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l Blvd,North Ste D <br /> Sequoia 1455 McDowPetaaluma,CA 94954 <br /> ""`'� ►'"''"�' Analytical FAX(707;792 0342 <br /> www sequmalabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P404367 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09IZ-0307 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/05/04 17 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 /> BH-3-50(P404367-05)Soil Sampled 04/14/04 09 45 Received 04/15/04 10 00 <br /> Tert-amyl methyl ether �-0 0081> 00050 mg/kg 1 4040558 04/22/04 04/22/04 EPA 8260B <br /> Benzene ND 00050 " <br /> Tert-butyl alcohol �18 0 10 <br /> Di-isopropyl ether D 00050 <br /> 1,2-Dichloroethane 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 Dibromofluoromethane 108% 81-126 <br /> Surrogate 12-Dichloroethane-d4 104% 73-131 <br /> Surrogate Toluene-d8 106% 82-129 " <br /> AlftH-3-50(P404367-05RE1)Soil Sampled 04/14/04 09 45 Received 04/15/04 10 00 <br /> Methyl tert-butyl ether C (1_63/ 0 025 mg/kg 5 4040616 04/24/04 04/24/04 EPA 8260E <br /> Surrogate Dibromofluoromethane 102% 81-126 <br /> Surrogate 12-Dichloroethane-d4 96% 73-131 " <br /> Surrogate Toluene-d8 106% 82-129 <br /> BH-3-97(P404367-07)Soil Sampled 04/14/04 12 50 Received 04/15/04 10 00 <br /> Tert-amyl methyl ether ND 00050 mg/kg 1 4040558 04/22/04 04/22/04 EPA 826013 <br /> Benzene ND 00050 " <br /> Tert-butyl alcohol ND 0 10 " <br /> Di-isopropyl ether ND 00050 " <br /> 1,2-Dichloroethane ND 00050 ` <br /> Ethanol ND 020 <br /> Ethylbenzene ND 00050 �� l <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 Dibromofluoromethane 110% 81-126 <br /> Surrogate 12-Dichloroethane-d4 II0% 73-131 " <br /> Surrogate Toluene-d8 107% 82-129 <br /> Sequoia Analytical -Petaluma The results in 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 Thrs analytical report must be reproduced in its entirety <br /> Page 5 of 12 <br />