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1455McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> ,Z_ (707)7921865 <br /> Analytical FAX(707)7920342 <br /> www sequoralabs cont <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/18/05 11 34 <br /> Purgeable Hydrocarbons by EPA 8015B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %uREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5010041-EPA 5030B,waters/EPA 8015B-VOA <br /> Laboratory Control Sample(5010041-BSI) Prepared&Analyzed 01/04/05 <br /> Gasoline Range Organics(C4-C12) 2600 50 ug/1 2750 95 67-101 <br /> Surrogate 4-Bromofluorobenzene 303 300 101 80-110 <br /> Matrix Spike(5010041-MSI) Source P412401-04 Prepared 01/04/05 Analyzed 01/05/05 <br /> Gasoline Range Organics(C4-C12) 3600 50 ugll 2750 ND 131 67-101 LM <br /> Surrogate 4-Bromofluorobenzene 300 304 100 80-110 <br /> Matrix Spite Dup(5010041-MSD1) Source P412401-04 Prepared 01/04/05 Analyzed 01/05/05 <br /> Gasoline Range Organics(C4-C12) 3590 50 ug/l 2750 ND 131 67-101 0 3 20 LM <br /> Surrogate 4-Bromofluorobenzene 300 300 100 80-110 <br /> Sequoia Analytical-Petaluma The results to 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 /> P g <br /> This analytical report must be reproduced to its entirety <br /> i <br /> Page 19 of 33 <br />