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1455 McDowell Blvd North Ste D <br /> Sequoiaa_ _� --- -- — - - -- -- Petaluma CA 94954 <br /> —(707)792 1865 <br /> Analytical <br /> - <br /> Lica/ - FAX(707)792 0342 <br /> www sequoialabs com <br /> URS Corp- Sacramento Project Arco Site 6100,Tracy,CA P411271 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay JohnSOn 11/15104 13 28 <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 4110338- EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(4110338-BLKI) Prepared&Analyzed 11/12/04 <br /> Gasoline Range Organics(C4-C12) ND 14 ppmv <br /> Gasoline Range Organics(C4-C12) ND 50 mg/m'Air <br /> Surrogate 4-Bromofluorobenzene 413 ppmv 419 99 65-135 <br /> Surrogate 4-Bromofluorobenzene 196 mg/miAir 300 99 65-135 <br /> Laboratory Control Sample(4110338-BSI) Prepared&Analyzed 11/12/04 <br /> Gasoline Range Organics(C4-C12) 2500 50 mg/ml Air 2750 91 65-135 <br /> Gasoline Range Organics(C4-C12) 710 14 ppmv 780 91 65-135 <br /> Surrogate 4-Bromofluorobenzene 452 11419 108 65-135 <br /> Surrogate 4-Bromofluorobenzene 324 mg/m'Air 300 108 65-135 <br /> Matrix Spike(4110338-MSI) Source P411084-08 Prepared&Analyzed 11/12/04 <br /> M...Range Organics(C4-C12) 684 14 ppmv 780 ND 88 65-135 <br /> IgWline Range Organics(C4-C12) 2410 50 mg/ml Air 2750 ND 88 65-135 <br /> Surrogate 4-Bromofluorobenzene 441 ppmv 419 105 65-135 <br /> Surrogate 4-Bromofluorobenzene 316 mg/m'Air 300 105 65-135 <br /> Matrix Spike Dup(4110338-MSD1) Source P411084-08 Prepared&Analyzed 11/12/04 <br /> Gasoline Range Organics(C4-C12) 689 14 ppmv 780 ND 88 65-135 07 20 <br /> Gasoline Range Organics(C4-C12) 2430 50 mg/ml Air 2750 ND 88 65-135 08 20 <br /> Surrogate 4-Bromofluorobenzene 450 ppmv 419 107 65-135 <br /> Surrogate 4-Bromofluorobenzene 321 mg/m'Arr 300 107 65-135 <br /> nota 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 10 <br />