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I <br /> COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 02/26/93 <br /> Project EMCON Project No OG71-050 01 Service Request No SJ93-0279 <br /> ARCO Facility No 2076 Sample Matrix Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> Sample Name Date Analyzed Percent Recovery <br /> a,a,a-Trifluorotoluene <br /> MW-1 (61) 03/08/93 79 <br /> MW-2 X621 03/08/93 78 <br /> MW-3 (62) 03/08/93 84 <br /> MW-4 (62) 03/08/93 85 <br />. MW-1 (61) MS 03/08/93 94 <br /> MW-1 (61) DMS 03/08/93 91 <br /> Method Blank 03/08/93 75 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> 4 <br /> Approved by J,' Date <br /> r <br />