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Sequoia 1455 McDowel�etalBlvd, <br /> uma,CA 949 4 <br /> (707)792-1865 <br /> Analytical w,seq 7)792-0342 <br /> • wwwsequoia[abs.com <br /> URS Corp-Sacramento Project: Arco Site 548,Stockton,CA P305579 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36608 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 06/13/03 09:21 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> j Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> INF Total Air(P305579-01)Air Sampled:0512810312:35 Received:0512810313:30 <br /> Gasoline Range Organics 44 10 mg/m'Air 0.2 3050763 05/30/03 05/30/03 EPA 8015B/ <br /> 8021B <br /> Benzene ND 0.10 <br /> Toluene ND 0.10 <br /> Ethylbenzene 0.19 0.10 <br /> Xylenes(total) 0.54 0.10 QR-04 <br /> Methyl tert-butyl ether ND 0.40 " <br /> Surrogate:a,a,a-Trifluorotoluene 98% 65-135 " <br /> Surrogate:4-Bromofluorobenzene 106% 65-135 " <br /> Gasoline Range Organics 12 2.8 ppmv 0.2 " <br /> Benzene ND 0.032 ^ <br /> Toluene ND 0.026 " <br /> Ethylbenzene 0.044 0.024 " <br /> • Xylenes(total) 0.13 0.024 QR-04 <br /> Methyl tert-butyl ether ND 0.11 <br /> Surrogate:a,a,a-Trifluorotoluene 98% 65-135 " <br /> Surrogate:4-Bromofluoroberrzene 106% 65-135 " <br /> INF Cat Air(P305579-02)Air Sampled:05/28/03 12:25 Received:05/28/03 13:30 <br /> Gasoline Range Organics 38 10 mg/m'Air 0.2 3050763 05/30/03 05/30/03 EPA 8015B1 <br /> 802113 <br /> Benzene ND 0.10 " <br /> Toluene ND 0.10 " <br /> Ethylbenzene 0.16 0.10 " <br /> Xylenes(total) 0.36 0.10 QR-04 <br /> Methyl tert-butyl ether ND 0.40 " <br /> Surrogate:a,a,a-Triuorotoluerre 98% 65-135 " <br /> Surrogate:4-Bromofluorobenzene 105% 65-135 " <br /> Gasoline Range Organics 11 2.8 ppmv 0.2 " <br /> Benzene ND 0.032 " <br /> Toluene ND 0.026 <br /> Ethylbenzene 0.038 0.024 " <br /> Xylenes(total) 0.083 0.024 QR-04 <br /> Methyl tert-butyl ether ND 0.11 <br /> Surrogate:a,a,a-Trifluorotoluene 98% 65-135 " <br /> Surrogate:4-Bromofluorobenzene 105% 65-135 " <br /> • Sequoia 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 7 <br />