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J <br /> Sequoia 1455 McDowell Blvd North Ste D <br /> Petaluma CA 94954 <br /> Analytical (707)792-1855 <br /> i <br />. Y 1 FAX uoi 792 0342 <br /> www seqequoialabs coni <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P404555 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/13/04 18 04 <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 4050059-EPA 5030,( res 48h) <br /> Blank(4050059-BLKI) Prepared&Analyzed 05/04/04 <br /> Gasoline Range Organics(C4-C 12) ND 1 0 mg/kg <br /> Surrogate 4-Bromofluorobenzene 0 626 0 600 104 65-135 <br /> Laboratory Control Sam le(4050059-BSI) Prepared&Analyzed 05/04/04 <br /> Gasoline Range Organics(C4-C 12) 5 02 10 mg/kg 5 50 91 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 636 0 600 106 65-135 <br /> Matrix Spike 4050059-MS1 Source P404511-01 Prepared&Analyzed 05/04/04 <br /> Gasoline Range Organics(C4-C12) 463 1 0 mg/kg 550 ND 84 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 581 0 600 97 65-135 <br /> Matrix Spike Du 4050059-MSD1 Source P404511-01 Prepared&Analyzed 05/04/04 <br /> Gasoline Range Organics(C4-C 12) 4 65 l 0 mg/kg 5 50 ND 85 65-135 04 20 <br /> Surrogate 4-Bromofluorobenzene 0 579 0 600 96 65-135 <br /> Batch 4050115-EPA 5030B,sotls WWI <br /> Blank(4050115-BLKI) -Prepared&Analyzed 05/05/04 - <br /> Gasoline Range Organics(C4-C12) ND 100 mg/kg <br /> Surrogate, 4-Bromofluorobenzene 305 300 102 65-135 <br /> Laborat2a Control Sample(4050115-BSI) Prepared&Analyzed 05/05/04 <br /> Gasoline Range Organics(C4-C 12) 264 100 mg/kg 275 96 65-135 <br /> Surrogate 4-Bromofluorobenzene 32 4 30 0 108 65-135 <br /> Laboratory Control Sample Du (4050115-ESDI) Prepared&Analyzed 05/05/04 <br /> Gasoline Range Organics(C4 C12) 264 100 mg/kg 275 96 65-135 0 20 <br /> Surrogate 4-Bromofluorobenzene 323 " 300 108 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 I0 of 18 <br />