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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client ARCO Produuti ComponN Service S Request:9 - 9700958 <br /> ProleLt 21775-229 003fFO#213;i 00/2130 STOCKTON Date Collected- NA <br /> Sample Matrix %alar <br /> Date Received, NA <br /> Date Extracted- NA <br /> Date Analyzed 612/97 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> TPH as Gasoline <br /> Sample Neme BATCH QC <br /> Units uf/L(ppb) <br /> Lab Code 59700959-002MS S9700959-002DMS Basis NA <br /> Test Notes <br /> Percent Recovery <br /> CAS Relative <br /> prep Analws Spike Level Sample Spike Result Acceptance Percent Resah <br /> Analyte Method Method MRL MS DMS Result MS DMS MS DMS Limits Difference Notes <br /> Gasoline LPA 5030 CA/LUFT 50 250 250 ND 240 270 96 108 75-135 12 <br /> DMS/020507P <br /> Page 20 of 21 <br />