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COLUMBIA ANALYTICAL SERVICES, INC 0. <br /> QA/QC Report <br /> . Client EMCON Associates Date Received 10/28/93 <br />► Project: EMCON Project No OG71-050 01 Service Request No SJ93-1325 <br /> ARCO Facility No 2076 Sample Matrix Water <br /> i <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 50301$020/Californ3a DHS LUFT Method <br /> Sam le Name Date Analyzed Percent Recover <br /> i a,a,a-Tnfluorotoluene <br /> MW-1 (61) 11/05/93 74 <br /> MW-2 (62) 11/05/93 73 <br /> MW-3 (62) 11/05/93 72 <br /> MW-4 (62) 11/05/93 74 <br /> iMS 11/05/93 75 <br /> DMS 11105/93 72 <br /> Method Blank 11/05/93 79 <br /> CAS Acceptance Criteria 70-130 <br /> • <br /> Approved by l W W L 1�-�Vr� __ Date <br /> -- 5 - - - - <br />