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1551 Industrial Road <br /> 70 <br /> 4D— Sequoia San Carlos(650)23299640 <br /> Analytical FAX(650)232.9612 <br /> www.sequoialabs.com <br /> Gettler-Ryan/GeostratCgies(1) Project: Tosco(l) f <br /> 6747 Sierra Court, Suite J 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 /> MW4(L711147-05)Water Sampled: 11/21/01 14:10 Received: 11/2110118:15 <br /> Ethanol ND 500 ug/1 1 1110104 11/29/01 11/29/01 EPA 8260B <br /> 1,2-Dibromoethane ND 1.0 " <br /> 1,2-Dichloroethane ND 1.0 " <br /> Di-isopropyl ether ND 1.0 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether 110 1.0 " <br /> Tert-amyl methyl ether ND 1.0 " <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate: 1,2-Dichloroethane-d4 102% 70-130 " <br /> Surrogate: Toluene-d8 102% 70-130 " <br /> MW-5(L111147-06)Water Sampled: 11/21/0115:45 Received: 11/21/01 18:15 - <br /> Ethanol ND 12000 ug/l 25 1110100 11/29/01 11/29/01 EPA 8260B <br /> 1,2-Dibromoethane ND 25 " <br /> 1,2-Dichloroethane ND 25 " <br /> Di-isopropyl ether ND 25 " <br /> Ethyl tert-butyl ether ND 25 <br /> Methyl tert-butyl ether 3300 25 " <br /> Tert-amyl methyl ether ND 25 " <br /> Tert-butyl alcohol ND 500 " <br /> Surrogate:1,2-Dichloroethane-d4 106% 70-130 " <br /> Surrogate: Toluene-d8 101 % 70-130 " <br /> MW-6(L111147-07)Water Sampled: 11/21/01_13:35 Received: 11/21/01 18:15 <br /> Ethanol ND 500 ugA 1 1110104 11/29/01 11/29/01 EPA 8260B <br /> 1,2-Dibromoethane ND 1.0 " <br /> 1,2-Dichloroethane ND 1.0 " <br /> Di-isopropyl ether ND 1.0 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether 4.7 1.0 " <br /> Ten-amyl methyl ether ND 1.0 " <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate;1,2-Dichloroethane-d4 103% 70-130 " <br /> Surrogate: Toluene-d8 98.8% 70-130 " <br /> Sequoia Analytical - San Carlos The results in this report apply to the samples analyed in accordance with the chain <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page 8 of 18 <br />