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4DSequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> q Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www.sequoialabs.com <br /> i <br /> URS Corp-Sacramento Project: Arco Site 548,Stockton,CA P401175 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36608 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 01/29/04 14:59 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Balch Prepared Analyzed Method Notes <br /> INF Cat Air(P401175-01)Air Sampled:01/13/0409-.55 Received:01/14/04 10:00 <br /> Gasoline Range Organics 47 10 mg/m'Air 0.2 4010217 01/14/04 01/14/04 EPA <br /> Benzene ND 4.10 " ^ ^ 8015B/8021B^ <br /> Toluene ND 0.10 " " ^ to <br /> Ethylbenzene ND 0.10 <br /> Xylenes(total) 4.1 0.10 " <br /> Methyl tert-butyl ether 0.89 0.44 " ^ <br /> Surrogate:a,a,a-Trifluorotoluene 96% 65-135 <br /> Surrogate:4-Bromofluorobenzene 99% 65-135 ^ <br /> Gasoline Range Organics I3 2.8 ppmv 0.2 ^ " <br /> Benzene ND 0.032 <br /> Toluene ND 0.026 <br /> Ethylbenzene ND 0.024 to " to ol <br /> Xylenes(total) 0.95 0.024 " " ^ „ <br /> Methyl tert-butyl ether 0.25 0.11 " " ^ ^ to <br /> rrogate.,a,a,a-Trifluorotoluene 96% 65-135 <br /> Surrogate:4-Bromofluorobenzene 99% 65-135 " ^ <br /> EFF Air(P401175-42)Air Sampled:01/13/04 09:45 Received:01/I4/04 10:00 <br /> Gasoline Range Organics ND 10 mg/W Air 0.2 4010217 01/14/04 01/14/04 EPA <br /> Benzene ND 0.10 " " ^ ^ 8015B/8021B <br /> Toluene ND 0,10 <br /> Ethylbenzene ND 0.10 <br /> Xylenes(total) ND 0.I0 ^ <br /> Methyl tert-butyl ether ND 0.40 ^ <br /> Surrogate:a,a,a-Trifluorotoluene 96% 65-135 <br /> Surrogate:4-Bromofluorobenzene 98% 65-135 " ^ <br /> Gasoline Range Organics ND 2.8 ppmv 0.2 ^ <br /> Benzene ND 0.032 <br /> Toluene ND 0.026 ^ <br /> Ethylbenzene ND 0.024 to " « <br /> Xylenes(total) ND 0.024 to <br /> Methyl tert-butyl ether ND 0.11 1. " ^ <br /> Surrogate:a,a,a-Trifluorotoluerte 96% 65-135 <br /> Surrogate:4-Bromofluorobenzene 98% 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 6 <br />