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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> • Client EMCON Associates Date Received 11/03/92 <br /> Project EMCON Project No 0G71-019 01 Work Order No SJ92-1367 <br /> ARCO Facility No 2133 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Nanograms <br /> Date Analyzed 11/06/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 250 263 105 85-115 <br /> Toluene 250 273 109 85-115 <br /> Ethylbenzene 250 267 107 85-115 <br /> Total Xylenes 750 780 104 85-115 <br /> TPH as Gasoline 2,500 2,467 99 90-110 <br /> Date Analyzed 11/09/92 <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 250 271 108 85-115 <br /> Ethylbenzene 250 262 105 85-115 <br /> Total Xylenes 750 768 102 85-115 <br /> TPH as Gasoline 2,500 2,494 100 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by ��_ Date /1-/(o qa- <br /> 8 <br />