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1455 NEcDowell Blvd, <br /> Sequoia PeNorth Ste <br /> tafuma,GA94954 <br /> (707)792-1865 <br /> Analytical FAX(707)742-0342 <br /> www sequoialabs com <br /> I <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P312396 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Clarth 01/09/04 18 12 <br /> Purgeable Hydrocarbons by EPA 8015B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %RUC _ RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3120548-EPA 5030E waters <br /> Blank(3120548-BLKI) Prepared&Analyzed 12/19/03 <br /> Gasoline Range Organics ND 50 ugA <br /> Surrogate 4-Bromofluorobenzene 273 300 91 65-135 <br /> Laboratory Control Sample(3120548-BSI) Prepared&Analyzed 12/19/03 <br /> Gasoline Range Organics 2120 50 ug/1 2750 77 65-135 <br /> Surrogate 4-Bromofluorobenzene 304 300 101 65-135 <br /> Matrix Spike(3120548-MSI) Source P312406-01 Prepared&Analyzed 12/19/03 <br /> Gasoline Range Organics 33900 500 ugA 27500 13000 76 65-135 <br /> Surrogate 4-Bromofluorobenzene 292 300 97 65-135 <br /> Matrix Spike Dup(3120548-MSDI) Source P312406-01 Prepared&Analyzed 12/19/03 <br /> Adilloqn1inp Range Organics 34100 500 ugl 27500 13000 77 65-135 06 20 <br /> rogate 4-Bromof7uorobenzene 287 300 96 65-135 <br /> Batch 3120549-EPA 50308 waters <br /> Blank(3120549-BLKI) Prepared&Analyzed 12/19/03 <br /> Gasoline Range Organics ND 50 ugA <br /> Surrogate 4-Bromofluorobenzene 319 300 106 65-135 <br /> Laboratory Control Sample(3120549-BSI) Prepared&Analyzed 12/19/03 <br /> Gasoline Range Organics 2340 50 ugA 2750 85 65-135 <br /> Surrogate 4-Bromofluorobenzene 340 300 113 65-135 <br /> Matrix Spike(3120549-MSI) Souree P312396-05 Prepared&Analyzed 12/19/03 <br /> Gasoline Range Organics 2320 50 ug/l 2750 ND 84 65-135 <br /> Surrogate 4-Bromofluorobenzene 327 300 109 65-135 <br /> quota 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 10 of 17 <br />