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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Service Request S941494 <br /> Protect TOSCO # It 194 /0952-092 02 Date. COIICeted 11/17194 <br /> Sample Matrix Water Date Received 11121/94 <br /> Date Extracted NA <br /> Date Analyzed 11/23/94 <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/California DHS LUFT Method <br /> i <br /> Percent Recovery <br /> Sample Name Lab Code u,a,ec-Trifluorotoluene <br /> 1 1194-HPI-W 5941494-001 105 <br /> 11194-HP2-W S941494-002 111 <br /> 11194-HP3-W S941494-003 104 <br /> 11194-OBS-W-W S941494-004 106 <br /> 11194-OBS-E-W S941494-005 101 • <br /> Method Blank 5941123-WB 101 <br /> CAS Acceptance Limits 69-116 <br /> * The surrogate used for this sample was 4-bromofluorobenzene <br /> Approved By 4±11' / Date r <br /> SUSLIM62994 ' <br /> Page 8 of 9 <br />