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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request: 59601538 <br /> Project: 2186 Stockton i#21775-23-.002/TO#19350.00 Date Collected: 9/19/96 <br /> Sample Matrix: Water Date Received: 9/20/96 <br /> Date Extracted: NA <br /> Date Analyzed: 10/1/96 <br /> Mau-m 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: MW-2 (74) <br /> Lab Code: S9601538-002 <br /> Percent Recovery <br /> CAS Relative <br /> Spike Level Sample Spike Result Acceptance Percent <br /> Anaiyte MS DMS Result MS DMS MS DMS Limits Difference <br /> Gasoline 250 25,:1 ND 220 230 88 92 67-121 4 <br /> DMS]S/060194 <br /> Page 7 <br />