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4 <br /> Gettler-Ryan/Geostrategies(1) Project: Tosco(1) <br /> 6747 Sierra Court,Suite J Project Number: Tosco#11195,Lathrop,CA Reported- <br /> Dublin CA,94568 Project Manager: Deanna Harding 05/25/01 14:01 <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-4(L105110-05)Water Sampled:0511110115:40 Received:05/11/01 18:45 <br /> Ethanol ND 1000 U94 1 1050076 05/17/01 05/18/01 EPA 8260B <br /> 1,2-Dibromoethane ND 2.00 11" <br /> 1,2-Dichloroethane ND 2.00 It <br /> Di-isopropyl ether ND 2.00 <br /> Ethyl tert-butyl ether ND 2.00 <br /> Methyl tent-butyl ether 12.8 2.00 <br /> Tent-amyl methyl ether ND 2.00 <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate:1,2-Dichloroethane-d4 91.8% 76-114 " <br /> Surrogate:Toluene-d8 101 % 88-110 " <br /> MW-5(L105110-06)Water Sampled:05/11/0116:15 Received:0511110118:45 <br /> Ethanol ND 25000 ug/1 25 1050076 05/17/01 05/18/01 EPA 8260E <br /> 1,2-Dibromoethane ND 50.0 <br /> 1,2-Dichloroethane ND 50.0 " <br /> Di-isopropyl ether ND 50.0 " <br /> Ethyl tert-butyl ether ND 50.0 <br /> Methyl Cert-butyl ether 3890 50.0 <br /> Tert-amyl methyl ether ND 50.0 <br /> Tert-butyl alcohol ND 2500 " <br /> Surrogate:1,2 Dichloroethane-d4 92.4% 76-114 " <br /> Surrogate:Toluene-d8 102% 88-110 " <br /> MW-6(L105110-07)Water Sampled:05/11/0113:55 Received:05/11/0118:45 <br /> Ethanol ND 1000 ug/l 1 1050074 05/18/01 05/18/01 EPA 8260B <br /> 1,2-Dibromoethane ND 2.00 <br /> 1,2-Dichloroethane ND 2.00 " <br /> Di-isopropyl ether ND 2.00 <br /> Ethyl tert-butyl ether ND 2.00 ' <br /> Methyl tert-butyl ether 5.29 2.00 <br /> Tert-amyl methyl ether ND 2.00 " <br /> Tert-butyl alcohol ND 100 <br /> Surrogate:1,2-Dichloroethane-d4 88.0% 76-114 n " <br /> Surrogate:Toluene-d8 101 % 88-110 <br /> Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the c&i. xif <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page 8 of 20 <br />