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4D1455 McDowell Blvd North Ste <br /> Sequoia owPetaluma,CA 949544 <br /> D4 <br /> (707)792 1865 <br /> IW Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs corn <br /> 0 <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P309407 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm 50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/03 16 58 <br /> Total Petroleum Hydrocarbons as Gasoline by EPA 8015B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Lnnit Units Dilution Batch Prepared Analyzed Method Notes <br /> ATR-1 (P309407-01)Water Sampled 09/18/03 14 00 Received 09/19/03 15 25 <br /> Gasoline Range Organics ND 50 ug/1 1 30906I0 09/26/03 09/26/03 EPA <br /> 8015B-VOA <br /> Surrogate 4-Bromofluorobenzene 86% 65-135 " <br /> ATR-2(P309407-02)Water Sampled 09/18/03 14 40 Received 09/19/03 15 25 <br /> Gasoline Range Organics ND 50 ug/l 1 3090610 09/26/03 09/26/03 EPA <br /> 8015B-VOA <br /> Surrogate 4-Bromof7uorobenzene 92% 65-135 " <br /> ATR-3(P309407-03)Water Sampled 09/18/03 14 20 Received 09/19/03 15 25 <br /> Gasoline Range Organics 70 50 ug/I 1 3090610 09/26/03 09/26/03 EPA <br /> 8015B-VOA <br /> Surrogate 4-Bromofluorobenzene 98% 65-135 " <br /> ATR4(P309407-04)Water Sampled 09/18/03 13 20 Received 09/19/03 15 25 <br /> asoline Range Organics ND 50 ug/1 1 3090610 09/26/03 09/26/03 EPA <br /> 801513-VOA <br /> Surrogate 4-Bromofluorobenzene 86% 65-135 " <br /> ATR-5(P309407-05)Water Sampled 09/18/03 11 25 Received 09/19/03 15 25 <br /> Gasoline Range Organics 53 50 ug/l 1 3090610 09/26/03 09/26/03 EPA HC-19 <br /> 8015B-VOA <br /> Surrogate 4-Bromofluorobenzene 93% 65-135 " <br /> ATR-6(P309407-06)Water Sampled 09/18/0311 00 Received 09/19/03 15 25 <br /> Gasoline Range Organics ND 50 ug/l 1 3090610 09/26/03 09/26/03 EPA <br /> 8015B-VOA <br /> Surrogate 4-Bromofluorobenzene 94% 65-135 " <br /> ATR-7(P309407-07)Water Sampled 09/18/03 10 40 Received 09/19/03 15 25 <br /> Gasoline Range Organics ND 50 ag/1 1 3090610 09/26/03 09/26/03 EPA <br /> 8015B-VOA <br /> Surrogate 4-Bromofluorobenzene 91 % 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 3 of 16 <br />