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DSequoia 1455 McDowell North Ste D <br /> - Petaluma CA 94954 <br /> Analytical (707)792 1865 FAX(707)792-0342corn www seqequoiuoialabs cam <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P404555 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/13/04 18 04 <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 /> B42-122(P404555-08)Sod Sampled 04/2I/04 15 10 Received 04/23/04 11 50 <br /> Tert-amyl methyl ether ND 00050 mg/kg l 4050057 05/04/04 05/04/04 EPA 8260B <br /> Benzene ND 00050 <br /> Tert-butyl alcohol ND 0 t0 <br /> Da-isopropyt ether ND 00050 <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> 1,2-Dichloroethane ND 00050 <br /> Ethanol ND 020 " <br /> Ethylbenzene ND 00050 <br /> Ethyl tert-butyl ether ND 00050 " <br /> Methyl tert-butyl ether ND 00050 <br /> Toluene ND 00050 " <br /> Xylenes(total) ND 00050 " <br /> Surrogate Dibrotno luoromethane 99% 81-126 <br /> W <br /> urrogate 1 2-Dichloroethane-d4 97% 73-131 <br /> urrogate Toluene-d8 100% 82429 <br /> B42-132(P404555-09)Soil Sampled 04/21/04 15 50 Received 04/23/04 11 50 <br /> Tert-amyl methyl ether ND 00050 mg/kg l 4050057 05/04/04 05/04/04 EPA 8260B <br /> Benzene ND 00050 <br /> Tert-butyl alcohol ND 0 10 <br /> Di-isopropyl ether ND 00050 " <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> 1,2-Dichloroethane ND 00050 " <br /> Ethanol ND 020 " <br /> Ethylbenzene ND 00050 " <br /> Ethyl tert-butyl ether ND 00050 <br /> Methyl tert-butyl ether ND 00050 <br /> Toluene ND 00050 <br /> Xylenes(total) ND 00050 " <br /> Surrogate Dtbromofluoromethane 101 % 81-126 " <br /> Surrogate 12-Dichloroethane-d4 104% 73-131 <br /> Surrogate Toluene-d8 98% 82-129 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody ducument Unless otherwise stated results are reported on a wet weight <br /> 0 basis This analytical report must be reproduced in its entirety <br /> Page 9 of 18 <br />