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1455 McDowell Blvd,North Ste D <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (747)792-1865 <br /> Analytical FAX(701)792-0342 <br /> www sequolalabs com <br /> • <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P406072 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/17/04 17 27 <br /> Purgeable Hydrocarbons by EPA 8015B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limn Notes <br /> Batch 4FO9024-FPA 5030B (PITT <br /> Blank(4F09024-BLK1) Prepared&Analyzed: 06/09/04 <br /> Gasoline Range Organics(C4-C12) ND 50 ug/l <br /> Surrogate 4-Bromofluorobenzene 355 400 888 70-130 <br /> Laboratory Control Sample(4F09024-BS2) Prepared&Analyzed 06/09/04 <br /> Gasoline Range Organics(C4-C 12) 276 50 ug/l 250 110 62-134 <br /> Surrogate 4-Bromofluorobenzene 379 400 948 70-130 <br /> Matrix Spike(4F09024-MSI) Source P406072-02 Prepared&Analyzed 06/09/04 <br /> Gasoline Range Organics(C4-C12) 721 50 ug/l 550 260 838 62-134 <br /> Surrogate 4-Bromofluorobenzene 465 400 116 70-130 <br /> Matrix Spike Dup(4F09024-MSD1) Source P406072-02 Prepared&Analyzed 06/09/04 <br /> Gasoline Range Organics(C4-C 12) 781 50 ug/l 550 260 947 62-134 799 41 <br /> Wurragate 4-Bromofluorobenzene 466 11400 116 70-130 <br /> Sequoia Analytical-Petaluma 77re 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 6 of 11 <br />