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i <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 1865 <br /> � Analytical FAX(707707 )792 792 0334242 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P307344 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36616 Reported <br />' Sacramento CA,95833 Project Manager Vernon P Elarth 07/28/03 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 Limit Notes <br /> Batch 3070447-EPA 5030,soils <br /> Blank 3070447-BLKI Prepared&Anal zed 07/22/03 <br /> Gasoline Range Organics ND I 0 mg/kg <br /> Surrogate 4-Bromofluorobenzene 0 313 0 300 104 65-135 <br /> Laboratory Control Sample 3070447-BSl Prepared&Analyzed 07/22/03 <br /> Gasoline Range Organics 222 10 mg/kg 275 81 65-135 <br /> Surrogate 4-Bromo luorobenzene 0 312 0 300 104 65-135 <br /> Matrix Spike 3070447-MSl Source P307344-02 Prepared&Analyzed 07/22/03 <br /> Gasoline Range Organics 2 04 1 0 mg/kg 275 ND 74 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 306 0 300 102 65-135 <br /> Matrix Spike Du (3070447-MSD1) Source P307344-02 Prepared&Analyzed 07/22/03 <br /> —Gasoline Range Organics 1 93 1 0 mg/kg 2 75 ND 70 65-135 6 20 <br /> urrogate 4-Bromofluorobenzene 0 298 0 300 99 65-135 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> bases This analytical report must be reproduced in its entirety <br /> Page 10 of 14 <br />