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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client: EMCON Associates Date Received: 12/08/92 <br /> Project: EMCON Project No. OG71-033.01 Service Request No.: SJ92-1544 <br /> ARCO Facility No. 548 <br />• <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Nanograms <br /> Date Analyzed: 12/09/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 250. 256. 102. 85-115 <br /> • Toluene 250. 258, 103. 85-115 <br /> Ethylbenzene 250. 241. 97. 85-115 <br /> Total Xylenes 750. 701 . 93. 85-115 <br /> TPH as Gasoline 2,500. 2,422. 97. 90.110 <br />• Date Analyzed: 12/11192 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br />• Analyte Value Result Recovery Criteria <br /> Benzene 250. 254, 102. 85-115 <br /> Toluene 250. 262. 105. 85-115 <br /> Ethylbenzene 250. 241 . 97. 85-115 <br /> Total Xylenes 750. 698. 93. 85-115 <br /> TPH as Gasoline 2,500, 2,693. 108. 90-110 <br /> TPN Total Petroleum Hydrocarbons <br /> Approved by: Date: ��„ ( / � - <br />