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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P403321 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/29/04 17 13 <br /> Purgeable Hydrocarbons by EPA 8015B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporhng Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch 4030650-EPA 5030B,waters <br /> Blank(4030650-BLKI) Prepared&Analyzed 03/23/04 <br /> Gasoline Range Organics(C6-C10) ND 50 ug/I - - <br /> Surrogate 4-Bromofluorobenzene 287 300 96 65-135 <br /> Laboratory Control Sample(4030650-BS1) Prepared&Analyzed 03/23/04 <br /> Gasoline Range Organics(C6-C10) 2370 50 ug/l 2750 86 65-135 <br /> Surrogate 4-Bromofluorobenzene 298 300 99 65-135 <br /> Matrix Spike(4030650-MSI) Source P403321-02 Prepared&Analyzed 03/23/04 <br /> Gasoline Range Organics(C6-CIO) 2070 50 ug/1 2750 11 75 65-135 <br /> Surrogate 4-Bromofluorobenzene 303 300 101 65-135 <br /> _Matrix Spike Dui(4030650-MSD1) Source P403321-02 Prepared&Analyzed 03/23/04 - <br /> Gasoline Range Organics(C6-C10) 2330 50 ugll 2750 it 84 65-135 12 20 <br /> ogate 4-Bromofluorobenzene 305 11 300 102 65-135 <br /> V <br /> ota 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 he reproduced in its entirety <br /> Page 10 of 15 <br />