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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request: 5951324 <br />' Project: 1775-237.001 1 TO## 17075.00 12186 Stockton Date Collected: 10/23/95 <br /> Sample Matrix: Water Date Received: 10/25/95 <br /> Date Extracted: NA <br />' Date Analyzed: 11/3/95 <br /> Surrogate Recovery Summary <br />' BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LOFT Method <br />' PID Detector FID Detector <br /> Percent Recovery Percent Recovery <br /> Sample Name Lab Code 4-Bromotluorobenzcne a,oL,a—Trifluorotoluene <br /> MW-I 5951324-001 103 <br /> 103 <br /> MW-I(MS) S951324-00 I MS 108 109 <br /> MW-I(DMS) 5951324-OO I DMS 107 106 <br /> Method Blank 5951103-WB 98 105 <br />' CAS Acceptance Limits: 69-116 69-116 <br /> SUR2/060194 <br />' Page 5 <br />