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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> ,X� (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs cola <br /> i <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P411364 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/04/04 14 40 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reportmg <br /> Analyte Result Iumt Units Dilution Batch Prepared Analyzed Method Note <br /> MW-5(P411364-01)Water Sampled 11/12/04 14 00 Received 11/15/04 12 57 <br /> Tert-amyl methyl ether ND 10 ugA 1 4110669 11/26/04 11/26/04 EPA 8260D <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 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 Dibromofluoromethane 119% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 117% 74-135 " <br /> Surrogate 7'oluene-d8 117% 84-1I9 " <br /> Surrogate 4-Bromofluoroben7ene 127% 86-119 LH <br /> MW-6(P411364-02)Water Sampled 11/12/0413 45 Received 11/15/04 12 57 <br /> Tert-amyl methyl ether ND 10 ugli I 4110669 11/26/04 11/26/04 EPA 8260B <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 ND 050 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tent-butyl ether 6 4 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 108% 84-122 " <br /> Surrogate 1 2-Dtchloroethane-d4 102% 74-135 " <br /> Surrogate Toluene-d8 114% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 137% 86-119 LH <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 7 of 19 <br />