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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792.1865 <br /> Analytical <br /> FAX(707)792.0342 <br /> • wwwsequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P312283 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 01/12/04 18:12 <br /> Purgeable Hydrocarbons 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 3120523-EPA 503013,waters <br /> Blank(3120523-BLK1) _ Prepared&Analyzed: 12/18/03 <br /> Gasoline Range Organics ND 50 ug/1 _ ... <br /> Surrogate: 4-Bromofluorobenzene 308 300 103 65-135 <br /> LaboratoryControl Sample_(3120523-BSI) Prepared&Analyzed: 12/18/03 <br /> Gasoline Range Organics 2380 50 ug/l 2750 87 65-135 <br /> Surrogate:4-Brornofluorobenzene 335 300 112 65-135 <br /> Matrix Spike 3120523-MSI Source: P312329-01 Prepared&Analyzed: 12/18/03 <br /> Gasoline Range Organics 2360 50 ugA 2750 45 84 65-135 <br /> Surrogate:4-Bromofluorobenzene 341 300 114 65-135 <br /> Matrix Spike Dup(3120523-MSDI) Source: P312329-01 Prepared&Analyzed: 12/18/03 <br /> Gasoline Range Organics 2300 50 ug/l 2750 45 82 65-135 3 20 <br /> urrogate:4-Bromofluorobenzene 340 300 113 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 its entirety. <br /> Page 27 of 40 <br />