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' 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,7)792 4954 <br /> 1865 <br /> (707)792 1865 <br /> Analytical FAX(707) 42 <br /> www seyuoialabs com <br /> URS Corp--Sacramento Project Arco Site 6020,Manteca,CA P307347 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36616 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/30/03 17 32 <br /> Total Petroleum Hydrocarbons as Gasoline by EPA 80158- 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 3070447-EPA 5030,soils <br /> Blank(3070447-BLKI) Prepared&Analyzed 07/22/03 <br /> Gasoline Range Organics ND 10 mg/kg <br /> Surrogate 4-Bromofluorobenzene 0 313 0 300 104 65-135 <br /> Laboratory Control Sample(3070447-BSI) Prepared&Analyzed 07/22/03 <br /> Gasoline Range Organics 222 10 mg/kg 275 81 65-135 <br />' Surrogate 4-Bromofluorobenzene 0 312 " 0 300 104 65-135 <br /> Matrix Spike(3070447-MSI) Source P307344-02 Prepared&Analyzed 07/22/03 <br /> Gasoline Range Organics 204 10 mg/kg 275 ND 74 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 306 " 0 300 102 65-135 <br /> Matrix Spike Dup(3070447-MSD1) Source P307344-02 Prepared&Analyzed 07/22/03 <br /> Gasoline Range Organics 193 10 mg/kg 275 ND 70 65-135 6 20 <br /> arrogate 4-Bromofluorobenzene 0 298 0 300 99 65-135 <br /> Batch 3070525-EPA 5030,soils <br />' Blank(3070525-BLK1) Prepared&Analyzed 07/24/03 <br /> Gasoline Range Organics ND 10 mg/kg <br /> Surrogate 4-Bromofluorobenzene 0 315 0 300 105 65-135 <br />' <br /> Laboratory Control Sample(3070525-BSI) Prepared&Analyzed 07/24/03 <br /> Gasoline Range Organics 223 10 mg/kg 275 81 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 319 0 300 106 65-135 <br /> Matrix Spike(3070525-MSI) Source P307417-01 Prepared&Analyzed 07/24/03 <br /> Gasoline Range Organics 200 10 mg/kg 275 0 022 72 65-135 <br /> Surrogate 4-Bromofluorobenzene 0 315 0 300 105 65-135 <br />' Sequoia 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 entirely <br /> Page 8 of 13 <br /> 1 <br />