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Sequoia <br /> 1455 McDowell Blvd,North Ste D <br /> ►J uQl`d Petaluma,CA 94954 <br /> + (707)792 1865 <br /> 11W 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 lntnm-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 Motes <br /> ATR-1 (P403320-01)Water Sampled 03/12/04 10 50 Received 03/12/0415 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-Dtchloroethane-d4 954% 78-129 <br /> ATR-2(P403320-02)Water Sampled 03/12/0412 00 Received 03/12/04 15 50 <br /> Benzene ND 050 ug/l 1 4C25003 03/25/04 03/25/04 EPA 8260E <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate 1,2-Dichloroethane-d4 932% 78-129 ^ " <br /> ATR-3(P403320-03)Water Sampled 03/12/04 12 25 Received 03/12/04 15 50 <br /> fthy <br /> zene ND 050 ug/1 1 4C25003 03/25/04 03/25/04 EPA 8260B <br /> uene ND 050lbenzene ND 050 ^ <br /> Xylenes(total) ND 050 " ^ <br /> Surrogate 1 2-Dtchloroethane-d4 964% 78-129 <br /> ATR-4(P403320-04)Water Sampled 03/12/04 10 10 Received 03/12/04 15 50 <br /> Benzene 1 4 050 ug/1 l 4025003 03/25/04 03/25/04 EPA 8260B <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) 3 5 050 " <br /> Surrogate 12-Dtchloroethane-d4 966% 78-129 <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 be reproduced in its entirety <br /> Page 3 of 16 <br />