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e <br /> COLUMBIA ANALYTICAL SERVICES, INC k <br /> QA/QC Report <br /> Client EMCON Associates Date Received 11/19/92 <br /> Project EMCON Project No OG71-017 01 Work Order No SJ92-1466 <br /> ARCO Facility No 434 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LOFT Method <br /> Nanograms <br /> Date Analyzed 11/25/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 250 243 97 85-115 <br /> Toluene 250 251 100 85-115 <br /> Ethylbenzene 250 241 96 85-115 <br /> Total Xylenes 750 731 101 85-115 <br /> �. TPH as Gasoline 2,500 2,270 91 90-110 <br /> Date Analyzed 11/30/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 250 243 97 85-115 <br /> Toluene 250 252 101 85-115 <br /> Ethylbenzene 250 242 97 85-115 <br /> Total Xylenes 750 733 98 85-115 <br /> TPH as Gasoline 2,500 2,343 94 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by Date <br /> 8 <br />