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4D (707) <br /> 1A55 McDowell Blvd.North Ste D <br /> Sequoia Petaluma,CA 94954 y 792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P312071 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/22/03 13 18 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Pmpared Analyzed Method Notes <br /> MW-8(P312071-04)Water Sampled 11/26/03 14 40 Received 12/01/03 15 21 <br /> Surrogate Toluene-d8 102% 84-119 3120160 12109103 12110103 EPA 8260B <br /> Surrogate 4-BromoJluorobenzene 97% 86-119 " <br /> MW-9(P312071-05)Water Sampled 11/26/03 14 30 Received 12/01/03 15 21 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3120260 12/09/03 12/10/03 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 It <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> 1ylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 99% 84-122 <br /> Surrogate 1,2-Dichloroelhane-d4 99% 74-135 " <br /> Surrogate Toluene-d8 102% 84-119 <br /> Surrogate 4-Bromoluorobenzene 103% 86-119 " <br /> MW-10(P312071-06)Water Sampled 11/26/03 14 00 Received 12/01/03 15 21 <br /> Tert-amyl methyl ether ND 10 ugA 1 3120260 12/09/03 12/10/03 EPA 8260B <br /> Benzene ND 050 " It It " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromonuoromethane 102% 84-122 " <br /> Surrogate 1,1-Dichloroethane-d4 101 % 74-135 <br /> Surrogate Toluene-d8 100% 84-119 " <br /> Surrogate 4-BromoJluorobenzene 98% 86-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 9 of 17 <br />