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a_ _� (1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical FAX <br /> 707)792-1865 <br /> (707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-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 Limit Units Dilution Batch Prepared Analyzed Method Note <br /> VW-11 (P412423-16RE1)Water Sampled 12/20/04 13 25 Received 12/23/04 10 30 CL <br /> Benzene 48 12 ug/l 25 5010152 01/12/05 01/12/05 EPA 8260B <br /> Ethylbenzene 120 12 " <br /> Surrogate Dtbromofluoromethane 98% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 100% 74-135 " <br /> i <br /> Surrogate Toluene-d8 108% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 102% 86-119 " <br /> VW-12(P412423-17)Water Sampled 12/20/04 13 00 Received 12/23/04 10 30 CI <br /> Tart-amyl methyl ether ND 10 ug/l 1 5010016 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-Dtchloroethane 310 050 E <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether 0 82 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dtbromofluoromethane 95% 84-122 " <br /> Surrogate 12-Drchloroethane-d4 105% 74-135 " <br /> Surrogate Toluene-d8 92% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 95% 86-119 " <br /> VW-12(P412423-17RE1)Water Sampled 12/20/04 13 00 Received 12/23/04 10 30 CL <br /> Tert-amyl methyl ether ND 10 ug/l 10 5010152 01/12/05 01/12/05 EPA 8260B <br /> Benzene ND 5 0 " <br /> Tert-butyl alcohol ND 200 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dtchloroethane 260 5 0 " <br /> Ethanol ND 1000 " <br /> Ethylbenzene ND 50 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 5 0 " <br /> Toluene ND 50 " <br /> Xylenes(total) ND 5 0 " <br /> Surrogate Dibromofluoromethane 97% 84-122 " <br /> Surrogate 1,2-Dichloroeehane-d4 97% 74-135 " <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 enirrety <br /> Page 15 of 33 <br />