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1455 McDowell Blum,North Ste D <br /> Sequoia Petaluma, <br /> a— ) ` 707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> i� www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P306156 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36588 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/25/03 17 01 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Ana]yte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> ATR-2(P306156-01)Water Sampled 06/09/03 12 00 Received 06/10/03 09 05 <br /> Gasoline Range Organics ND 50 ug/I 1 3060348 06/16/03 06/16/03 EPA <br /> 8015BI8021B <br /> Benzene ND 0 50 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trtfluorotoluene 101 % 65-135 " <br /> Surrogate 4-Bromofluorobenzene 99% 65-135 " <br /> ATR-4(P306156-02)Water Sampled 06/09/03 10 35 Received 06/10/03 09 05 <br /> Gasoline Range Organics ND 50 ug/I t 3060348 06/16/03 06/16/03 EPA <br /> 8015B/802]B <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> methylbenzene ND 0 50 <br /> Xylenes(total) 066 0 50 <br /> Surrogate a a a-Tr fluorotoluene 99% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 100% 65-135 " <br /> ATR-5(P306156-03)Water Sampled 06/09/03 10 55 Received 06/10/03 09 05 <br /> Gasoline Range Organics ND 50 ug/l 1 3060348 06/16/03 06/16/03 EPA <br /> 8015B/802IB <br /> Benzene ND 050 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trifluorotoluene 102% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 101 % 65-135 " <br /> I <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 12 <br />