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1455 McDowell Blvd North Ste D <br /> • <br /> Sequoia Petaluma CA 94954 <br /> (747)792 1865 <br /> FAX(747)792 0342 <br /> Analytical www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P406422 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 07/15/04 10 23 <br /> Purgeable Hydrocarbons by EPA 8O15B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Leve! Result %REC Limas RPD Limit Notes <br /> Batch 4060622-EPA 5030B,waters <br /> Blank(4060622-BLK1) Prepared&Analyzed 06/29/04 <br /> Gasoline Range Organics(C4-C 12) ND 50 ug/I <br /> Surrogate 4-Bramofluorobenzene 274 300 91 65-135 <br /> Laboratory Control Sample(4060622-BS1) Prepared&Analyzed 06/29/04 <br /> Gasoline Range Organics(C4-C12) 2020 50 ug/l 2750 73 65-135 <br /> Surrogate 4-Bromofluorobenzene 284 300 95 65-135 <br /> Matrix Spike(4060622-MSI) Source P406422-04 Prepared&Analyzed 06/29/04 <br /> Gasoline Range Organics(C4-C12) 271000 5000 ug/l 275000 71000 73 65-135 <br /> Surrogate 4-Bromofluorobenzene 280 300 93 65-135 <br /> Matrix Spike Dup(4060622-MSDI) Source P406422-04 Prepared&Analyzed 06/29/04 <br /> line Range Organics(C4-C12) 265000 5000 ug/l 275000 71000 71 65-135 2 20 <br /> -1111111111logate 4-Bromofluorobenzene 289 300 96 65-135 <br /> Batch 4060651 - EPA 5030B,waters <br /> Blank(4060651-BLK1) Prepared&Analyzed 06/30/04 <br /> Gasoline Range Organics(C4-C 12) ND 50 ug/I <br /> Surrogate 4-Bromofluorobenzene 283 300 94 65-135 <br /> Laboratory Control Sample(4060651-BSI) Prepared&Analyzed 06/30/04 <br /> Gasoline Range Organics(C4-C12) 1940 50 ug/l 2750 71 65-135 <br /> Surrogate 4-Bromofluoroberaene 274 300 91 65-135 <br /> Matrix Spike(4060651-MS1) Source P406451-07 Prepared&Analyzed 06/30/04 <br /> Gasoline Range Organics(C4-C12) 1890 50 ug/i 2750 ND 69 65-135 <br /> Surrogate 4-Bromofluorobenzene 277 " 300 92 65-135 <br /> uoia 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 l 1 of 18 <br />