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1455 McDowell Blvd North Ste D <br /> (1) Sequoia Petaluma CA 94954 <br /> (707)792 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs cum <br /> URS Corp- Sacramento Project Arco Site 6100,Tracy,CA P404510 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/05/04 18 51 <br /> Purgeable Hydrocarbons by EPA 8015B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %Rue RPD <br /> Analyte Result Limit Units Level Result %nREC Limits RPD Limit Notes <br /> Batch 4040601 - EPA 5030,soils <br /> Blank(4040601-BLK1) Prepared&Analyzed 04/23/04 <br /> Gasoline Range Organics(C4-C12) ND 010 mg/kg <br /> Surrogate 4-Brom0fluorobenzene 0 267 0 300 89 65-135 <br /> Laboratory Control Sample(4040601-BSI) Prepared&Analyzed 04/23/04 <br /> Gasoline Range Organics(C4-C12) 1 79 010 mg/kg 2 75 65 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 276 0 300 92 65-135 <br /> Matrix Spike(4040601-MS1) Source P404492-06 Prepared&Analyzed 04/23/04 <br /> Gasoline Range Organics(C4-C12) 209 10 mg/kg 27 5 17 70 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 313 0 300 104 65-135 <br /> Matrix Spike Dup(4040601-MSDI) Source P404492-06 Prepared&Analyzed 04/23/04 <br /> Gasoline Range Organics(C4-C12) 208 10 mg/kg 275 17 69 65-135 05 20 <br /> gale 4-Bromofluorobenzene 0 311 0 300 104 65-135 <br /> Batch 4040725- EPA 5030,soils <br /> Blank(4040725-BLK1) Prepared&Analyzed 04/28/04 <br /> Gasoline Range Organics(C4-C12) ND 050 mg/kg <br /> Surrogate 4-Bromofluorobenzene 0 306 0 300 102 65-135 <br /> Laboratory Control Sample(4040725-BSI) Prepared&Analyzed 04/28/04 <br /> Gasoline Range Organics(C4-C12) 244 050 mg/kg 275 89 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 318 0 300 106 65-135 <br /> Matrix Spike(4040725-MSI) Source P404367-05 Prepared&Analyzed 04/28/04 <br /> Gasoline Range Organics(C4-C12) 503 10 mg/kg 550 ND 91 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 287 110 300 96 65-135 <br /> oia Analytical - Petaluma The results to 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 werght basis <br /> This analytical report must be reproduced in its entirety <br /> Page 11 of 17 <br />