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4 <br /> COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 08/04/93 <br /> I Project EMCON Project No OG71-029 01 Service Request No SJ93-0960 <br /> ARCO Facility No 2130 Sample Matrix Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> 1 <br /> Sample Name Date Analyzed Percent Recovery <br /> a,a,a-Tnfluorotoluene <br /> MW-1 (73) 08/10/93 88 <br /> MW-2 (72) 08/11/93 112 <br /> MW-3 (73) 08/10/93 89 <br /> MW-4 (74) 08/10/93 88 <br /> MW-5 (76) 08/12/93 89 <br /> r <br /> MW-5 (76) 08/12/93 89 <br /> MW-6 {73) 08/10/93 89 <br /> MW-7 {72) 08/10/93 86 <br /> MS 08/10/93 82 <br /> DMS 08/10/93 84 <br /> Method Blank 08/10/93 87 <br /> Method Blank 08/11/93 81 <br /> Method Blank 08/12/93 88 <br /> CAS Acceptance Criteria 70-130 <br /> i <br /> Approved by } "`-'�"` " Y } Date <br /> 6 <br />