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COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request: 59501597 <br /> Protect: 1775-229 001 /TO# 17075 00/ 2130 Stockton Date Collected: 12/7/95 <br /> Sample Matrix Water ceived: 12/12/95 <br /> Datc_atracted: NA <br /> Date Analyzed: 12/18,19/95 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> TPH as Gasoline <br /> EPA Methods 5030/California DHS LUFi'Method <br /> Units ug/L(ppb) <br /> Sample Name MW-2 (72) <br /> Lab Code S9501597-002 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Level S4inple Spike Result Acceptance Percent <br /> Analyte MS DMS Result MS DMS MS DMS Lrrruts Difference <br /> Gasoline 1250 1250 540 1,760 1,710 98 94 67-121 3 <br /> DMSIS1060194 <br /> Page 7 <br />