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1551 Industnal Road <br /> 4:9� Sequoia San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX(650)2329612 <br /> www sequoialabs com <br /> ler-Ryan/GcostrateRies(1) Project Tosco(1) <br /> 7 Sierra Court,Suite J Project Number Tosco#/01205(Circle K),Lathrop,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 02/14/02 12 09 <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-7(L201127-08)Water Sailed 01/29/02 15 40 Received 01/30/02 08 55 R-05 <br /> Ethanol ND 8300 ug/1 16 67 2020001 02/01/02 02/01/02 EPA 8260B <br /> 1,2-Dibromoethane ND 33 " " " " '. <br /> 1,2-Dlchloroethane ND 33 " <br /> Di-isopropyl ether ND 33 <br /> Ethyl tert-butyl ether ND 33 <br /> Methyl tert-butyl ether ND 33 <br /> Tert-amyl methyl ether ND 33 <br /> Tert-butyl alcohol ND 1700 <br /> Surrogate 1,2-Dlchloroethane-d4 100% 70-130 " " " IF <br /> Surrogate Toluene-d8 964% 70-130 IF " IF <br /> MW-8(L201127-09)Water Sampled 01/29/02 10 55 Received 01/30/02 08 55 - - <br /> Ethanol ND 500 ug/1 1 2020001 02/01/02 02/01/02 EPA 8260B <br /> 1,2-Dibromoethane ND 20 " " ^ ° '. „ <br /> 1,2-Dichloroethane ND 20 " <br /> propyl ether ND 2 0 <br /> gKo <br /> tert-butyl ether ND 20 <br /> " <br /> ethyl tert-butyl ether ND 20 <br /> Tert-amyl methyl ether ND 20 " " IF <br /> Tert-butyl alcohol ND 100 IF " " <br /> Surrogate 1,2-Dichloroethane-d4 110% 70-130 IF IF IF <br /> Surrogate Toluene-d8 984% 70-130 " " IF <br /> MW-9(L201127-1 0)Water Sampled 01/29/02 14 35 Received 01/30/02 08 55 <br /> Ethanol ND 3100 ug/1 625 2020001 02/01/02 02/01/02 EPA 8260E <br /> 1,2-Dibromoethane ND 12 <br /> 1,2-Dlchloroethane ND 12 <br /> Di-isopropyl ether ND 12 IF <br /> Ethyl tert-butyl ether ND 12 IF <br /> " <br /> Methyl tert-butyl ether ND 12 <br /> Tert-amyl methyl ether ND 12 <br /> Tert-butyl alcohol ND 620 <br /> Surrogate 1,2-Dichloroethane-d4 100% 70-130 11 IF " <br /> Surrogate Toluene-d8 958% 70-130 " IF <br /> 1�ia Analytical -San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical repoi t must be reproduced in its entirety <br /> Page 8 of 1 l <br />