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COLUMBIA ANALYTICAL SERVICES, INC <br /> Client. EMCON Associates Date Received 07/14/92 <br /> Protect EMCON Pro)ect No G71-18 01 Work Order • SJ92-0856 <br /> Arco Facility No 2093 <br /> OA/OC Report <br /> Continuing Calibration Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Nanograms <br /> Date Analyzed 07/17/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Vul a Result Recgvery Criteria <br /> Benzene 250 275 110 85-115 <br /> Toluene 250 279 112 85-115 <br /> Ethylbenzene 250 267 107 85-115 <br /> Total Xylenes 750 791. 105 85-115 <br /> TPH as Gasoline 2,500 2,671 107 90-110 <br /> Date Analyzed 07/20/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte M R 1 �C Criteria <br /> Benzene 250 270 108 85-115 <br /> Toluene 250 276 110 85-115 <br /> Ethylbenzene 250 266 106 85-115 <br /> Total Xylenes 750 796. 106. 85-115 <br /> TPH as Gasoline 2,500 2,714 109 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> 4�w � f <br /> Approved by Date �� 1 <br /> 7 <br /> 1921 Rinowood Avaniio • inn In[o f nI Or,4'1, 40A r A'l7 'I Ann , r- .no ,n+ nye 4 <br />