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" 1455 McDowell Blvd North Ste D <br /> L \ Sequoia Petaluma,CA 94954 <br /> ��� (707)792-1665 <br /> �� Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 434,Lodi,CA P306214 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim 50433 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/16/03 16 01 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result 1.11110 Units Dilution Batch Prepared Analyzed Method Not <br /> W-1A(P306214-01)Water Sampled 06/11/03 09 40 Received 06/12/03 11 30 <br /> Gasoline Range Organics ND 50 ug/l 1 3060316 06/13/03 06/13/03 EPA 8015B/ <br /> 8021B <br /> Benzene ND 050 <br /> Toluene ND 050 <br /> ElhyIbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a,a,a-Trifluorotoluene 101 % 65-135 " <br /> Surrogate 4-Bromofluorobenzene 102% 65-135 " <br /> W-2(P306214-02)Water Sampled 06/11/03 10 50 Received 06/12/03 11 30 <br /> Gasoline Range Organics ND 50 ug/l 1 3060316 06/13/03 06/13/03 EPA 8015B/ <br /> 8021B <br /> Benzene ND 050 " <br /> Toluene ND 050 <br /> Ethylbenzene ND 0 50 <br /> ylenes(total) 0 90 0 50 " <br /> Surrogate aa a-Trifluorotoluene 98% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 94% 65-135 » <br /> W-2A(P306214-03)Water Sampled 06/11/03 10 30 Received 06/12/03 11 30 <br /> Gasoline Range Organics 180 50 ug/l 1 3060316 06/13/03 06/13/03 EPA 9015B/ <br /> 8021B <br /> Benzene 5 7 0 50 <br /> Toluene 28 050 <br /> Ethylbenzene 8 2 050 " <br /> Xylenes(total) 6 9 0 50 <br /> Surrogate a a a-Trifluorotoluene 100% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 97% 65-135 " <br /> Analytical-Petaluma The results m this report apply to the samples analyzed in accordance with the chain of <br /> ,Sequoia <br /> custody document Unless otherwise stated results are reported on a wet weight bases <br /> This analytical report must be reproduced in its entirety <br /> Page 3 of 10 <br />