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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma.CA 94954 <br /> (707)792-1865 <br /> V0. Analytical FAX(747)792-0342 <br /> wwwseggoialabs.com <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 8015B/8021B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> EFF AIR(P306573-03)Air Sampled:0612410312:45 Received:06/24/03 14:00 <br /> Gasoline Range Organics ND 10 mg/m'Air 0.2 3060704 06/27/03 06/27103 EPA <br /> 8015B/8021B <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-Triuorotoluene 99% 65-135 " <br /> Surrogate:4-Bromofluorobenzene 88% 65-135 " <br /> Gasoline Range Organics ND 2.8 pprnv 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 cert-butyl ether ND 0.11 <br /> Surrogate:a,a.a-Trifluorotoluene 99% 65-135 <br /> Surrogate:4-Bromofluorobenzene 88% 65-135 " <br /> The results in this report apply to the samples analyzed in accordance with the chain o <br /> Sequoia Analytical-Petaluma P PPY P Y J <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 4 of 7 <br />