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1455 McDowell Blvd,North Ste D <br /> 1:1) Sequoia Petaluma,CA 94954 <br /> (707)'192-1865 <br /> Analytical FAX(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 lntnm-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 Analyhcal-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-11 (P312071-n Water Sampled 11/26/03 14 15 Received 12/01/03 15 21 <br /> Tert-amyl methyl ether ND 10 ug/I 1 3120260 12/09/03 12/10/03 EPA 8260B <br /> Benzene ND 050 " <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 073 050 <br /> Xylenes(total) 054 050 " <br /> Surrogate Dibromofluoromethane 104% 84-112 " <br /> Surrogate 1 2-Dichloroethane-d4 100% 74-135 " <br /> 10rrogate Toluene-d8 104% 84-119 <br /> urrogate 4-BromoJluorobenzene 99% 86-119 <br /> MW-12(P312071-08)Water Sampled 11/26/03 12 20 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 <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 1 0 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate DibromoJluoromethane 108% 84-121 " <br /> Surrogate 12-Dichloroethane-d4 106% 74-135 " <br /> Surrogate Toluene-d8 99% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 101 % 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 /> 0 basis This analytical report must be reproduced in its entirety <br /> Page 10 of 17 <br />