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1455 McDowell Blvd North Ste D <br /> yse(lluQia Petaluma CA 94954 <br /> �h (707)792-1865 <br /> Analytical FAX(707) 42 <br /> www sequoialalabs bs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P404354 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number G09JZ-0307 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/28/04 16 54 <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 /> vwA BH-1-40(P404354-06)Soil Sampled 04/13/04 09 45 Received 04/14/04 10 30 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4040558 04/22/04 04/22/04 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-Dtchloroethane 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 Dibromofluoroin ethane 103% 81-116 " <br /> 4rrogate 12-Dichloroethane-d4 102% 73-131 <br /> rrogate Toluene-d8 106% 81-119 <br /> P � BH-2-50(P404354-12)Soil Sampled 04/13/04 13 25 Received 04/14/04 10 30 <br /> Tert-amyl methyl ether 0 013 00050 mg/kg 1 4040558 04/22/04 04/22104 EPA 8260B <br /> Benzene ND 00050 " <br /> Tert-butyl alcohol 026 0 10 " <br /> Dl-isopropyl ether ND 00050 " <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> 1,2-Dtchloroethane ND 00050 " <br /> Ethanol ND 020 " <br /> Ethylbenzene ND 00050 " <br /> Ethyl tert-butyl ether ND 00050 " <br /> Toluene ND 00050 " <br /> Xylenes(total) ND 00050 " <br /> Surrogate Dtbromofluoromethane 104% 81-126 <br /> Surrogate 12-Dtchloroethane-d4 102% 73-131 <br /> Surrogate Toluene-d8 105% 82-129 <br /> Sequoia Analytical -Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 5 of 13 <br />