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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> 792 1865 <br /> Analytical FAX(707)792.0342 <br /> www sequoiequoialabs corn <br /> 1p, <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P412284 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/13/05 08 48 <br /> Purgeable Hydrocarbons by EPA 8015B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %EIEC RPD <br /> Analyte Result Limit Units level Result %REC Limits RPD Limit Notes <br /> Batch 4120469-EPA 5030B,waters/EPA 8015E-VOA <br /> Blank(4120469-BLKI) Prepared&Analyzed 12/22/04 <br /> Gasoline Range Organics(C4-C12) ND 50 ugA <br /> Surrogate 4-Bromofluorobenzene 265 300 88 80110 <br /> Laboratory Control Sample(4120469-BSI) Prepared&Analyzed 12/22/04 <br /> Gasoline Range Organics(C4-C 12) 2280 50 ug/l 2750 83 67 101 <br /> Surrogate 4-Bromofluorobenzene 307 11300 102 80-110 <br /> Matrix Spike(4120469-MSI) Source P412205-06 Prepared&Analyzed 12/22/04 <br /> Gasoline Range Organics(C4-C 12) 48300 1000 ug/l 55000 3000 82 67-101 <br /> Surrogate 4-Bromofluorobenzene 310 " 300 103 80-110 <br /> Matrix Spike Dup(4120469-MSDI) Source P412205-06 Prepared&Analyzed 12/22/04 <br /> Gasoline Range Organics(C4-C12) 47700 1000 ug/l 55000 3000 81 67-101 1 20 <br /> 1111Wurrogate 4-Bromofluorobenzene 311 " 300 104 80-110 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to 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 to its entirety <br /> Page 6 of 1 I <br />