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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> a— ) (707) <br /> Analytical 792-1865 <br /> FAX(707)792 0342 � <br /> www sequwalabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/18/05 11 34 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result l.imlt Units Dilution Batch Prepared Analyzed Method Noie <br /> VW-10(P412423-15)Water Sampled 12/21/04 07 15 Received 12/23/04 10 30 VQT <br /> .174-Bromo <br /> Surrogate uorobenzene 106% 86-119 5010022 01104105 01104105 EPS!8260B <br /> g <br /> VW-10(P412423-15RE1)Water Sampled 12/21/04 07 15 Received 12/23/04 10 30 CL <br /> Tert-amyl methyl ether ND 100 ugll 100 5010120 01/10/05 01/10/05 EPA 8260B <br /> Benzene 2600 56 " <br /> Tert-butyl alcohol ND 2000 " <br /> Di-isopropyl ether ND 100 " <br /> 1,2-Dichloroethane ND 50 " <br /> Ethanol ND 10000 " <br /> Ethylbenzene 2300 50 " <br /> Ethyl tert-butyl ether ND 100 <br /> Methyl tert-butyl ether ND 50 " <br /> Toluene 4400 50 " <br /> Xylenes(total) 7000 50 " <br /> W <br /> surrogate <br /> Dibromofluoromethane 703% 84-122 " <br /> 1,2-Dichloroethane-d4 103% 74-135 <br /> Surrogate Toluene-d8 105% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 103% 86-119 <br /> VW-1I(P412423-16)Water Sampled 12/20/04 13 25 Received 12/23/04 10 30 <br /> Tert-amyl methyl ether ND L 0 ug/l 1 5010012 01/03/45 01/03/05 EPA 8260E <br /> Benzene 30 050 E <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dichloroethane 4 5 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene 80 050 " E <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 069 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) 55 050 " <br /> Surrogate Dtbromofluoromethane 94% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 93% 74-135 " <br /> Surrogate Toluene-d8 107% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 105% 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 14 of 33 <br />