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ICOLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: ENSR Consulting&Engineenmg Service Request: 59701416 <br />' Projeet: Norral/Stockton Scavenger/5027-002 Date Collected: NA <br /> Sample Matrix: Water Date Received: NA <br /> Date Extracted: NA <br /> Date Analyzed: NA <br />' Surrogate Recovery Siunmary <br /> BTEX,MTBE and TPH as Gasohne <br /> I <br />' Prep Method EPA 5030 Units PERCH <br /> Analysts Method 8020 CA/LUFT Basis NA <br /> i <br /> Test Percent Recovery <br /> Sample Name Lab Code Notes 4 Bromofluorobenwne a,a,a-Tnfluorotoluene <br />' MW2 59701416-001 100 106 <br /> Method Blank 5970729-WB1 101 95 <br /> I <br /> i <br /> I <br /> I <br />' CAS Acceptance Linuts 69-116 69-116 <br /> I <br /> IS[1RM0397p <br /> IPage 18 <br />