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1455 McDowell Blvd North Ste D <br /> 4D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical 792-1865 <br /> FAX(747)792-0342 <br /> www sequalequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P402408 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/02/04 10 16 <br /> Volatile Organic Compounds by EPA Method 826OB <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-10(P402408-06)Water Sampled 02/16/04 12 50 Received 02/17/04 07 45 <br /> Surrogate Toluene-d8 96% 84-119 4020577 02/26104 02126104 EPA 8260E <br /> Surrogate 4-Bromofluorobenzene 105% 86-II9 " <br /> MW-10(P402408-06RE1)Water Sampled 02/16/04 12 50 Received 02/17/04 07 45 <br /> Ethanol 430 100 ug/l 1 4020577 02/26/04 02/26/04 EPA 8260B <br /> Surrogate Dibromofluoromethane 105% 84-111 " <br /> Surrogate 1,2-Dichloroethane-d4 100% 74-135 " <br /> Surrogate Toluene-d8 96% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 105% 86-119 " <br /> MW-11 (P402408-07)Water Sampled 02/16/04 14 05 Received 02/17/04 07 45 <br /> Tert-amyl methyl ether ND 1 0 ug/1 1 4020577 02/26/04 02/26/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 <br /> " <br /> �i-isopropyl ether ND 1 0 <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 100% 84-111 <br /> Surrogate 12-Dichloroethane-d4 98% 74-135 " <br /> Surrogate Toluene-d8 95% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 106% 86-119 " <br /> Sequoia Analytical-Petaluma The results rn 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 10 of 18 <br />