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(D (701455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical r•Ax <br /> 7)792-0345 <br /> (707)792-0342 <br /> www.sequoialabs,com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P309139 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 10/16/03 19:28 <br /> BTEX by 8021B <br /> Sequoia Analytical -Petaluma <br /> Reporting, <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1(P309139-01)Water Sampled:09/09/03 06:13 Received:09/09/03 10:20 <br /> Benzene ND 0.50 ugll 1 3090325 09/16/03 09/16/03 EPA 8021B <br /> Toluene ND 0.50 <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) 0.55 0.50 " B <br /> Surrogate:a,a,a-Triuorotoluene 101 % 65-135 " <br /> MW-2(P309139-02)Water Sampled:09/09/03 05:09 Received:09/09/03 10:20 <br /> Benzene ND 0.50 ugll 1 3090325 09/16/03 09/16/03 EPA 8021E <br /> Toluene 0.56 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 <br /> Surrogate:a,a,a-Tri luorotoluene 102% 65-135 " <br /> MW-3(P309139-03)Water Sampled:09/09/03 05:44 Received:09/09/03 10:20 <br /> aenzene ND 0.50 ugll 1 3090325 09/16/03 09/16/03 EPA 8021 B <br /> luene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:a,a,a-Trifluorotoluene 102% 65-135 11 " <br /> MW-4(P309139-04)Water Sampled:09/09/03 08:05 Received:09/09/03 10:20 <br /> Benzene 1700 5.0 ug/l 10 3090325 09/16/03 09/16/03 EPA 8021B <br /> Toluene ND 5.0 " <br /> Ethylbenzene ND 5.0 " <br /> Xylenes(total) ND 5.0 " <br /> Surrogate:a,a,a-Trifluorotoluene 103% 65-135 " <br /> Sequoia <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 7 of 38 <br />