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Sequoia ]455 McDowell Blvd,North Ste 4 <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P403321 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento GA,95833Project Manager Vernon P Elarth 03/29/04 17 13 <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-5(P403321-05)Water Sampled 03/10/04 07 11 Received 03/15/04 08 40 <br /> Tert-amyl methyl ether ND 10 ugll 1 4030659 03/23/04 03/23/04 EPA 8260B <br /> Benzene ND 050 1. 1. " <br /> Tert-butyl alcohol ND 20 " " " <br /> Di-isopropyl ether ND 10 " " " It <br /> ^ " <br /> 1,2-Dtchloroethane ND 050 <br /> Ethanol ND 100 <br /> Ethylbenzene — ND 0 50 <br /> Ethyl tent-butyl ether ND 1 0 <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 121 % 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 141 % 74-135 Sol <br /> ogate Toluene-d8 100% 84-119 " <br /> rogate 4-Bromofluorobenzene 106% 86-119 " <br /> MW-6(P403321-06)Water Sampled 03/10/04 06 31 Received 03/15/04 08 40 <br /> Tert-amyl methyl ether ND 1 0 u8A 1 4030678 03/24/04 03/24/04 EPA 8260B <br /> Benzene ND 0 501 <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 /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050" <br /> ,Surrogate Dibromofluoromethane 105% 84-122 " <br /> Surrogate 1,2-Dtchloroethane-d4 117% 74-135 " <br /> Surrogate Toluene-d8 93 % 84-119 " <br /> Surrogate 4-Bromofluorobenzene 96% 86-119 " <br /> �uola Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 7 of 15 <br />