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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: EMCON Service Request: S9900924 <br /> Project: Teichert-Stockton/20F90-002.007 Date Collected: NA <br /> Sample Matrix: Water Date Received: NA <br /> Date Extracted: NA <br /> Date Analyzed: NA <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> Prep Method: EPA 5030 Units: PERCENT <br /> Analysis Method: 8020 CAILUFr Basis: NA <br /> Test Percent Recovery <br /> Sample Name Lab Code Notes 4-Bromofluorobenzene a,a,a-Tritluorotoluene <br /> MW-9 S9900924-001 89 97 <br /> MW-10 S9900924-002 95 95 <br /> MW-11 59900924-003 90 92 <br /> MW-12 S9900924.004 90 98 <br /> MW-13 S9900924-005 92 103 <br /> MW-14 S9900924-006 80 114 <br /> MW-3 59900924-007 88 98 <br /> WMW-4 S9900924-008 95 95 <br /> -5 S9900924-009 95 94 <br /> Method Blank S990324-WB2 92 96 <br /> Method Blank 5990327-WB1 88 92 <br /> Method Blank 5990329-WB2 91 94 <br /> CAS A=ptance Limits: 69-116 69-116 <br /> II <br /> SURV020397p <br />