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COLUMBIA ANALYTICAL SERVICES, INC <br /> OA/OC Report <br /> Client EMCON Associates Date Received. 12/18/92 <br /> Project EMCON Project No OG71-038 01 Service Request No SJ92-1604 <br /> ARCO Facility No 2168 <br /> Inrual Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Nanograms <br /> Date Analyzed 12/24/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte m Result Recovery Criteria <br /> Benzene 250 256 102 85-115 <br /> Toluene 250 262 105 85-115 <br /> Ethylbenzene 250 246 98 85-115 <br /> Total Xylenes 750 718 96 85-115 <br /> TPH as Gasoline 2,500 2,359 94 90-110 <br /> i <br /> i <br /> TPH Total Petroleum Hydrocarbons <br /> I <br /> I Approved by Date: <br />