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fY <br /> Sequoia 1551 lndustnal <br /> 41) San Carlos CA 940704070 <br /> (650)232-9600 <br /> 1w -Analyticalwvsequotalabs9Corn <br /> Gettler-Ryan/Geostrategies(1) Project Tosco(1) <br /> 6747 Sierra Court,Suite 9 Project Number Tosco#01205(Circle K),Lathrop Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 11/1110109 26 <br /> Volatile Organic S 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(L204130-05)Water Sampled 04/29/02 11 25 Received 04/29/02 17 20 <br /> Ethanol ND 500 ug/l 1 2050009 05/06/02 05/06/02 EPA 8260B - <br /> 1,2-Dtbromoethane ND 2 0 <br /> 1,2-Dtchloroethane ND 2 Q " <br /> Di-isopropyl ether ND 2 0 <br /> Ethyl ten-butyl ether ND 2 0 " <br /> Methyl tert-butyl ether ND 2 0 " ^ <br /> Tert-amyl methyl ether ND 2 0 ^ <br /> Tert-butyl alcohol ND 100 <br /> Surrogate 1,1-Dichloroethane-d4 102% 70-130 " <br /> Surrogate Toluene-d8 956% 70-130 <br /> MW-5(L204130-06)Water Sampled 04/29/02 14 15 Received 04/29/02 17 20 R-05 <br /> Ethanol ND 25000 ug/1 50 2050009 05/06/02 05/06/02 EPA 8260B <br /> 1,2-Dibromoethane ND 100 <br /> 1,2-Dtchloroethane ND 100 " <br /> Di-isopropyl ether ND 100 <br /> Ethyl tert-butyl ether ND 100 ^ <br /> " <br /> Methyl tett-butyl ether ND 100 <br /> Tent-amyl methyl ether ND 100 <br /> Tert-butyl alcohol ND 5000 <br /> Surrogate 1,2-Dtchloroethane-d4 92 4 Yo 70-130 <br /> Surrogate Toluene-d8 98 4% 70-130 <br /> MW-6(L204130-07)Water Sampled 04/29/02 15 20 Received, 04_/29/02 17 20 _ <br /> Ethanol ND 1200 ugA 25 2050009 05/06/02 05/06/02 EPA 8260E <br /> 1,2-Dtbromoethane ND 5 0 <br /> 1,2-Dtchloroethane ND 5 0 <br /> Di-isopropyl ether ND 5 0 <br /> Ethyl tert-butyl ether ND 5 0 <br /> Methyl tent-butyl ether 310 5 0 <br /> Tert-amyl methyl ether ND 5 0 <br /> Tert-butyl alcohol ND 250 <br /> Surrogate 1,1-Dtchloroethane-d4 978% 70-130 <br /> Surrogate Toluene-d8 990% 70-130 <br /> Sequoia Analytical - an Carlos The results In this report <br /> � yt al S C .rrly to the samples ranwlyzed it,accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 7 of 14 <br />