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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> • Client: ARCO Products Company Service Request: S9602045 <br /> Project: 2186 STOCKTON/21775-237.002rrO#19350.00 Date Collected: 11/27/96 <br /> Sample Matrix: Water Date Received: 12/3/96 <br /> Date Extracted: NA <br /> Date Analyzed: 12/6196 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> TPH as Gasoline <br /> EPA Methods 5030/California DHS LUFT Method <br /> Units: ug/L (ppb) <br /> Sample Name: Batch QC <br /> Lab Code: 59602044-007MS, DMS <br /> Percent Recovery <br /> CAS Relative <br /> Spike Level Sample Spike Result Acceptance Percent <br /> Analvte MS DMS Result MS DMS MS DMS Limits Difference <br /> Gasoline 250 250 ND 240 230 96 92 67-121 4 <br /> DMS151060194 <br /> Page 7 <br />