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I <br /> COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client, EMCON Associates Date Received 02/26/93 <br /> Project EMCON Project No OG71-050 01 Service Request No SJ93-0279 <br /> ARCO Facility No 2076 <br /> E <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> uS/L {ppb} <br /> Date Analyzed 03/08/93 <br /> i <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 25 25 5 102 85-115 <br /> Toluene 25 269 108 85-115 <br /> Ethylbenzene 25 26 3 105 85-115 <br /> Total Xylenes 75 84 7 113 85-115 <br /> TPN as Gasoline 250 225 90 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by Date <br />