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Sequoia 1455McDowP Blvd,North Ste <br /> Petaluma,CA 949544 <br /> D— (707)792-1865 <br /> ► Analytical FAX(707)792-0342 <br /> www sequmialabs corn <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 - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lump Notes <br /> Batch 3090610-EPA 5030,waters <br /> Blank(3090610-BLKI) Prepared&Analyzed 09/26/03 <br /> Gasoline Range Organics ND 50 ug/1 <br /> Surrogate 4-Bromofluorobenzene 281 300 94 65-135 <br /> Laboratory Control Sample(3090610-BSI) Prepared&Analyzed 09/26/03 <br /> Gasoline Range Organics 2390 50 ug/l 2750 87 65-135 <br /> Surrogate 4-Bromofluorobenzene 298 300 99 65-135 <br /> Matrix Spike(3090610-MSI) Source P309407-01 Prepared&Analyzed 09/26/03 <br /> Gasoline Range Organics 2340 50 ug/I 2750 19 84 65-135 <br /> Surrogate 4-Bromofluorobenzene 299 300 100 65-135 <br /> Matrix Spike Du (3090610-MSDI) Source P309407-01 Prepared&Analyzed 09/26/03 <br /> Gasoline Range Organics 2370 50 ug/I 2750 19 85 65-135 1 20 <br /> �urrngate 4-Bromofluorobenzene 297 300 99 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 12 of 16 <br />