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1455 McDowell Blvd,North Ste <br /> Sequoia Petaluma,CA 949544 <br /> lx� (707)792-1865 <br /> r� Analytical FAX(707)792-0342 <br /> www sequoialabs corn <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-Petalunna <br /> Reporting <br /> Analyte Result Lieut Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1 (P306136-01)Water Sampled 06/09/03 06 12 Received 06/09/03 08 00 <br /> Gasoline Range Organics ND 2500 ugA 50 3060347 06/16/03 06/16/03 EPA <br /> 8015BI8021B <br /> Benzene 79 25 " <br /> Toluene ND 25 " <br /> Ethylbenzene ND 25 <br /> Xylenes(total) ND 25 " <br /> Surrogate a a a-Trrfluorotoluene 103% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 94% 65-135 " <br /> MW-2(P306136-02)Water Sampled 06/09/03 04 25 Received 06/09/03 08 00 <br /> Gasoline Range Organics ND 50 ug/l 1 3060347 06/16/03 06/16/03 EPA <br /> 8015B/8021B <br /> Benzene ND 0 50 " <br /> Toluene ND 050 " <br /> Xthylbenzene ND 050 <br /> ylenes(total) ND 0 50 <br /> Surrogate a a a-Trrfluorotoluene 103 % 65-135 " <br /> Surrogate 4-Bromofluorobenzene 95% 65-135 " <br /> MW-3(P306136-03)Water Sampled 06/09/03 05 05 Received 06/09/03 08 00 <br /> Gasoline Range Organics ND 50 ugA 1 3060347 06/16/03 06/16/03 EPA <br /> 801513/802113 <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a,a,a-Tri luorotoluene 104% 65-135 " <br /> Surrogate 4-Bromci luorobenzene 93 % 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 3 of 15 <br />