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1455 McDowell Blvd,North Ste D <br /> u Sequoia Petaluma CA 94954 <br /> (707)792 1865865 <br /> Analytical FAX Doi 792 0342 <br /> www sequoialabs com <br /> • <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P406422 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 07/15/04 10 23 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Aeportuig <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-2(P406422-02)Water Sampled 06/22/04 06 27 Received 06/22/04 12 15 <br /> Surrogate Toluene-d8 112 % 84-119 4070035 07102104 07/02/04 EPA 8260B <br /> Surrogate 4-Bromofluorobenzene 116% 86-119 <br /> MW-10(P406422-03)Water Sampled 06/22/04 06 51 Received 06/22/04 12 15 <br /> Tert-amyl methyl ether ND 250 ug/l 250 4070035 07/02/04 07/02/04 EPA 8260E <br /> Benzene 4400 120 <br /> Tert-butyl alcohol ND 5000 " <br /> Di-isopropyl ether ND 250 " <br /> 1,2-Dibromoethane(EDB) ND 120 " <br /> 1,2-Dichloroethane ND 120 " <br /> Ethanol ND 25000 " <br /> Ethylbenzene 630 120 " <br /> Ethyl tert-butyl ether ND 250 " <br /> Methyl tert-butyl ether ND 120 " <br /> 40luene 7900 120 <br /> 1enes (total) 12000 120 " <br /> Surrogate Dibromofluoromethane 88% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 87% 74-135 " <br /> Surrogate Toluene-d8 92% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 94% 86-119 " <br /> MW-12(P406422-04)Water Sampled 06/22/04 07 28 Received 06/22/04 12 15 <br /> Tert-amyl methyl ether ND 1000 ug/l 1000 4070035 07/02/04 07/02/04 EPA 9260B <br /> Benzene 10000 500 <br /> Tert-butyl alcohol ND 20000 " <br /> Di-isopropyl ether ND 1004 " <br /> 1,2-Dtbromoethane(EDB) ND 500 " <br /> 1,2-Dichloroethane ND 500 " <br /> Ethanol ND 100000 " <br /> Ethylbenzene 1900 500 " <br /> Ethyl tert-butyl ether ND 1000 " <br /> Methyl tert-butyl ether ND 500 " <br /> Toluene 19000 500 " <br /> Xylenes(total) 13000 500 <br /> Surrogate Dibromofluoromethane 102% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 102% 74-13-5 " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 107% 86-119 <br /> uoia 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 6 of 18 <br />