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1455 McDowell Blvd,North Ste D <br /> Sequoia Petalum 4954 <br /> 7)792 1865 <br /> Analytical egvoi 742 1 urn <br /> FAX(707)792-0342 <br /> www sequoialabs cum <br /> is <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Protect Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/18/05 It 34 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Lunt Units Dilution Batch Prepared Analyzed Method NO, <br /> MW-5(P412423-05)Water Sampled 12/21/04 06 15 Received 12/23/04 10 30 <br /> Tert-amyl methyl ether ND 10 ugll 1 5010012 01/03/05 01/03/05 EPA 8260B <br /> Benzene 3 0 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dichloroethane ND 050 <br /> Ethanol ND 100 " <br /> Ethylbenzene 13 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 3 8 050 " <br /> Toluene 51 050 " <br /> Xylenes(total) 11 050 " <br /> Surrogate Dibromofluoromethane 97% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 96% 74-135 " <br /> Surrogate Toluene-d8 105% 84-119 " <br /> Wurrogate 4-Bromofluorobenzene 103% 86-119 " <br /> MW-6(P412423-06)Water Sampled 12/20/04 1105 Received 12/23/04 10 30 <br /> Tert-amyl methyl ether ND 10 ug/l 1 5010012 01/03/05 01/03/05 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dichloroethane 12 050 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl cert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dtbromofluoromethane 96% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 94% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 104% 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 8 of 33 <br />