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t1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> C- 4 <br /> (707)792 18b5 <br /> iAnalytical PAXequoi792.0342 <br /> www sequoialabs wm <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 /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-13D-20(P307344-10)Soil Sampled 07/15/03 13 40 Received 07/16/03 13 45 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 3070564 07/26/03 07/27/03 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 tcrt-butyl ether ND 00050 " <br /> Toluene ND 00050 <br /> Xylenes(total) ND 00050 " <br /> urrogate Dibromo luoromethane 106% 81-126 " <br /> rrogate I2-D[chloroethane-d4 101 % 73-131EW " <br /> Surrogate Toluene-d8 113% 82-129 " <br /> �, Sequoia Analytical-Petaluma The resalts in this report apply 10 the samples analyzed rn accordance with the chain <br /> . of custody document Unless otherwise stated resuhs are reported on a wet weight <br /> bass This analytical report must be reproduced in its ent[refy <br /> Page 8 of 14 <br />