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S <br /> ]455 McDow <br /> Sequoia Petaluma,CA 94954 <br /> ell Blvd,North Ste 4a— ) (707) 4 <br /> Analytical FAX 7921865 <br /> 707)792-0342 <br /> www sequoialabs 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 Prepared Analyzed Method Notes <br /> MW-6(P312071-02RE1)Water Sampled 11/16/03 13 20 Received 12/01/03 15 21 <br /> Methyl tert-butyl ether 170 5 0 ugA 10 3120274 12/10/03 12/10/03 EPA 8260B <br /> Surrogate Dibromofluoromethane 108% 84-122 " <br /> Surrogate 1,2-Drchloroethane-d4 106% 74-135 " <br /> Surrogate Toluene-d8 113% 84-119 " <br /> Surrogate 4-BromoJluorobenzene 111 % 86-119 " <br /> MW-7(P312071-03)Water Sampled 11/26/0313 50 Received 12/01/03 15 21 <br /> Tert-amyl methyl ether ND 1 0 ugA 1 3120260 12/09/03 12/10/03 EPA 82608 <br /> Benzene ND 050 " " 11 " " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 104 " <br /> hylbenzene ND 050 1, 11 <br /> hyl Cert-butyl ether ND 10 " <br /> ethyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 100% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 100% 74-135 " <br /> Surrogate Toluene-d8 102% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 100% 86-119 " <br /> MW-8(P312071-04)Water Sampled 11/26/03 14 40 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 0 50 " <br /> 'Pert-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 0 50 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 97% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 96% 74-135 " <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 8 of 17 <br />