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COLUMBIA ANALYTICAL SERVICES,INC <br /> QA/QC Report <br /> Client EMCON <br /> Service Request 59900683 <br /> Protect Apadhe Plasms/22640-100 001 Date Collected NA <br /> Sample Matrix Soil Date Received NA <br /> Date Extracted NA <br /> Date,AnalyLed NA <br /> Surrogate Recovery Surnmary <br /> Fuel Oxygenates <br /> Prep Method NONE Units PERCENT <br /> Analysis Method 8260 Basis NA <br /> Test P e r c e n t R e c o v e r y <br /> Sample Name Lab Code Notes Dibromotluoromethane Toluene-138 4-Bromofluorobenzene <br /> STP-1234 59900683-005 98 103 108 <br /> B-1(66) 59900683-006 101 106 Ill <br /> B-1(74) 59900683-007 101 107 110 <br /> B-1(82) S9900683-008 102 110 Ill <br /> B-1(105) 59900683-009 98 104 109 <br /> B-2(82) 59900683-010 104 107 111 <br /> B-2(96) 59900681 011 103 107 111 <br /> B-2(102) S9900683 012 104 108 111 <br /> B-2(108) 59900683-013 99 106 111 <br /> Method Blank 5990304-SBI 103 108 109 <br /> EPA Acceptance Ltrruts 80-120 81-117 74-121 <br /> �r sup—t/020597p <br /> Page 50 <br />