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C 1455 McDowell Blvd North Ste <br /> Sequoia Petaluma CA 949544 <br /> (707)792-1865 <br /> �► 42 <br /> Analytical <br /> FAX SCgU Lalabs Com. www sequoialabs cam <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P505120 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/19/05 11 20 <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 5050093-EPA 503013,waters/EPA 8015B-VOA <br /> Blank(5050093-BLKI) Prepared&Analyzed 05/17/05 <br /> Gasolme Range Organics(C4-C 12) ND 50 mg/m'Air <br /> Gasoline Range Organics(C4-C 12) ND 14 ppmv <br /> Surrogate 4-Bromofluorobenzene 375 11419 89 65-135 <br /> Surrogate 4-Bromofluorobenzene 169 mg/m'Air 300 90 65-135 <br /> Laboratory Control Sample(5050093-BS1) Prepared&Analyzed 05/17/05 <br /> Gasolme Range Organics(C4-C12) 609 14 ppmv 780 78 65-135 <br /> Gasoline Range Organics(C4-C12) 2150 50 mg/ml Air 2750 78 65-135 <br /> Surrogate 4-Bromofluorobenzene 414 ppmv 419 99 65-135 <br /> Surrogate 4-Bromofluorobenzene 296 mg/ml Air 300 99 65-135 <br /> atrix Spike(5050093-MSI) Source P505113-08 Prepared 05/17/05 Analyzed 05/18/05 <br /> solme Range Organics(C4 C12) 18500 280 ppmv 15600 5100 86 65-135 <br /> Gasoline Range Organics(C4 C 12) 65200 1000 mg/ml Air 55000 18000 86 65-135 <br /> Surrogate 4-Bromofluorobenzene 298 " 300 99 65-135 <br /> Surrogate 4-Bromofluorobenzene 417 ppmv 419 100 65-135 <br /> Matrix Spike Dup(5050093-MSDI) Source P505113-08 Prepared 05/17/05 Analyzed 05/18/05 <br /> Gasoline Range Organics(C4-C 12) 18200 280 ppmv 15600 5100 84 65-135 2 20 <br /> Gasoline Range Organics(C4-C 12) 64200 1000 mg/m'Air 55000 18000 84 65-135 2 20 <br /> Surrogate 4-Bromofluorobenzene 300 300 100 65-135 <br /> Surrogate 4 Bromofluorobenzene 419 ppmv 41 9 100 65-135 <br /> Sequoia Analytical Petaluma re apply to the samples analyzed in accordance with the chain of <br /> a yttcal-Peta The results in this report PPY <br /> custody document Unless otherwise slated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 7 of 11 <br />