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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Wient: EMCON Service Request: S9803673 <br /> Project: USA Station No. 55,Lodi,CA/20A41-008.001 Date Collected: NA <br /> Sample Matrix: Water Date Received: NA <br /> Date Extracted: NA <br /> Date Analyzed: NA <br /> Surrogate Recovery Summary <br /> BTEX, MTBE and TPH as Gasoline <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,a,a-Trifluorotoluene <br /> MW-1 S9803673-001 104 86 <br /> MW-3 S9803673-002 107 87 <br /> MW4 S9803673-003 108 93 <br /> MW-5 S9803673-004 105 83 <br /> MW-6 S9803673-005 105 92 <br /> MW-7 59803673-006 106 86 <br /> MW-8 59803673-007 86 116 <br /> Method Blank 5981230-WB1 100 72 <br /> Method Blank S981231-WB1 104 91 <br /> *Method Blank S990102-WB1 105 87 <br /> CAS Acceptance Limits: 69-116 69-116 <br /> SUU020397P <br /> Page 17 <br />