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S (� 1455 McDowell Blvd North Ste <br /> equoia o)<a Petaluma,CA 949544 <br /> Analytical FAX(707707)792-1865 <br /> • 792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P305380 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/18/03 21:10 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 801513/802113 <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Uaits Dilution Batch Prepared Analyzed Method Note <br /> MW-1 (P305380-01)Water Sampled:05/19/03 10:10 Received:05/19/03 11:45 <br /> Gasoline Range Organics ND 50 ug/1 1 3050703 05/28/03 05/28/03 EPA <br /> Benzene ND 0.50 8015B/802IB <br /> Toluene ND 0.50 <br /> Ethylbenzene ND OSO <br /> Xylenes(total) ND 0.50 <br /> Surrogate:a,a,a-Trifluorotoluene III % 65-135 <br /> Surrogate:4-Bromofluorobenzene 96% 65-135 <br /> MW-2(P305380-02)Water Sampled:05/19/03 09:40 Received:05/19/03 11.45 <br /> Gasoline Range Organics ND 50 ug/i 1 3050703 05/28/03 05/28/03 EPA <br /> 8015B/80213 <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 <br /> hylbenzene ND 0.50 <br /> ylenes(total) 0.65 0.50 " <br /> Surrogate:a,a,a-Trifluorotoluene 111 % 65-135 <br /> Surrogate:4-Bromofluorobenzene 97% 65-135 <br /> MW-3(P305380-03)Water Sampled: 05/19/03 09:56 Received:05/19/03 11:45 <br /> Gasoline Range Organics ND 50 u8A 1 3050703 05/28/03 05/28/03 EPA <br /> 801513/8021B <br /> Benzene ND 0.50 <br /> Toluene ND 0.50 <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 <br /> Surrogate:a,a,a-Triuorotoluene 111 % 65-135 " <br /> Surrogate:4-Bromofluorobenzene 96% 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 7 of 36 <br />