> Di-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 " <br /> Tett-amyl methyl ether ND 2 0 " <br /> Ethanol ND 500 <br /> 1,2-Dichloroethane ND 2 0 <br /> 1,2-Dibromoethane(EDB) ND 20 <br /> Surrogate 1,2-DCA-d4 95% 60-140 " <br /> MW-2R(S306625-02)Water Sampled 06/27/0315 35 Received 06/30/03 12 20 <br /> Di-isopropyl ether ND 20 ug/1 10 3070157 07/11/03 07/11/03 EPA 8260E <br /> Ethyl tent-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Ethanol ND 5000 " <br /> 1,2-Dichloroethane ND 20 " <br /> 1,2-Dibromoethane(EDB) ND 20 " <br /> Surrogate 1,2-DCA-d4 93% 60-140 " <br /> MW-211(S306625-02RE1)Water Sampled 06/27/03 15 35 Received 06/30/03 12 20 <br /> Tert-butyl alcohol - - -33000`— - 10000 ug/l - 100 3070157 07/11/03 07/11/03 -EPA 8260E <br /> Surrogate 12-DCA-d4 - 102% 60-140 „ <br /> MW-3(S306625-03)Water Sampled 06/27/031430 Received 06/30/031220 <br /> Tert-butyl alcohol ND 100 ug/I 1 3070157 07/11/03 07/11/03 EPA 8260B <br /> Di-Isopropyl ether ND 2 0 " " <br /> Ethyl tert-butyl ether ND 2 0 " <br /> Tert-amyl methyl ether ND 20 " <br /> Ethanol ND 500 <br /> 1,2-Dichloroethane ND r 2 0 <br /> 1,2-Dibromoethane(EDB) ND 2 0 <br /> Surrogate 1,2-DCA-d4 93% 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 Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 8 of 18 <br />