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(D (701455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> r Analytical FAX <br /> 7)792-1665 <br /> (707)792-0342 <br /> www sequoialabs coni <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P307501 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 08/11/03 13 44 <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(P307501-01)Water Sampled 07/24/03 09 55 Received 07/25/03 12 35 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3070681 07/31/03 07/31/03 EPA 82608 <br /> Benzene ND 050 " " " " " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichloroethane 13 050 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 076 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> .Surrogate Drbromofluoromethane 120% 84-122 " <br /> 0urrrogate 1,2-Dichloroethane-d4 112% 74-135 " <br /> rogate Toluene-d8 101 % 84-119 " <br /> Surrogate 4-Bromofluorobenzene 88% 86-119 " <br /> MW-2(P307501-02)Water Sampled 07/24/03 10 20 Received 07/25/03 12 35 <br /> Tert-amyl methyl ether ND 20 ug/1 2 3070681 07/31/03 07/31/03 EPA 9260B <br /> Benzene 22 10 " " " " " <br /> Tert-butyl alcohol ND 40 It " " " " <br /> Di-isopropyl ether ND 20 <br /> 1,2-Dibromoethane(EDB) ND 10 " <br /> 1,2-Dichloroethane 20 10 <br /> Ethanol ND 200 " <br /> Ethylbenzene ND 10 " <br /> Ethyl tert-butyl ether ND 20 <br /> Methyl tert-butyl ether 63 10 " <br /> Toluene ND 10 <br /> Xylenes(total) 2 9 10 " <br /> Surrogate Dibromofluoromethane 114% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 105% 74-135 " <br /> Surrogate Toluene-& 110% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 99% 86-119 " <br /> Sequoia Analytical-Petaluma The resulls 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 4 of 9 <br />