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"} 1455 McDowell Blvd,North Ste 4 <br /> a— ) <br /> Sequoia Petaluma, <br /> (707)792865 <br /> Analytical FAX(767)792 0342 <br /> . www sequotalabs 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 /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> ATR-7(P306156-04)Water Sampled 06/09/03 11 15 Received 06/10/03 09 05 <br /> Gasoline Range Organics ND 50 ug4 1 3060383 06/17/03 06/17/03 EPA <br /> 8015B/8021B <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate a a a-Trifluorotoluene 100% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 103% 65-135 " <br /> ATR-8(P306156-05)Water Sampled 06/09/03 12 30 Received 06/10/03 09 05 <br /> Gasoline Range Organics 220 50 ug/l 1 3060383 06/17/03 06/17/03 EPA <br /> 801581802113 <br /> Benzene ND 050 " <br /> Toluene 0 61 0 50 QR-04 <br /> Wthylhenzene 1 9 050 <br /> ylenes(total) ND 0 50 " <br /> Surrogate a a a-Trifluoro toluene 94% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 109% 65-135 " <br /> ATR-12(P306156-06)Water Sampled.06/09/03 11 35 Received 06/10/03 09 05 <br /> Gasoline Range Organics ND 50 ug/a 1 3060383 06/17/03 06/17/03 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 99% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 104% 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 4 of 12 <br />