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j1455 McDowell Blvd North Ste D <br /> / \ Sequoia Petaluma, 94954 <br /> (707)79 2-1865 <br /> Analytical FAX 792-03 <br /> www sequoiequoialabs corn <br /> • <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P406056 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/14/04 20 24 <br /> Purgeable Hydrocarbons by EPA 8015B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source '/oREC RPD <br /> Analyte Result Limn Units Level Result %REC Limits RPD Lunit Notes <br /> Batch 4060139-EPA 5030B waters <br /> Blank(4060139-BLKI) Prepared&Analyzed 06/07/04 <br /> Gasoline Range Organics(C4-C 12) ND 50 ug/l <br /> Surrogate 4 Bromofluorobenzene 315 300 105 65-135 <br /> Laboratory Control Sample(4060139-BS1) Prepared&Analyzed 06/07/04 <br /> Gasoline Range Organics(C4-C12) 2730 50 ugll 2750 99 65-135 <br /> Surrogate 4-Bromofluorobenzene 327 300 109 65-135 <br /> Matrix Spike(4060139-MSI) Source P405540-06 Prepared&Analyzed 06/07/04 <br /> Gasoline Range Organics(C4-C 12) 2720 50 ug/i 2750 ND 99 65-135 <br /> Surrogate 4-Bromofluorobenzene 314 300 108 65-135 <br /> Matrix Spike Dup(4060139-MSDI) Source P495540-06 Prepared&Analyzed 06/07/04 <br /> Gasoline Range Organics(C4-C12) 2640 50 ugll 2750 ND 96 65-135 3 20 <br /> �urrogate 4-BromoJluarobenzene 321 300 107 65-135 <br /> Sequoia Analytical-Petaluma Vie results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise staled results are reported on a wet weight basis <br /> 0 This analytical report must be reproduced in its entirety <br /> Page IS of 20 <br />