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Sequoia 1455 McDowell aNoah Ste <br /> Petaluma,CA 949544 <br /> a— ) (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs cam <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P312737 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/13/04 19 10 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> ATR-2(P312737-01)Water Sampled 12/24/03 11 45 Received 12/29/03 13 15 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 4010065 01/07/04 01/07/04 EPA 82608 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 ^ <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether 1 4 050 <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 106% 84-121 " <br /> . Surrogate 1 2-Dwhloroethane-d4 104% 74-135 " <br /> Surrogate Toluene-d8 101 % 84-119 " <br /> ATR-4(P312737-02)Water Sampled 12/24/03 11 15 Received 12/29/93 13 15 <br /> Tert-amyl methyl ether ND 1 0 u8/1 1 4010065 01/07/04 01/07/04 EPA 8260B <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 <br /> Ethyl tent-butyl ether ND 1 0 <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 <br /> Xylenes(total) ND 0 50 <br /> Surrogate Dibromofluoromelhane 109% 84-122 " <br /> Surrogate 1 1-Dichloroethane-d4 106% 74-135 " <br /> Surrogate Toluene-d8 99% 84-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> ofcustody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 4 of 10 <br />