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3 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 41� (707)792-1865 <br /> 342 <br /> Analytical www <br /> sequ7ialabs com <br /> www sequaalabs coni <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P306136 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/16/03 09 50 <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 /> MW-7(P306136-07)Water Sampled 06/09/03 06-58 Received 06/09/03 08 00 <br /> Gasoline Range Organics ND 50 ugll 1 3060347 06/16/03 06/16/03 EPA <br /> 8015B/8021B <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trifluorotoluene 104% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 99% 65-135 " <br /> VW-1B(P306136-08)Water Sampled 06/09/03 06 07 Received 06/09/03 08 00 R-05 <br /> Gasoline Range Organics ND 250 ug/l 5 3060347 06/16/03 06/16/03 EPA <br /> 8015B/8021B <br /> Benzene ND 2 5 " <br /> Toluene ND 2 5 " <br /> W <br /> thylbenzene ND 25 " <br /> ylenes(total) ND 2 5 " <br /> Surrogate a a a-Tris luorotoluene 103% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 92% 65-135 " <br /> VW-213(P306136-09)Water Sampled 06/09/03 05 18 Received 06/09/03 08 00 R-05 <br /> Gasoline Range Organics ND 250 ugA 5 3060347 06/16/03 06/16/03 EPA <br /> 8015B/8021B <br /> Benzene ND 2 5 " <br /> Toluene ND 2 5 " <br /> Ethylbenzene ND 2 5 " <br /> Xylenes(total) ND 2 5 " <br /> Surrogate a a a-Trifluorotoluene 104% 65-135 " <br /> Surrogate 4-Bromafluorobenzene 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 5 of 15 <br />