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R <br /> COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> . Client: ARCO Products Companv Service Request: S9501567 <br /> Project: 1775-206 001 /TOS 17075 00/548 Stockton Date Collected: 1214195 <br /> Saarple Matrix: Water Date Received 12/7/95 <br /> Date Extracted- NA <br /> Ddte Analyzed. 12/14,15195 <br /> \1atn,, Spike/Duplicate Matrix Spike Summary <br /> TPH as Gasoline <br /> EP4 Methods 5030/California DHS L=Method <br /> Units ug/L (ppb) <br /> Sample Name Batch QC <br /> Lab Code 595015404101 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Level Sample Spike Result Acceptance Percent <br /> Analvte MS DMS Result MS DMS MS DMS Litruts Difference <br /> Gasoline 5 000 5 000 6 800 11,000 11,000 84 84 67-121 <1 <br /> • <br />• <br /> DMSIMWi94 <br /> Page 7 <br />