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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA�- 54 <br /> 7994(747)792-1865865 <br /> Analytical FAX(707)792.0342 <br /> www,$equoialabs.com <br /> • <br /> URS Corp-Sacramento Project: Arco Site 548,Stockton,CA P306573 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36608 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 07/01/03 15:21 <br /> Total Petroleum Hydrocarbons as Gasoline 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(P306573-01)Air Sampled:06/24/03 12:55 Received:06/14/03 14:00 <br /> Gasoline Range Organics 24 10 mg/m'Air 4.2 3060704 06/27/03 06/27/03 EPA <br /> 801513/8021B <br /> Benzene ND 0.10 " <br /> Toluene 0.11 0.10 " QR-04 <br /> Ethylbenzene ND 0.10 <br /> Xylenes(total) ND 0.10 " <br /> Methyl tert-butyl ether ND 0.40 " <br /> Surrogate:a,a,a-Trifluorotoluene 98% 65-135 " <br /> Surrogate:4-Bromofluorobenzene 91% 65-135 " <br /> Gasoline Range Organics 6.8 2.8 ppmv 0.2 " <br /> Benzene ND 0.032 " <br /> Toluene 0.028 0.026 QR-04 <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 98% 65-135 <br /> Surrogate: 4-Bromofluorobenzene 93% 65-135 " <br /> INS'CAT AIR(P306573-02)Air Sampled:06/24/03 12:50 Received:06/24/03 14:00 <br /> Gasoline Range Organics 24 10 mg/m'Air 0.2 3060704 06/27/03 06/27/03 EPA <br /> 801513/802113 <br /> Benzene ND 0.10 " <br /> Toluene ND 0.10 " <br /> Ethylbenzene ND 0.10 " <br /> Xylenes(total) 0.17 0.10 " <br /> Methyl tert-butyl ether ND 0.40 " <br /> Surrogate:a,a,a-Trifluorotoluene 101 % 65-135 <br /> Surrogate:4-Bromofluorobenzene 94% 65-135 " <br /> Gasoline Range Organics 6.9 2.8 ppmv 0.2 " <br /> Benzene ND 0.032 " <br /> Toluene ND 0.026 " <br /> Ethylbenzene ND 0.024 " <br /> Xylenes(total) 0.039 0.024 " <br /> Methyl tert-butyl ether ND 0.11 " <br /> Surrogate:a,a,a-Trifluorotoluene 101 % 65-135 " <br /> Surrogate 4-Bromofluorobenzene 94% 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 />