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1455 McDowell Blvd North Ste <br /> Sequoia Petalumai, 79 94954 <br /> (707)792-18b5865 <br /> FAX <br /> 42 <br /> Analytical wwsequ7talabs corn www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P402408 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/02/04 10 16 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Lirrut Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-12(P402408-08)Water Sampled 02/16/04 11 50 Received 02/17/04 07 45 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 4020577 02/26/04 02/26/04 EPA 82603 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <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 104% 84-122 " <br /> (urrogate 1 2-Dichloroethane-d4 101 % 74-135 " <br /> urrogate Toluene-d8 96% 84-119 <br /> Surrogate 4-Brornofluorobenzene 106% 86-119 " <br /> MW-13D(P402408-09)Water Sampled 02/16/04 12 05 Received 02117104 07 45 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 4020577 02/26/04 02/26/04 EPA 9260B <br /> Benzene ND 0 50 " " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 27 0 50 " <br /> Toluene 052 050 " <br /> Xylenes(total) 053 050 " <br /> Surrogate Dibromofluoromethane 105% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 102% 74-135 " <br /> Surrogate Toluene-d8 94% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 104% 86-119 <br /> Sequoia Analytical-Petaluma The results to 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 /> 0 This analytical report must be reproduced in its entirety <br /> Page 11 of 18 <br />