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I COLUMBIA ANALYTICAL SERVICES, INC. <br /> . Client* EMCON Associates Date Received 10/08/92 <br /> Project: EMCON Project No OG71-029 01 Work Order #t SJ92-1247 <br /> I Arco Facility No 2130 <br /> I <br /> OA/OC Report <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/011S LUFT Method <br /> Nanograms <br /> f Date Analyzed 10/12/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> AnaI3dQ Value Result Recovery Criteria <br />' Benzene 250 261 104 85-115 <br /> Toluene 250 266 107 85-115 <br /> Ethylbenzene 250 253 101 85-115 <br /> Total Xylenes 750 709 95 85-115 <br />• TPH as Gasoline 2,500 2,431 97 90-110 <br /> Date Analyzed 10/13/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 250 261 104 85-115 <br /> Toluene 250 271 108 85-115 <br /> Ethylbenzene 250 260 104 85-115 <br /> Total Xylenes 750 754 101 85-115 <br /> TPH as Gasoline 2,500 2,497 100 90-110 <br /> TPH Total Petroleum Hydrocarbons <br />• <br /> Approved by Date zL7 Q <br /> 6 <br />