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COLUMBIA ANALYTICAL SERVICES, INC. <br /> 7r <br /> Client: EMCON Associates Date Received: 08/26/92 <br /> Project- EMCON Project No G71-38.01 Work Order # SJ92-1071 <br /> Arco Facility No 2168 Sample Matrix Water <br />' QA/QC Report <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> 1 <br /> Samole Name Date Analyzed Percent Recovery <br /> a,a,a-Tnfluorotoluene <br /> MW-1 (54) 08/31/92 114 <br /> MW-2 (53) 08/31/92 117 <br /> MW-3 (54) 08/31/92 115 <br /> I MS 08/31/92 122 <br /> DMS 08/31/92 120 <br /> Method Blank 08/31/92 107 <br /> 1 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> 1 <br /> 1 <br /> Approved by Date -� <br /> 1 <br /> 9 <br />