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COLUMBIA ANALYTICAL SERVICES INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 10/28/93 <br /> Project EMCON Project No OG71 018 01 Service Request No SJ93-1329 <br /> ARCO Facility No 2093 <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 11/06/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 25 254 102 85-115 <br /> Toluene 25 25 4 102 85-115 <br /> Ethylbenzene 25 250 100 85-115 <br /> Total Xylenes 75 769 102 85-115 <br /> TPH as Gasoline 250 248 99 90-110 <br /> Approved by _� � _ Date <br />