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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QE Report <br /> Client: ENSR Consulting&Engineering Service Request: S9701286 <br /> Project: Norcal/Stockton Scavenger Co 19647-1401 Date Collected: NA <br /> Sample Matrnz: water Date Received: NA <br /> Date Extracted: NA <br /> Date Analyzed: NA <br /> Surrogate Recovery Summary <br /> BTEX,MTBE and TPH as Gasohne <br />' Prep Method EPA 5030 Units PERCENT <br /> Analysis Method 8020 CA/LUFT Basis NA <br /> Test Percent Recovery <br /> Sample Name Lab Code Notes 4-Bromofluorobenzene a s,a-Tnfluorotoluene <br /> lylw-1 S9701286-001 101 96 <br /> b�M-3 S9701286-002 102 92 <br /> MWA S9701286-003 103 94 <br /> Method Blank S970710-VMI 100 94 <br /> tCAS Acceptance Limits 69-116 69-116 <br /> SUR2=397p <br />' Page 10 <br />