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COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> Client ARCO Products Company Service Request. 59700930 <br /> Project 21775-234 002/TO#21333 0012168 STOCKTON Date Collected NA <br /> Sample Matra Water Date Received NA <br /> Date Extracted NA <br /> Date Analyzed 5/30/97 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> TPH as Gasoline <br /> Sample Name BATCH QC Units ug/L(ppb) <br /> Lab Code S9700932-001 MS, S9700932-001 DMS Basis NA <br /> Test Notes <br /> Percent Recovery <br /> CAS Relative <br /> Prep Analysis Space Level Sample Spice Result Acceptance Percent Result <br /> Analyte Method Method MRL MS DMS Result MS DMS MS DMS Limits Difference Notes <br /> Gasoline EPA 5030 CA/LUFT 50 250 250 ND 250 230 100 92 75-135 8 <br /> OMS/020597p <br /> Page 16 <br />