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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> a— ) <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> is <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P412405 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/11/05 10 44 <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-3B(P411405-11)Water Sampled 12/21/04 20 05 Received 12/22/04 13 15 <br /> Tert-amyl methyl ether ND 25 ug/l 25 5010028 01/04/05 01/04/05 EPA 8260B <br /> Benzene ND 12 <br /> Tert-butyl alcohol ND 500 ^ <br /> Di-isopropyl ether ND 25 " ^ <br /> 1,2-Dibromoethane(EDB) ND 12 <br /> 1,2-Dichloroethane ND 12 ^ " <br /> Ethanol ND 2500 ^ <br /> Ethylbenzene ND 12 <br /> Ethyl tert-butyl ether ND 25 ^ <br /> Methyl tert-butyl ether 250 ---- 12 <br /> Toluene ND 12 <br /> Xylenes(total) 66 12 <br /> Surrogate Dibromofluoromethane 108% 84-122 " <br /> Surrogate 1,2-Dwhloroethane-d4 125% 74-135 " <br /> Surrogate Toluene-d8 111% 84-119 <br /> Surrogate 4-Bromofluorobenzene 111% 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 staled results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 12 of 18 <br />