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COLUMBIA ANALYTICAL SERVICES, INC. <br /> w - yy — <br /> 65 <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 <br /> QA/QC Report <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Nanograms <br /> Date Analyzed: 08/31/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Resul Recovery Crrtena <br /> Benzene 250. 266 106 85-115 <br /> Toluene 250 268 107 85-115 <br /> Ethylbenzene 250 259. 104 85-115 <br /> Total Xyienes 750 745 99 85-115 <br /> TPH as Gasoline 2,500 2,524 101 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Q <br /> Approved by___ AAL�t Date <br /> 8 <br />