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• COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 11/19/93 <br /> Project EMCON Project No OG71-017 01 Service Request No SJ93-1434 <br /> ARCO Facility No 434 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> u9/L {ppb} <br /> Date Analyzed 1 1/23/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 25 26 7 107 85-115 <br /> Toluene 25 26 6 106 85-115 <br /> Ethylbenzene 25 26 9 108 85-115 <br /> Total Xylenes 75 79 8 106 85-115 <br /> TPH as Gasoline 250 237 95 90-110 <br /> s <br /> Approved by Date <br /> r 8 <br />