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t <br /> (D (919 19 <br /> Sequoia acrmnto Ave5te 83 <br /> Sacramento CA 45$34 <br /> iw Analytical <br /> 6)921 9100 <br /> FAX(916)921 010 <br /> www sequolalabs com <br /> SECOR International-Rancho Cordova Project TOSCO 1 1193, Stockton,CA 5304255 <br /> 3017 Kilgore Road,Suite 100 Project Number NIA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/29/03 08 52 <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-4(S304255-04)Water Samnled 04/07/03 14.51 Received,04/09/03 17.20 _ <br /> Tert-butyl alcohol _ ND 100 ug/l 1 3040319 04/18/03 04/18/03 EPA 8260B <br /> Methyl tert-butyl ether 14 2 0 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Ethanol ND 500 " <br /> 1,2-Dichloroethane ND 20 " <br /> 1,2-Dibromoethane(EDB) ND 20 <br /> Surro,eate 12-DCA-d4 118% 60-140 " <br /> MW-5(S304255-05)Water Sampled 04/07/03 12 11, Received 04/09/03 17 20 <br /> Tert-butyl alcohol 310 r 100 ug/1 1 3040335 04/21/03 04/21/03 EPA 8260B <br /> Methyl tert-butyl ether 14 20 " <br /> Di-isopropyl ether f ND 20 " <br /> Ethyl tent-butyl ether ND 20 <br /> Tert-amyl methyl ether ND 20 <br /> Ethanol ND 500 " <br /> 1,2-Dichloroethane_ - --_ ND- _-20 <br /> 1,2-Dibromoethane(EDB) ND 20 " <br /> SurroQare!2=DCA-zd4 119 Yd--60z-140 <br /> »� " <br /> MW-6(5304255-06)Water Sampled 04/07/03 1138 Received 04/09/03 17 20 - <br /> Tert-butyl alcohol ND 100 ugfl 1 3040319 04/18/03 04/18/03 EPA 8260B <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Ethanol ND 500 " <br /> 1,2-Dichloroethane ND 20 " <br /> 1,2-Dibromoethane(EDB) ND, 20 " <br /> Surrokate 1 2-DCA-d4 128% 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 staled results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 8 of 19 <br />