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41 <br /> 1455 McDowell Blvd,North Ste D _ <br /> P4Sequoia Petaluma,CA 94954 <br /> Analytical FAX D (707)792-1865 <br /> (707)792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P404664 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/17/04 14 05 <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 (P404664-01)Water Sampled 04/26/04 14 20 Received 04127104 14 35 <br /> Tert-amyl methyl ether ND 10 ug/l 1 4050190 05/10/04 05/10/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> D€-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-D€chloroethane 36 050 " <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 Dibromofluorom ethane 110% 84-122 " <br /> Surrogate 1 2-Duhloroethane-d4 117% 74-135 " <br /> Mrrogate Toluene-d8 106% 84-119 <br /> rrrogate 4-Bromofluorobenzene 101 % 86-119 " <br /> MW-2(P404664-02)Water Sampled 04/26/04 15 05 Received 04/27/04 14 35 <br /> Tert-amyl methyl ether ND 5 0 ug/l 5 4050190 05/10/04 05/10/04 EPA 8260B <br /> Benzene ND 25 " <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 5 0 " <br /> 1,2-Dibromoethane(EBB) ND 2 5 " <br /> 1,2-D€chloroethane 5 6 2 5 " <br /> Ethanol ND S00 " <br /> Ethylbenzene ND 2 5 " <br /> Ethyl tert-butyl ether ND 5 0 " <br /> Methyl tert-butyl ether 4 8 2 5 " <br /> Toluene ND 2 5 " <br /> Xylenes(total) 70 2 5 " <br /> Surrogate Dibromofluoromethane 104% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 115% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 99% 86-119 " <br /> Sequoia Analytical -Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> I <br /> Page 4 of 9 <br />