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145 McDowell Blvd,North Ste D <br /> � Sequoia Petaluma CA 94954 <br /> (707)792 1865 <br /> Analytical www <br /> sequ7) labs792 co 2 <br /> www sequmalahs cam <br /> URS Corp-Sacramento Project Arco Site 6I00,Tracy, CA P305120 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA, 95833 Protect 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 5030B,waters/EPA 8015B-VOA <br /> Blank(5050093-BLKI) Prepared&Analyzed 05/I7/05 <br /> Gasoline Range Organics(C4-C 12) ND 50 mg/in'Air <br /> Gasoline Range Organics(C4-C12) ND 14 ppmv <br /> Surrogate 4-Bromofluarobenzene 375 419 89 65-135 <br /> Surrogate 4-Bromofluorobenzene 269 mg/m'Air 300 90 65-135 <br /> I <br /> Laboratory Control Sample(5050093-BSI) Prepared&Analyzed 05/17/05 <br /> Gasoline 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/m'Arr 300 99 65-135 <br /> AlWhatrix Spike(5050093-ivISI) Source P505113-08 Prepared 05/17/05 Analyzed 05/18/05 <br /> olme Range Organics(C4-C 12) 18500 280 ppmv 15600 5100 86 65-135 <br /> Gasoline Range Organics(C4-C 12) 65200 1000 mg/m'Air 55000 18000 86 65-135 <br /> Surrogate 4-Bromofluorobenzene 298 1300 99 65-135 <br /> Surrogate 4-Bromafluorobenzene 417 ppmv 419 100 65-135 <br /> Matrix Spike Dup(5050093-iV1SDI) 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/ml Ar 55000 18000 84 65-135 2 20 <br /> Surrogate 4-Bromofluorobenzene 300 11300 100 65-135 <br /> Surrogate 4-Bromofluarobenzene 419 ppmv 419 100 65-135 <br /> o <br /> quoia Analytical -Petaluma The results in ihts report apply to the samples analyzed in accordance wrth the chain of <br /> custody document Unless othenvise stated results are reported on a ivet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 7of11 <br />