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�wW <br /> COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 09/02/93 <br /> 1 Project- EMCON Project No OG71-038 01 Service Request No SJ 93-1101 <br /> ARCO Facility No 2168 <br /> 1 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LOFT Method <br /> ug/L (ppb) <br /> I <br /> Date Analyzed 09/14/93 <br /> I CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Angie Value Result Recovery Criteria <br /> Benzene 25 27 2 109 85-115 <br /> Toluene 25 270 108 85-115 <br /> Ethylbenzene 25 27 1 108 <br /> 85-115 <br /> Total Xylenes 75 81 8 109 85-115 <br /> TPH as Gasoline 250 248 99 90-110 <br /> Approved bylti /U Date <br /> O'TR nn. <br /> 12 <br /> .--,4 A <br />