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1455 McDowell Blvd North Ste <br /> a— ) Sequoia Petaluma CA 949544 <br /> (707)792 1865 <br /> Analytical FAX(707)792 0342342 <br /> www sequoialabs cam <br /> 4b <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P503196 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/25/05 17 38 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyto Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-2(P503196-01)Water Sampled 03/15/05 06 14 Received 03/15/05 12 30 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 5030210 03/21/05 03/21/05 EPA 8260E <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Dr-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dichloroethane ND 0 50 " <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 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Drbromofluoromethane 97% 84-122 " <br /> rrogate 1 2-Drchloroethane-d4 93% 74-135 " <br /> rrogate Toluene-d8 98 V. 84-119 <br /> Surrogate 4-Bromofluorobenzene 103% 86-119 " <br /> MW-8(P503196-02)Water Sampled 03/15/05 05 42 Received 03/15/05 12 30 <br /> Tert-amyl methyl ether ND 100 ugA 100 5030210 03/21/05 03/21/05 EPA 8260B <br /> Benzene ND 50 " <br /> Tert-butyl alcohol ND 2000 " <br /> Di-isopropyl ether ND 100 " <br /> 1,2-Dibromoethane(EDB) ND 50 " <br /> 1,2-Drchloroethane 70 50 " <br /> Ethanol ND 10000 " <br /> Ethylbenzene ND 50 " <br /> Ethyl tert-butyl ether ND 100 " <br /> Methyl tett-butyl ether ND 50 " <br /> Toluene ND 50 " <br /> Xylenes(total) 6100 50 " <br /> Surrogate Dibromofluoromethane 88% 84-122 " <br /> Surrogate 1,2-Drchloroethane-d4 91 % 74-135 " <br /> Surrogate Toluene-d8 91 % 84-119 <br /> Surrogate 4-Bromofluorobenzene 94% 86-119 " <br /> Sequoia Analytical-Petaluma The results to 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 5of18 <br />