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1455 McDowell Blvd North Ste D <br /> 4DSequoia Petaluma CA 94954 <br /> � FAX Analytical (707)192-1865 <br /> 707 '792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P402493 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/17/04 15 30 <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 4020587-EPA 5030,soils <br /> Blank(4020587-BLKI) Prepared&Analyzed 02/26/04 _ <br /> Gasoline Range Organics ND 1 0 mg/kg <br /> Surrogate 4-Bromofluorobenzene 0 284 0 300 95 65-135 <br /> a orator Control Sample(4020587-BSl) Prepared_ &Analyzed 02/26/04 <br /> Gasoline Range Organics 2 55 10 mg/kg 2 75 93 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 291 0 300 97 65-135 <br /> Matrix Spike(4020587-MS1) Source P402415-10 Prepared&Analyzed 02/26/04 _ <br /> Gasolme Range Organics 244 10 mg/kg 2 75 0 030 88 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 274 0 300 91 65-135 <br /> Matrix-Spike Dup(4020587-MSD1) Source P402415-10 Prepared&Analyzed 02/26/04 <br /> Gasoline Range Organics 245 10 mg/kg 2 75 0 030 88 65-135 04 20 <br /> ogare 4-Bromofluorobenzene 0 269 0 300 90 65-135 <br /> Batch 4020620-EPA 5030,soils <br /> Blank(4020620-BLKI) Prepared&Analyzed 02/27/04 <br /> Gasoline Range Organics ND 1 0 mg/kg <br /> Surrogate 4-Bromofluorobenzene 0 283 0 300 94 65-135 <br /> Laboratory Control Sample(4020620-BS1) Prepared&Analyzed 02/27_/04 _ <br /> Gasoline Range Organics 244 10 mg/kg 2 75 89 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 288 0 300 96 65-135 <br /> Matrix Spike_(4020620-MS1) Source P402493-01 Prepared&Analyzed 02/27/04 <br /> Gasoline Range Organics 1 97 1 0 mg/kg 2 75 0 18 65 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 231 0 300 77 65-135 <br /> 0uoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 12 of 25 <br />