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1455 McDowell Blvd,North Ste <br /> 4D Sequoia Petaluma,CA 949544 <br /> (707)792-1865 <br /> �F 342 <br /> Analytical FAX(707www sequoialabs cam <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P306136 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/16/03 08 50 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Lmut Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-4(P306136-04)Water Sampled 06/09/03 03 47 Received 06/09/03 08 00 R-05 <br /> Gasoline Range Organics ND 500 ug/1 10 3060347 06/16/03 06/16/03 EPA <br /> 80ISBl8D21B <br /> Benzene ND 5 0 " <br /> Toluene ND 5 0 " <br /> Ethylbenzene ND 5 0 " <br /> Xylenes(total) ND 5 0 " <br /> Surrogate a a a-Triuorotoluene 106% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 91 % 65-135 " <br /> MW-5(P306136-05)Water Sampled 06/09/03 07 25 Received 06/09/03 08 00 <br /> Gasoline Range Organics ND 50 ug/l 1 3060347 06/16/03 06/16/03 6PA <br /> 801513/802113 <br /> Benzene ND 050 " <br /> Toluene ND 050 ' <br /> �thylbettzene ND 0 50 <br /> ylenes(total) ND 0 SD " <br /> Surrogate a,a a-Trifluorotoluene 102% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 93% 65-135 ' " <br /> MW-6(P306136-06)Water Sampled 06/09/03 06 40 Received 06/09/03 08 00 <br /> Gasoline Range Organics ND 50 ug/l 1 3060347 06/16/03 06/16/03 EPA <br /> 8015B18027B <br /> Benzene ND 050 <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trifluorotoluene 102% 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 4 of 15 <br />