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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 44954 <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 CA,95833 Project 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 /> VW-2B(P403321-09)Water Sampled.03/10/04 05 30 Received.03/15/04 08 40 <br /> Tert-amyl methyl ether ND 10 ug/1 1 4030678 03/24/04 03/24/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Dr-isopropyl ether ND 10 " <br /> 1,2-Drchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <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 Dibromgfluoromethane 116% 84-122 " <br /> Surrogate 1 2-Drchloroethane-d4 135% 74-135 " <br /> agate Toluene-d8 95% 84-119 " <br /> rogate 4-Bromofluorobenzene 96% 86-119 " <br /> VW-311(P403321-10)Water Sampled 03/10/04 05 05 Received 03/15/04 08 40 <br /> Tert-amyl methyl ether ND 20 ug/1 20 4030678 03/24/04 03/24/04 EPA 8260B <br /> Benzene ND 10 " <br /> Tert-butyl alcohol ND 400 " <br /> Di-isopropyl ether ND 20 " <br /> 1,2-Drchloroethane ND 10 " <br /> Ethanol ND 2000 " <br /> Ethylbenzene ND 10 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether 111 14s4vR 240 10 " <br /> hi -k, <br /> Toluene �m ND 10 " <br /> Xylenes(total) ND 10 " <br /> Surrogate Dibromofluoromethane 120% 84-122 " <br /> Surrogate 1 2-Drchloroethane-d4 h' 144 74-135 SOI <br /> Surrogate Toluene-d8 95% 84-119 " <br /> Surrogate 4-Bromolluorobenzene 97% 86-119 " <br /> �uoia 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 9 of 15 <br />