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• 1455 McDowell Blvd,North Ste D <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (707)792-1965 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs cwm <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P503073 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/16/05 14 19 <br /> Purgeable Hydrocarbons by EPA 8015B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %RRC RPD <br /> Analyte Result Limit Urals Level Result %REC Limits RPD Limit Notes <br /> Batch 5030132-EPA 5030B,waters/EPA 8015B-VOA <br /> Matrix Spike Dup(5030132-MSDI) Source P503073-10 Prepared&Analyzed 03111/05 <br /> Gasoline Range Organics(C4-C 12) 2250 50 ug/l 2750 ND 82 609-120 3 20 <br /> Surrogate 4-Bromofluorobenzene 270 300 90 80-110 <br /> Sequoia Analytical -Petaluma The results to this report apply to the samples analyzed in accordance with the chair: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 12 of 19 <br />