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1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Sequoia (707)792-1865 <br /> ID -FAX(707)792-0342 <br /> Analytical www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 548,Stockton,CA P305579 <br /> ProjectNumber:NumbWR36608 Reported: <br /> 2870 Gateway Oaks Drive Suite 300 06/13/03 09:21 <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015BI8021B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limn Units Dilution Batch Prepared Analyzed <br /> Method Note <br /> EFF Air(P305579-03)Air Sampled:05/28/03 12:15 Received:05/28/03 13:30 <br /> Gasoline Range Organics ND 10 mglm'Air 0.2 3050763 05/30/03 05/30/03 EPA9201B5B/ <br /> Benzene ND 0.10 <br /> Toluene ND 0'10 <br /> Ethylbenzene ND 0.10 <br /> Xylenes(total) 0.73 0'10 <br /> Methyl tert-butyl ether ND 0.40 H <br /> Surrogate:a,a,a-Trifluorotoluene 103% 65-135 i <br /> Surrogate:4-Bromofluorobenzene 99% 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 <br /> Xylenes(total) 0.17 0.024 <br /> Methyl tert-butyl ether ND 0.11 „ <br /> Surrogate:a,a,a-Trifluorotoluene 103% 65-135 „ <br /> Surrogate:4-Bromo,Jluorobenzene 99% 65-135 <br /> Sequoia Analytical <br /> Petaluma custody <br /> 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 4 of 7 <br />