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1 <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> MEMO- <br /> f www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 6100,Tracy,CA P306337 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36619 Reported: } <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 07/02/03 16:43 1[ <br /> i <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 /> VW-6(P306337-04)Water Sampled:06/16/03 06:32 Received:06/17/03 15:00 <br /> -± Gasoline Range Organics 11000 2500 ug/l 50 3060635 06/25/03 06/25/03 EPA HC-19 <br /> 8015B/8021B <br /> Benzene 6900 25 <br /> Toluene ND 25 1 <br /> Etbylbenzene ND 25 <br /> Xylenes(total) 50 25 " <br /> Surrogate:a,a,a-Trifluorotoluene 104% 65-135 " <br /> Surrogate:4-Bromofluorobenzene 84% .65-135 - <br /> VW-20(P306337-05)Water Sampled:06/16/03 06:31 Received:06/17/03 15:00 I <br /> Gasoline Range Organics 63000 5000 ug/l 100 3060635 06/25/03 06/25/03 EPA <br /> 8015B/8021B , <br /> Benzene 13000 50 " <br /> t: Toluene 13000 50 <br /> L—?thylbenzene 1100 50 " <br /> ylenes(total) 10000 50 <br /> Surrogate:a,a,a-Trifluorotoluene .103% 65-135 <br /> Surrogate:4-Bromofluorobenzene 87% 65-135 <br /> Domestic Well(P306337-06)Water Sampled:06/16/03 06:52 Received:06/17/03 15:00 <br /> k Gasoline Range Organics ND 50 ug/l 1 3060635 06125/03. 06/25/03 EPA <br /> 8015BY8021B <br /> Benzene ND 0.50 <br /> Toluene ND 0.50 <br /> Ethylbenzene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> aaa-Tr <br /> Surrogate: i uorotoluene 104% 65-135 <br /> g <br /> Surrogate:4-Bromofluorobenzene .85% '65-735 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed inaccordance 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 10 <br /> . ,l <br />