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i COLUMBIA ANALYTICAL SERVICES, INC <br /> Client EMCON Associates Date Received 07/10/92 <br /> Project EMCON Project No G71-29 01 Work Order # SJ92-0835 <br /> j Arco Facility No 2130 Sample Matrix- Water <br /> OA/OC Report <br /> Continuing Calibration Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/DHS LOFT Method <br /> Nanograms <br /> Date Analyzed 07/15/92 <br /> I <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br />' <br /> Anallyte Value Result Recovery Criteria <br /> Benzene 250 273 109 85-115 <br /> Toluene 250 277 111 85-115 <br /> Ethylbenzene 250 266 107 85-115 <br /> Total Xylenes 750 797 106 85-115 <br /> TPH as Gasoline 2,500 2,650 106 90-110 <br />` Date Analyzed 07/16/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 250 276 110 85-115 <br /> Toluene 250 281 112 85-115 <br /> Ethylbenzene 250 270 108 85-115 <br /> Total Xylenes 750 809 108 85-115 <br /> TPH as Gasoline 2,500 2,663 107 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> • <br /> Approved by Date <br /> C) 2� <br /> 5 <br />