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+l <br /> ~ Sequoia 1455 McDowell Blvd,North Ste D <br /> 4DPetaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792 0342 <br /> www sequoialabs corn. <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-6(P312285-06RE1)Water Sampled 11/09/03 04 17 Received 12/10/03 09 00 <br /> 1,2-Dichloroethane 140 50 ug/l 10 3120675 12/23/03 12/23/03 EPA 8260B <br /> Surrogate Dibromofluoromethane 104% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 102% 74-135 " <br /> Surrogate Toluene-d8 102% 84-119 " <br /> Surrogate 4-BrornoJluorobenzene 103% 86-119 " <br /> MW-7(P311285-07)Water Sampled 12/09/03 01 47 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 10 ugll 1 3120675 12/23/03 12/23/03 EPA 82608 <br /> Benzene ND 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 ND 0 50 " <br /> thy]Cert-butyl ether ND 1 0 <br /> ethyl ten-butyl ether ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 102% 84-122 <br /> Surrogate 12-Dichloroethane-d4 99% 74-135 " <br /> Surrogate Toluene-d8 103% 84-119 " <br /> Surrogate 4-Bromo_Jluorobenzene 101% 86-119 " <br /> VW-1(P312285-IOREi)Water Sampled 12/10/03 04 45 Received 12/10/03 09 00 <br /> Ten-amyl methyl ether ND 1 0 ugll 1 3120709 12/24/03 12/24/03 EPA 82608 <br /> Benzene 18 050 <br /> Tert-butyl alcohol 37 20 <br /> Di-isopropyl ether ND 10 ^ <br /> 1,2-Dichloroethane 3 5 050 <br /> Ethanol ND 100 <br /> Ethylbenzene 68 050 <br /> Ethyl ten-butyl ether ND 10 <br /> Methyl tert-butyl ether 13 050 <br /> Toluene ND 050 ^ ^ <br /> Xylenes(total) 1 5 050 <br /> Surrogate Dibromofluoromethane 112% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 121% 74-135 <br /> I i <br /> I <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stared results are reported on a wet weight <br /> • basis This analytical report must be reproduced in its entirety <br /> I <br /> Page 14 of 35 <br />