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COLUMBIA ANALYTICAL SERVICES, INC, <br /> GA/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 /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030180201DHS LUFT Method <br /> Nanograms <br /> Date Analyzed 02/08/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Anal3at value Result Recovery Cnt ria <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- <br /> 4 <br />