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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> • `1 (707)792-1865 <br /> Analytical FAX sequoi792-0342 <br /> www equoialabs com <br /> • <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P405290 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/02/04 19 44 <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 4050532-EPA 5030B waters <br /> Blank(4050532-BLKI) Prepared&Analyzed 05/22/04 <br /> Gasoline Range Organics(C4-C12) ND 50 ugR <br /> Surrogate 4-Bromofluorobenzene 329 300 110 65-135 <br /> Laboratory Control Sample(4050532-BSI) Prepared&Analyzed 05/22/04 <br /> Gasoline Range Organics(C4-C12) 2490 50 ugll 2750 91 65-135 <br /> Surrogate 4-Bromofluorobenzene 338 300 113 65-135 <br /> Matrix Spike(4050532-MSI) Source P405290-02 Prepared&Analyzed 05/22/04 <br /> Gasoline Range Organics(C4-C12) 2330 50 ug/I 2750 ND 85 65-135 <br /> Surrogate 4-Bromofluorobenzene 327 300 109 65-135 <br /> Matrix Spike Dup(4050532-MSDI) Source P405290-02 Prepared&Analyzed 05/22/04 <br /> Gasoline Range Organics(C4-C 12) 2490 50 ugA 2750 ND 91 65-135 7 20 <br /> Surrogate 4-Bromoj7uorobenzene 328 300 109 65-135 <br /> Batch 4050533-EPA 5030B waters <br /> Blank(4050533-BLKI) Prepared&Analyzed 05/21/04 <br /> Gasoline Range Organics(C4-C 12) ND 50 ugll <br /> Surrogate 4-Bromofluorobenzene 307 300 102 65-135 <br /> Laboratory Control Sample(4050533-BSI) Prepared&Analyzed 05/21/04 <br /> Gasoline Range Organics(C4-C12) 2370 50 ugh 2750 86 65-135 <br /> Surrogate 4-Bromofluorobenzene 324 300 108 65-135 <br /> Matrix Spike(4050533-MSI) Source P405215-03 Prepared&Analyzed 05/21/04 <br /> Gasoline Range Organics(C4-C I2) 249000 5000 ugfl 275000 9100 87 65-135 <br /> Surrogate 4-Bromofluorobenzene 316 11300 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 entirety <br /> Page I1 of 17 <br />