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l` <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> iW Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 548,Stockton,CA P310501 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36608 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 11/04/03 12:38 <br /> j Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> EFF Air(P310501-03)Air Sampled: 10/20/0308:15 Received: 10/21/03 09:45 <br /> Gasoline Range Organics ND 10 mg/m'Air 0.2 3100490 10/21/03 10/21/03 EPA <br /> 8015BI8021B <br /> Benzene ND 0.10 " <br /> Toluene ND 0.10 " <br /> Ethylbenzene ND 0.10 " <br /> Xylenes(total) ND 0.10 " <br /> Methyl tert-butyl ether ND 0.40 " <br /> Surrogate:a,a,a-Tris luorotoluene 100% 65-135 " <br /> Surrogate:4-Bromofluorobenzene 92% 65-135 " <br /> Gasoline Range Organics ND 2.8 ppmv 0.2 " <br /> Benzene ND 0.032 " <br /> Toluene ND 0.026 " <br /> Ethylbenzene ND 0.024 " <br /> Xylenes(total) ND 0.024 <br /> Methyl tert-butyl ether ND 0.11 <br /> Surrogate:a,a,a-Trifluorotoluene 100% 65-135 " <br /> Surrogate:4-Bromofluorobenzene 92% 65-135 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> . of custody document. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 4 of 7 <br />