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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (1) (707)792-1865 <br /> Analytical <br /> FAX(707)742-0342 <br /> . www.sequoialabs.com <br /> URS Corn-Sacramento Project: Arco Site 5469,Stockton,CA P312283 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 01/12/04 18:12 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-9(P312283-09RE1)Water Sampled: 12/10/03 04:13 Received: 12/10/03 10:42 HT-04 <br /> Di-isopropyl ether ND 1.0 ugll 1 4010084 01/07/04 01/08/04 EPA 8260B <br /> 1,2-Dichloroethane 2.6 0.50 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Surrogate:Dibromofluoromethane 106% 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 106% 74-135 " <br /> Surrogate: Toluene-d8 102% 84-119 <br /> Surrogate:4-Bromofluorobenzene 104% 86-119 <br /> MVV-10(P312283-10)Water Sampled: 12/10/03 05:11 Received: 12/10/03 10:42 <br /> Tert-amyl methyl ether ND 1.0 ug/1 1 3120679 12/23/03 12/24/03 EPA 8260B <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND LO " <br /> 2-Dibromoethane(EDB) ND 0.50 " <br /> .2-Dichloroethane 1.3 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 <br /> Ethyl tent-butyl ether ND 1.0 <br /> Methyl tert-butyl ether 320 0.50 E <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 102% 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 100% 74-135 " <br /> Surrogate: Toluene-d8 89% 84-119 " <br /> Surrogate:4-Bromofuorobenzene 94% 86-119 lo " <br /> equoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise stated, results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 19 of 40 <br />