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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request: 59600832 <br /> Project- 2186 Stockton/#21775-237.002/TO#19350.00 Date Collected: 5123/96 <br /> Sample Matrix: Water Date Received: 5/24196 <br /> Date Extracted: NA <br /> Date Analyzed: 5/31-61/96 <br /> Surrogate Recovery Summary <br /> BTEX,MTBE and TPH as Gasoline <br /> EPA Methods 5030/8020/CaIifornia DHS LUFr Method <br /> PID Detector FID Detector <br /> Percent Recovery Percent Recovery <br /> Sample Name Lab Code 4-Bromofluorobenzene a,(x,oc—Trifluorotoluene <br /> MW-1(74) S9600832-001 92 100* <br /> MW-2(74) 59600832-002 102 102 <br /> MW-3(74) 59600832-003 105 102 <br /> VW-3D(60) S9600832-004 104 103* <br /> Batch QC (MS) S96008304)03MS 104 101 <br /> Batch QC (DMS) S9600830-003DMS 106 99 <br /> Method Blank S960531-WB 1 100 100 <br /> CAS Acceptance Limits: 69-116 69-116 <br /> * The surrogate used for this sample was 4-Bromofluorobenzene. <br /> sUR71050194 Page 6 <br />