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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: EMCON Associates Date Received: 01/22/93 <br /> Project: EMCON Project No OG71-029 01 Service Request No SJ93-0096 <br /> ARCO Facility No 2130 <br /> Initial Calibration Venficat3on <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020IDHS LUFT Method <br /> !Nanograms <br /> Date Analyzed 01/27/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> AnaMe Value Result Recovery Criteria <br /> Benzene 250 256 102 85-115 <br /> Toluene 250 267 107 85-115 <br /> Ethyibenzene 250 260 104 85-115 <br /> Total Xylenes 750 769 107 85-115 <br /> TPH as Gasoline 2,500 2,490 100 90-110 <br /> Date Analyzed 01/28/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 250 260 104 85-115 <br /> Toluene 250 269 108 85-115 <br /> Ethyibenzene 250 261 104 85-115 <br /> Total Xylenes 750 768 102 85-115 <br /> TPH as Gasoline 2,500 2,453 98 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by- U Date- <br /> d� <br />