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1 COLUMBIA ANALYTICAL SERVICES, INC <br /> 1 <br /> . Client. EMCON Associates Date Received 10/08/92 <br /> Project: EMCON Project No OG71-029 01 Work Order # SJ92-1247 <br /> 1 Arco Facility No 2130 Sample Matnx Water <br /> 1 <br /> I <br /> I QA/QC Report <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/DHS LOFT Method <br /> I <br /> I <br /> Sample Name Dple Anglyzed Percent Recovery <br /> I a,a,a-Trifluorotoluene <br /> I <br /> MW-1 (74) 10/12/92 112 <br /> MW-2 (72) 10/12/92 126. <br /> MW-3 (73) 10/12/92 92 • <br /> MW-4 (74) 10/13/92 108 <br /> MW-5 (76) 10/13/92 122 <br /> MW-3 (73) MS 10/12/92 110 <br /> MW-3 (73) DMS 10/12/92 106 <br /> Method Blank 10/12/92 108 <br /> Method Blank 10/13/92 91 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> • The surrogate used on this sample was 4-Bromofluorobenzene <br />• <br /> Approved byDate 20 2— <br /> 7 <br />