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a 1455 Mcllow Blvd,North Ste <br /> tx) Sequoia Petaluma,CA 949544 <br /> (707)792-1865 <br /> Analytical <br /> FAx(707)792-0342 <br /> WIW www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P304289 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vemon P Elarth 04/25/03 17 26 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result L=t Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1 304289-01 Water Sampled 04/10/031245 Received 04/11/03 14 30 <br /> Gasoline Range Organics 2700 1000 ug/l 20 3040403 04/17/03 04/17/03 EPA <br /> 8015B/8021B <br /> Benzene ND 10 " <br /> Toluene ND 10 " <br /> Ethylbenzene ND 10 <br /> Xylenes(total) ND 10 " <br /> Methyl tert-butyl ether 4500 50 " <br /> Surrogate a,a,a-Trifluorotoluene 107910 65-135 " <br /> Surrogate 4-Bromofluorobenzene 92 % 65-135 " <br /> MW-2(P304289-02)Water Sampled 04/10/03 12 20 Received 04/11/0314 30 _ <br /> Gasoline Range Organics 2000 1000 ug/1 20 3040403 04/17/03 04/17/03 EPA <br /> 8015B/8021B <br /> Benzene ND 10 " <br /> Toluene ND 10 " <br /> thylbenzene ND 10 " <br /> IlWylenes(total) ND 10 " <br /> Methyl tert-butyl ether 3400 50 " <br /> Surrogate a,a,a-Trifluorotoluene 104 Vo 65-135 " <br /> Surrogate 4-Bromofluorobenzene 91 % 65-135 " <br /> MW-3(P304289-03)Water Sampled 04/10/03 13 50 Received 0411110_3 14 30 <br /> Gasoline Range Organics ND 5000 ug/l 100 3040403 04/17/03 04/17/03 EPA <br /> 8015B/8021B <br /> Benzene ND 50 " <br /> Toluene ND 50 " <br /> Ethylbenzene ND 50 <br /> Xylenes(total) ND 50 " <br /> Methyl tert-butyl ether 10000 250 " <br /> Surrogate a,a,a-Trruorotoluene 104 Va 65-135 " <br /> Surrogate 4-Bromofluorobenzene 91 % 65-135 " <br /> 0Sequoia Analytical-Petaluma -- — The results in this report apply to the samples analyzed on 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 10 <br />