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4� <br /> 1455 McDowell Blvd North Ste D <br /> Ci Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> �� Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P410096 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/20/04 17 30 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit UmtS Dilution Batch Prepared Analyzed Method Note <br /> MW-1 (P410096-01)Water Sampled 10/04/04 17 10 Received 10/05/04 18 00 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 4100304 10/13/04 10/13/04 EPA 8260B <br /> Benzene ND 050 " <br /> Teri-butyl alcohol ND 20 " <br /> Di-Isopropyl ether ND 10 " <br /> 1,2-Dlbromoethane(EDB) ND 050 " <br /> 1,2-Dtchloroethane 23 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl terl-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 104% 84-122 " <br /> 6rrogate 1,2-Dtchloroethane-d4 109% 74-135 <br /> rrogate Toluene-d8 119% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 105% 86-119 " <br /> MW-2(P410096-02)Water Sampled 10/04/04 17 25 Received 10/05/04 18 00 <br /> Tert-amyl methyl ether ND 20 ug/I 2 4100375 10/15/04 10/15/04 EPA 8260E <br /> Benzene ND 10 " <br /> Tert-butyl alcohol ND 40 " <br /> DI-Isopropyl ether ND 20 " <br /> 1,2-Dlbromoethane(EDB) ND 1 0 " <br /> 1,2-Dtchloroethane 21 10 " <br /> Ethanol ND 200 " <br /> Ethylbenzene ND 10 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether 1 1 10 " <br /> Toluene ND 10 " <br /> Xylenes(total) 69 10 <br /> Surrogate Dibromofluoromethane 98% 84-122 " <br /> Surrogate 1 2-Dtchloroethane-d4 89% 74-135 " <br /> Surrogate Toluene-d8 107% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 114% 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 /> Page 4 of 11 <br />