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1455 McDowell Blvd North Ste D <br /> Petaluma CA 94954 <br /> (D Sequoia (707)792-1865 <br /> Analytical FA3{equoi labsc42 <br /> unvw sequoialahs cam <br /> 0 <br /> URS Corp- Sacramento Project Arco Site 6100,Tracy,CA P410118 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA, 95833 Project Manager Jay Johnson 10/11/04 15 36 <br /> Purgeable Hydrocarbons by EPA 8015B - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %R-EC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4100138-EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(4100138-BLKI) Prepared&Analyzed 10/07/04 <br /> Gasoline Range Organics(C4-C12) ND 14 ppmv <br /> Gasoline Range Organics(C4-C 12) ND 50 mg/ml Air <br /> Surrogate 4-Bromofluorobenzene 282 11300 94 65-135 <br /> Surrogate 4-Bromofluorobenzene 394 ppmv 419 94 65-135 <br /> Laboratory Control Sample(4100138-BS1) Prepared&Analyzed 10/07/04 <br /> Gasoline Range Organics(C4-C12) 745 14 ppmv 780 96 65-135 <br /> Gasoline Range Organics(C4-C 12) 2620 50 mg/ml Air 2750 95 65-135 <br /> Surrogate 4-Bromofluorobenzene 411 ppmv 419 98 65-135 <br /> Surrogate 4-Bromofluorobenzene 294 mg/mJ Air 300 98 65-135 <br /> Matrix Spike(4100138-MSI) Source P410042-01 Prepared&Analyzed 10/07/04 <br /> Wne Range Organics(C4-C12) 2444 50 mglm'Air 2750 ND 89 65-135 <br /> ne Range Organics(C4-C 12) 693 14 ppmv 780 ND 89 65-135 <br /> Surrogate 4-Bromofluorobenzene 290 mglm'Air 300 97 65-135 <br /> Surrogate 4-Bromofluorobenzene 405 ppmv 41 9 97 65-135 <br /> Matrix Spike Dup(4100138-MSD1) Source P410042-01 Prepared&Analyzed 10/07/04 <br /> Gasoline Range Organics(C4-C12) 682 14 ppmv 780 ND 87 65-135 2 20 <br /> Gasoline Range Organics(C4-C 12) 2400 50 mglml Air 2750 ND 87 65-135 2 20 <br /> Surrogate 4-Bromofluorobenzene 388 ppmv 419 93 65-135 <br /> Surrogate 4-Bromof7uorobenzene 278 mglm'rltr 300 93 65-135 <br /> oia Analytical- Petaluma The results in this report apply to the samples analyaed in accordance with the chain of <br /> custody document Unless otherwise stated resulls are reported on a tvet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 5 of 9 <br />