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41) Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> 1r Analytical (707)792-1865 <br /> FAX(707)792 0342 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P305040 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36616 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/15/03 20 19 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 801513/802113 <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-8 P305040-04 Water Sampled 04/28/03 15 55 Received 05/01/03 16 00 <br /> Gasoline Range Organics ND 50 ug/] 1 3050178 05/07/03 05/07/03 EPA <br /> 8015B/8021B <br /> Benzene ND 050 " ^ <br /> Toluene ND 0 50 ^ <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " ^ <br /> Surrogate a a a-Trijluorotoluene 105% 65-135 „ <br /> Surrogate 4-Bromofluorobenzene 101 % 65-135 " <br /> MW-9 305040-05Water Sampled 04/28/03 15 45 Received 05/01/03 16 00 <br /> Gasoline Range Organics ND 50 up/l 1 3050178 05/07/03 05/07/03 EPA <br /> 8015B/8021 B <br /> Benzene ND 050 " ^ <br /> Toluene ND 050 " ^ <br /> Ethylbenzene ND 0 50 ^ „ <br /> ylenes(total) ND 050 <br /> rrogate a a a-Trifluorotoluene 101 % 65-135 <br /> Surrogate 4-Bromofluorobenzene 100% 65-135 <br /> MW-10 P305040-06 Water Sam led 04/28/03 15 20 Received 05/01/03 16 00 <br /> Gasoline Range Organics ND 50 ug/1 1 3050178 05/07/03 05/07/03 EPA <br /> 8015B/8021B <br /> Benzene ND 050 <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 0 50 <br /> Xylenes(total) ND 0 50 <br /> Surrogate a a a-Trifluorotoluene 100% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 103% 65-135 " » <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the Chain <br /> . of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in ifs entirety <br /> Page 4 of 12 <br />