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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 corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 17 56 <br /> BTEX by EPA Method 8260B <br /> Sequoia Analytical -Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-1 (P406495-01)Water Sampled 06/23/04 03 49 Received 06/25/04 09 30 <br /> Benzene ND 050 ugA 1 4GO7003 07/07/04 07107104 EPA 8260E <br /> Ethylbenzene ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 1,2-Dichloroethane-d4 91% 78-129 " <br /> MW-2(P406495-02)Water Sampled 06/23/04 05 02 Received 06/25/04 09 30 <br /> Benzene 063 050 ug/1 1 4GO7003 07/07/04 07/07/04 EPA 8260B <br /> Ethylbenzene ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 12-Dichloroethane-d4 101% 78-129 " <br /> MW-3(P406495-03)Water Sampled 06/23/04 04 34 Received 06/25/04 09 30 <br /> � <br /> nzene ND 050 ug/l 1 4GO7003 07/07/04 07/07/04 EPA 8260B <br /> ylbenzene ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate 1,2-Dichloroethane-d4 106% 78-129 " <br /> MW4(P406495-04)Water Sampled 06/23/04 03 10 Received 06/25/04 09 30 <br /> Benzene 0 80 050 ugA 1 4GO7003 07/07/04 07107104 EPA 8260B <br /> Ethylbenzene ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) 0 50 050 " <br /> Surrogate 1 2-Dichloroethane-d4 110% 78-129 " <br /> I <br /> I <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 entirety <br /> Page 7 of 41 <br />