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1455 McDowell Blvd North Ste <br /> Sequoia Petaluma,CA 949544 <br /> 4D (707)792 1865 <br /> Analytical www sequaialabs FAX(707)792-0342ocoin <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P404664 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/17/04 14 05 <br /> Purgeable Hydrocarbons by EPA 8015B - Quality Control <br /> Sequoia Analytical - PetaIuma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lunit Notes <br /> Batch 4050179-EPA 503013,waters <br /> Blank(4050179-BLKI) Prepared&Analyzed 05/07/04 <br /> Gasoline Range Organics(C4-C12) ND 50 ug/1 <br /> Surrogate 4-Bromofluorobenzene 296 300 99 65-135 <br /> Laboratory Control Sample(4050179-BSI) Prepared&Analyzed 05/07/04 <br /> Gasolme Range Organics(C4-C12) 1780 50 ug/l 2750 65 65-135 <br /> Surrogate 4-Bromofluorobenzene 310 300 103 65-135 <br /> Matrix Spike(4050179-MSI) Source P404670-01 Prepared&Analyzed 05/07/04 <br /> Gasoline Range Organics(C4-C12) 2120 50 ug/l 2750 ND 77 65-135 <br /> Surrogate 4-Bromofluorobenzene 309 300 103 65-135 <br /> Matrix Spike Du (4050179-MSD1) Source P404670-01 Prepared&Analyzed 05/07/04 <br /> Gasoline Range Organics(C4-C 12) 2100 50 ug/1 2750 ND 76 65-135 09 20 <br /> Willgote 4-Bromofluorobenzene 313 11300 104 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 6 of 9 <br />