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1455 McDowell Blvd,North Ste D <br /> a_ _� Sequoia Petaluma CA 94954 <br /> 865 <br /> Analytical (70 )792 1 <br /> FAX(7077)742-0334242 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P412284 <br /> 2870 Gateway pales Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/13/05 08 48 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-4(P412284-01)Water Sampled 12/13/04 09 40 Received 12/14/0411 30 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 4120505 12/27/04 12/27/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-1)ichloroethane ND 0 50 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0 50 <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 96% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 99% 74-135 <br /> urrogate Toluene-d8 106% 84-119 <br /> Surrogate 4-Bromofluorobenzene 101 % 86-119 <br /> MW-5(P412284-02)Water Sampled 12/13/04 09 00 Received 12/14/04 11 30 VQT <br /> Tert-amyl methyl ether ND 1 0 ugli 1 4120505 12/27/04 12/27/04 EPA 8260B <br /> Benzene ND 050 " <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 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tcrt-butyl ether ND 050 " <br /> Toluene 0 55 050 <br /> Xylenes(total) 0 84 050 " <br /> Surrogate Dibromofluoromethane 97% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 98% 74-135 ;! <br /> Surrogate Toluene-d8 105% 84-119 <br /> lo <br /> Surrogate 4-Bromofluorobenzene 102% 86-119 " <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 4 of 11 <br />