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b <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> )792-1865 <br /> Analytical (7 <br /> FAX(707(707) <br /> www.sequoialabs.wm <br /> URS Corp-Sacramento Project: Arco Site 548,Stockton,CA 1`310501 <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 /> Purgeable Hydrocarbons and BTEX by EPA 8015B18021B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> INF Total Air(P310501-01)Air Sampled:10/20/03 08:25 Received: 10/21/03 09:45 <br /> Gasoline Range Organics 780 50 mg/m'Air 1 3100490 10/21/03 10/21/03 EPA <br /> 801513/8021B <br /> Benzene ND 0.50 " <br /> Toluene 3.6 0.50 QR-04 <br /> Ethylbenzene 10 0.50 " <br /> Xylenes(total) 150 0.50 " <br /> Methyl tert-butyl ether 2.0 2.0 " <br /> Surrogate.,a,a,a-Trifluorotoluene 99% 65-135 " <br /> Surrogate:4-Bromofluorobenzene 94% 65-135 " <br /> Gasoline Range Organics 220 14 ppmv " <br /> Benzene ND 0.16 " <br /> Toluene 0.97 0.I3 QR-04 <br /> Ethylbenzene 2.4 0.12 " <br /> Xylenes(total) 35 0.12 " <br /> Methyl tert-butyl ether ND 0.56 " 01 n <br /> Surrogate:a,a,a-Trifluorotoluene 99% 65-135 <br /> Surrogate:4-Bromofluorobenzene 94% 65-135 " <br /> INF Cat Air(P310501-02)Air Sampled:10/20/03 08:20 Received: 10/21/03 09:45 <br /> Gasoline Range Organics 780 50 mg/m'Air 1 3100490 10/21/03 10/21/03 EPA <br /> 8015B/8021 B <br /> Benzene ND 0.50 " <br /> Toluene 3.5 0.50 QR-04 <br /> Ethylbenzene 9.9 0.50 <br /> Xylenes(total) 150 0.50 " <br /> Methyl tert-butyl ether ND 2.0 <br /> Surrogate:a,a,a-Trifluorotoluene 101 % 65-135 " <br /> Surrogate:4-Bromofluorobenzene 97% 65-135 " 11 " <br /> Gasoline Range Organics 220 14 ppmv " <br /> Benzene ND 0.16 " <br /> Toluene 0.92 0.13 QR-04 <br /> Ethylbenzene 2.3 0.12 " n <br /> Xylenes(total) 34 0.12 " <br /> Methyl tert-butyl ether ND 0.56 " <br /> Surrogate:a,a,a-Trfluorotoluene 101 % 65-135 " <br /> Surrogate:4-Bromofluorobenzene 97% 65-135 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of eusiody document. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 3 of 7 <br />