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l' <br /> t: 1455 McDowell Blvd,North D <br /> Sequoia Petaluma,CA 94949 54 <br /> (701)792-1865 <br /> Analytical FW.3e9U)79 s.com <br /> www.sequoiatabs.com <br /> URS Corp-Sacramento Project: Arco Site 548,Stockton,CA P310024 <br /> 2870 Gateway Oaks Drive Suite 300 Project Nu nber: WR36608 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 10/13/03 17:17 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyred Method Notes <br /> INF Total Air(P310024-01)Air Sampled:09/29/03 09:10 Received:09/30/03 10:00 <br /> Gasoline Range Organics 1100 50 mg/m'Air 1 3090664 09/30/03 09/30/03 EPA <br /> 8015DI8021B <br /> Benzene 3.5 0.50 " QR-04 <br /> Toluene 83 0.50 " <br /> Ethylbenzene 24 0.50 " <br /> Xylenes(total) 140 0.50 <br /> Methyl tert-butyl ether 2.2 2.0 " <br /> Surrogate:a,a,a-Trifluorotoluene 99% 65-135 " <br /> Surrogate:4-Bromofluorobenzene 99% 65-135 <br /> Gasoline Range Organics 330 14 ppmv <br /> Benzene 1.1 0.16 " QR-04 <br /> Toluene 22 0.13 <br /> Ethylbenzene 5.5 0.12 " <br /> lenes(total) 33 0.12 " " <br /> ethyl tent-butyl ether 0.60 0.56 " " " " <br /> Surrogate:a,a,a-Trifluorotoluene 99% 65-135 <br /> Surrogate:4-Bromofluorobenzene 99% 65-135 <br /> INF Cat Air(P310024-02)Air Sampled:09/29/03 09:05 Received:09/30/03 10:00 <br /> Gasoline Range Organics 1200 50 mg/m'Air 1 3090664 09/30/03 09/30/03 EPA <br /> 8015131902113 <br /> Benzene 3.4 0.50 " QR-04 <br /> Toluene 83 0.50 " " " " <br /> Ethylbenzene 25 0.50 " <br /> Xylenes(total) 160 0.50 " <br /> Methyl tert-butyl ether 2.1 2.0 <br /> Surrogate:a,a,a-Trifluorotoluene 96% 65-135 " <br /> Surrogate.4-Bromofluorobenzene 100% 65-135 <br /> Gasoline Range Organics 340 14 ppmv " <br /> Benzene 1.1 0.16 " QR-04 <br /> Toluene 22 0.13 <br /> Ethylbenzene 5.9 OA2 <br /> Xylenes(total) 37 0.12 " <br /> Methyl tert-butyl ether 0.57 0.56 " <br /> Surrogate:a.a,a-Trifluorotoluene 96% 65-135 " <br /> Surrogate:4-Bromofluorobenzene 100% 65-135 " <br /> quoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chairs 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 7 <br />