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Blvd North Ste D <br /> Sequoia 1455 McDowPetaluma CA 49544 <br /> (707)792-1865 <br /> r Analytical FAX(707)792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P402493 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/17/04 15 30 <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 /> B39-95(P402493-06RE1)Soil Sampled 02/17/04 17 20 Received 02/19/04 10 00 <br /> Benzene 021 020 mg/kg 100 4030069 03/02/04 03/02/04 EPA 82608 <br /> Surrogate Dibromofluoromethane 98% 81-126 PEST <br /> Surrogate 1,2-Dichloroelhane-d4 95% 73-131 PESI <br /> Surrogate Toluene-d8 103% 82-129 PES] <br /> B39-107(P402493-07)Soil Sampled 02/18/04 09 55 Received 02/19/04 10 00 <br /> Tert-amyl methyl ether ND 10 mg/kg 100 4030015 03/01/04 03/01/04 EPA 8260B <br /> Benzene ND 10 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 1 0 " <br /> 1,2-Dtchloroethane ND 1 0 " <br /> Ethanol ND 40,ik " <br /> ylbenzene ND 10 " <br /> l tent-butyl ether ND 10 " <br /> ethyl tert-butyl ether ND 10 " <br /> Toluene ND 10 " <br /> Xylenes(total) 048 040 " <br /> Surrogate Dibromofluoromethane 98% 81-126 " <br /> Surrogate 12-Dtchloroethane-d4 94% 73-131 " <br /> Surrogate Toluene-d8 91 % 82-129 " <br /> B39-107(P402493-07RE1)Sod Sampled 02/18/04 09 55 Received 02/19/04 10 00 HT-05 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4030433 03/16/04 03/16/04 EPA 9260B <br /> Benzene 014 00050 " <br /> Tert-butyl alcohol ND 010 " <br /> Di-isopropyl ether ND 00050 " <br /> 1,2-Dtbromoethane(EDB) ND 00050 " <br /> 1,2-Dtchloroethane ND 00050 " <br /> Ethanol ND 020 " <br /> Ethylbenzene ND 00050 " <br /> Ethyl ter -butyl ether ND 00050 " <br /> Methyl tert-butyl ether ND 00050 " <br /> Toluene 017 00050 " <br /> Xylenes(total) 019 00050 " <br /> Surrogate Dibromofluoromethane 111 % 81-126 " " " " <br /> Surrogate 12-Dichloroethane-d4 108% 73-131 <br /> �oia Analytical-Petaluma The results rn 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 9 of 25 <br />