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1455 McDowell Blvd North Ste D <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> W Analytical FAX(707)792-0342 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P403320 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/05/04 11 06 <br /> BTEX by EPA Method 8260B <br /> Sequoia Analytical -Morgan Hill <br /> Reporting <br /> Analyte Result Litmt Units Dilution Batch Prepared Analyzed Method Notes <br /> ATR-5(P403320-05)Water Sampled 03/12/04 1I 40 Received 03/12/04 15 50 <br /> Benzene ND 050 ug/l 1 4C25003 03/25/04 03/25/04 EPA 8260B <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate 1,2-Dichloroethane-d4 994% 78-129 <br /> ATR-6(P403320-06)Water Sampled 03/12/0411 20 Received 03/12/04 15 50 <br /> Benzene ND 050 ug/1 1 4C25003 03/25/04 03/26/04 EPA 8260E <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate 1,2-Dtchloroethane-d4 992% 78-129 " <br /> ATR-7(P403320-07)Water Sampled 03/12/0413 05 Received 03/12/04 15 50 <br /> nzene ND 050 ug/l 1 4C25003 03/25/04 03/26/04 EPA 8260E <br /> uene ND 050 " <br /> thylbenzene ND 050 " <br /> Xylenes(total) ND 050 <br /> Surrogate 12-Dtchloroethane-d4 948% 78-129 " <br /> ATR-8(P403320-08)Water Sampled 03/12/0412 50 Received 03/12/04 15 50 <br /> Benzene ND 050 ug/1 1 4C25003 03/25/04 03/26/04 EPA 82601 <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) 070 050 <br /> Surrogate 1 2-Dtchloroethane-d4 970% 78-129 " <br /> �uoia 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 4 of 16 <br />