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COLUMNA ANALYTICAL SERVICES, INC. - <br /> Client- EMCON Associates Date Received., 10/08/92 - <br /> Project: EMCON Project No OG71-029 01 Work Order # SJ92-1247 <br /> Arco Facility No 2130 <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 10/12/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 250 261 104 85-115 <br /> Toluene 250 266 107 85-115 <br /> Ethylbenzene 250 253 101 85-115 <br /> Total Xylenes 750 709 95 85-115 <br /> TPH as Gasoline 2,500 2,431 97 90-110 <br /> Date Analyzed 10/13/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Arta-IM Value Result Recovery Qrgeng <br /> Benzene 250 261 104 85-115 <br /> Toluene 250 271 108 85-115 <br /> Ethylbenzene 250 260 104 85-115 <br /> Total Xylenes 750 754 101 85-115 <br /> TPH as Gasoline 2,500 2,497 100 90-110 <br /> I <br /> TPH Total Petroleum Hydrocarbons <br /> I <br /> roved b �u <br /> +4PP Y i Date <br /> _ <br /> 7Tr <br /> 6 <br />