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1 <br /> COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client: EMCON Associates Date Received 01/29/93 <br /> Project- EMCON Project No OG71-029 01 Service Request No SJ93-0125 <br /> ARCO Facility No 2130 <br /> M <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoitne <br /> EPA Methods 5030180201DHS LOFT Method <br /> Nanograms <br /> Date Analyzed 02/08/93 <br /> CAS <br /> Percent <br /> Recovery <br />• True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 250 235 94 85-115 <br /> Toluene 250 249 100 85-115 <br /> Ethylbenzene 250 238 95 85-115 <br /> Total Xylenes 750 696 92 85-115 <br /> TPH as Gasoline 2,500 2,447 98 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by. Date _ '�kb rvo� / 3 _ <br /> 4 <br />