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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs corn <br /> is <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P411134 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 11/07/04 17 30 <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 4110178- EPA 5030B,waters/EPA 8015B-VOA <br /> Blank(4110178-BLK1) Prepared&Analyzed 11/05/04 <br /> Gasoline Range Organics(C4-C12) ND 14 ppmv <br /> Gasoline Range Organics(C4-C12) ND 50 mg/m'Air <br /> Surrogate 4-Bromofluorobenzene 339 ppmv 419 81 65-135 <br /> Surrogate 4-Bromofluorobenzene 243 mg/m'Air 300 81 65-135 <br /> Laboratory Control Sample(4110178-BSI) Prepared&Analyzed 11/05/04 <br /> Gasoline Range Organics(C4-C12) 2250 50 mg/m'Air 2750 82 65-135 <br /> Gasoline Range Organics(C4-C12) 640 14 ppmv 780 82 65-135 <br /> Surrogate 4-Bromofluorobenzene 361 41 9 86 65-135 <br /> Surrogate 4-Bromofluorobenzene 258 mg/m'Air 300 86 65-135 <br /> Laboratory Control Sample Dup(4110178-BSD1) Prepared&Analyzed 11/05/04 <br /> Range Organics(C4-C12) 2k90 50 mg/m'Atr 2750 80 b5 135 3 20 <br /> Wine <br /> ne Range Organics(C4-C12) 621 14 ppmv 780 80 65-135 3 20 <br /> Surrogate 4-Bromofluorobenzene 256 mg/m'Air 300 85 65-135 <br /> Surrogate 4-Bromofluorobenzene 358 ppmv 419 85 65-135 <br /> �uola 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 5 of 8 <br />