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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> I� Client EMCON Associates Date Received 11/01/93 <br /> Project' EMCON Project No OG71-038 01 Service Request No SJ93-1339 <br /> ARCO Facility No 2168 <br /> i <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/DHS LUFT Method <br /> I ug/L (ppb) <br /> Date Analyzed 11/10193 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 25 28 4 114 85-115 <br />►, Toluene 25 28 1 112 85-115 <br /> Ethylbenzene 25 28 1 112 85-115 <br /> Total Xylenes 75 862 1 1 5 85-115 <br /> TPH as Gasoline 250 240 96 90-110 <br /> I <br /> I <br /> I �) <br /> I <br /> I Approved by Date <br />