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i <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> a (747)792-0342 <br /> a FAX ra www sequoialabs cam <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P310474 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 11/04/03 11 41 <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-1 (P310474-01)Water Sampled 10/17/03 08 50 Received 10/20/03 09 30 <br /> Tert-amyl methyl ether ND 10 ug/1 1 3100786 10/30/03 10/30/03 EPA 8260B <br /> Benzene ND 050 11 <br /> " " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane 50 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 055 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofiuoromethane 122% 84-122 " <br /> Wwrrogate 12-Dichloroethane-d4 108% 74-135 <br /> rogate Toluene-d8 104% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 106% 86-119 " <br /> MW-2(P310474-02)Water Sampled 10/17/03 09 15 Received 10/20/03 09 30 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3100829 10/31/03 10/31/03 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane 10 050 <br /> Ethanol ND 100 " " " " <br /> Ethylbenzene ND 050 " " <br /> Ethyl Cert-butyl ether ND 1 0 " It " <br /> Methyl tert-butyl ether 3 0 050 <br /> Toluene ND 050 " <br /> Xylenes(total) 066 050 " <br /> Surrogate Dibromofluoromethane 107% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 120% 74-135 " <br /> Surrogate Toluene-d8 107% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 116% 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 /> is basis This analytical report must be reproduced in its entirety <br /> Page 4 of I I <br />