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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> a— ) (707)792-1865Analytical FAX <br /> (707)792-6342 <br /> www sequoialabs aom <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 /> Reporting <br /> An Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-I1 (P411364-07)Water Sampled 11/12/04 14 20 Received 11/15/04 12 57 <br /> Tert-amyl methyl ether ND 10 ugll 1 4110669 11/26/04 11/26/04 EPA 8260E <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-Dtchloroethane ND 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 Dibromofluoromethane 119% 84-122 " <br /> Surrogate 1,2-Dtchloroethane-d4 121 % 74-135 " <br /> Surrte Toluene-d8 118% 84-119 " <br /> *--'I'95ate 4-Bromofluorobenzene 135% 86-119 LH <br /> MW-12(P411364-08)Water Sampled 11/12/04 10 35 Received 11/15/04 12 57 <br /> Tert-amyl methyl ether ND 10 ugA 1 4110667 11/16/04 11/26/04 EPA 8260B <br /> Benzene ND 050 " <br /> Ten-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dtchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 0 50 " <br /> Xylcnes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 100% 84-122 " <br /> Surrogate 1,2-Dtchloroethane-d4 102% 74-135 <br /> Surrogate Toluene-d8 103% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 111% 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 /> Thos analytical report must be reproduced to its entirety <br /> Page 10 of 19 <br />