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COLUMBIA ANALYTICAL SERVICES. INC <br /> T ' <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 LUFf Method <br /> I Nanograms <br /> Date Analyzed 08/31/92 <br /> 1 CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> 1 • Benzene 250 266 106 85-115 <br /> Toluene 250 268 107 85-115 <br /> Ethylbenzene 250 259 104 85-115 <br /> Total Xylenes 750 745 99 85-115 <br /> TPH as Gasoline 2,500 2,524 101 90-110 <br /> 1 <br /> 1 <br /> TPH Total Petroleum Hydrocarbons <br /> r <br /> Approved by � _—Date "1 Lf_q <br /> 8 <br />