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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> a— ) (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs tom <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P403320 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-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 Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> ATR-9(P403320-09)Water Sampled 03/12/0410 30 Received 03/12/04 15 50 <br /> Benzene ND 050 ug/1 1 4025003 03/25/04 03/26/04 EPA 8260B <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 12-Dtchloroethane-d4 958% 78-129 " <br /> ATR-10(P403320-10)Water Sampled 03/12/04 09 10 Received 03/12/0415 50 <br /> Benzene ND 050 ug/l 1 4C25003 03/25/04 03/26/04 EPA 8260B <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 <br /> Surrogate 1 2-Dtchloroethane-d4 996% 78-129 " <br /> ATR-11 (P403320-11)Water Sampled 03/12/04 09 30 Received 03/12/0415 50 <br /> 0thylbenzene <br /> izene ND 0 50 ug/l 1 4C25003 03/25/04 03/26/04 EPA 8260B <br /> uene ND 0 50 " <br /> ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 1,2-Dtchloroethane-d4 984% 78-129 " <br /> ATR-12(P403320-12)Water Sampled 03/12/04 09 50 Received 03/12/04 15 50 <br /> Benzene ND 050 ug/1 1 4C25003 03/25/04 03/26/04 EPA 82608 <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 1,2-Dtchloroethane-d4 100% 78-119 " <br /> �quoia 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 he reproduced in its entirety <br /> Page 5 of 16 <br />