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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Chent- EMCON Associates Date Received 01/22193 <br /> Project. EMCON Project No OG71.029 01 Service Request No SJ93-0096 <br /> ARCO Facility No 2130 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method: <br /> Nanograms <br /> Date Analyzed 02/01/93 <br /> CAS <br /> Percent <br /> iRecovery <br /> True Percent Acceptance <br /> Analyte. Valid Result Recovery Criteria <br /> Benzene 250 238 95 85-115 <br /> Toluene 250 247 99 85-115 <br /> Ethylbenzene 250 238 95 85-115 <br /> Total Xylenes 750 719 96 85-115 <br /> TPH as Gasoline 2,500 2,279 91 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by: Date: 1?. r p Z <br />