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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> �*�"� (707)792-1665 <br /> Analytical FAX(707)792-0342 <br /> 10 www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P307344 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36616 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/28/03 16 58 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> JAnalyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-11-20(P307344-02)Soil Sampled 07/15/03 08 35 Received 07/16/03 13 45 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 3070531 07/24/03 07/25/03 EPA 8260B <br /> Benzene ND 00050 " <br /> Tert-butyl alcohol ND 010 <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 cert-butyl ether ND 00050 " <br /> Toluene ND 00050 <br /> Xylenes(total) ND 00050ga <br /> " <br /> Surrogate Dibromofluoromethane 96% 81-126 <br /> rrogate 12-Dichloroethane-d4 93% 73-131 " " <br /> Surrogate Toluene-& 103% 82-129 " <br /> MW-11-25(P307344-03)Soil Sampled 07/15/030840 Received 07/16/03 13 45 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 3070531 07/24/03 07/25/03 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 DibromoJluoromethane 98% 81-126 <br /> Surrogate 1 2-Dichloroethane-d4 97% 73-131 " <br /> Surrogate Toluene-d8 102% 82-129 " <br /> lequoia Analytical-Petaluma The results in this report apply!o the samples analyzed in accordance with the Chain <br /> of custody document Unless otherwise staled results are reported on a wet weight <br /> basis Thrs analytical reporl must be reproduced in its entirety <br /> Page 5 0f14 <br />