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COLUMBIA ANALYTICAL SERVICES. INC. <br /> Client* EMCON Associates Date Received 07/10/92 <br /> Project, EMCQN Project No G71-29 01 Work Order # SJ92-0835 <br /> Arco Facility No 2130 Sample Matnx- Water <br /> QA/QC Report <br /> Continuing Calibration Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/OHS LUFT Method <br /> Nanograms <br /> Date Analyzed 07/15/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyle Value Result Recovery Cn rs <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 Crilene <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 /> TPN as Gasoline 2,500 2,663 107 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by Date ` 2 <br />