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Sequoia 1551 Industrial Road <br /> San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX(650)232-9612 <br /> wwwsequoialabscom <br /> #r ;filer-Ryan/Geostrategies(1) Project: Tosco(1) <br /> :A7 Sierra Court,Suite 7 Project Number: Tosco#11195,Lathrop,CA Reported: <br /> Dublin CA,94568 Project Manager: Deanna Harding 12/10/01 19:11 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyte Result Limit units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1 (LI 11147-02)Water Sampled. 1 1/21101 15-15 Received: 11/21/01 18:15 <br /> Ethanol ND 5000 ug/1 10 1110089 11/28/01 11/28/01 EPA 8260B <br /> 1,2-Dibromoethane ND 10 " <br /> 1,2-Dichloroethane ND 10 <br /> Di-isopropyl ether ND 10 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether 2000 10 " <br /> Tert-amyl methyl ether ND 10 " <br /> Tert-butyl alcohol ND 200 " <br /> Surrogate.-1,2-Dichloroethane-&' ___ _ -- 106% -'-70=130-- " <br /> Surrogate_ Toluene-d8 101 % 70-130 ' <br /> MW-2(LI11147-03)Water Sampled: 11121_/0l 14:45 Received: 11/21/01 18:15 <br /> Ethanol ND - 560 ugh 1.11 1110104 11/29/01 11/29/01 EPA 8260B <br /> 1,2-Dibromoethane ND 1.1 <br /> 1.2-Dichloroethane ND I.1 " <br /> P; • opropyl ether ND 1.1 " " " or <br /> or <br /> S 4ert-butyl ether ND 1.1 <br /> Methyl tert-butyl ether 130 1.1 " <br /> Tert-amyl methyl ether ND , 1.1 <br /> Tert-butyl alcohol ND 22 <br /> Surrogate: 1,2-Dichloroethane-d4 83.6% 70-130 or " <br /> Surrogate: Toluene-d8 96.0% 70-130 or " " <br /> MW-3 L111147-04 Water Sampled: 11/21/0116:15 Received: 11/21/0118:15 <br /> Ethanol ND 20000 ugll 40 1110089 11/28/01 11/28/01 EPA 8260B <br /> 1,2-Dibromoethane ND 40 " <br /> 1,2-Dichloroethane ND 40 " <br /> Di-isopropyl ether ND 40 " <br /> Ethyl tert-butyl ether ND 40 " <br /> Methyl tert-butyl ether 5500 40 " <br /> Ten-amyl methyl ether ND 40 " <br /> Tert-butyl alcohol 980 800 " <br /> Surrogate: 1,2-Dichloroethane-d4 104% 70-130 " <br /> Surrogate: Toluene-d8 99.6% 70-130 " <br /> S �ia Analytical- San Carlos -1The results in this repoapply to the samples analyzed in accordance with the chain of <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page 7 of 18 <br />