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COLUMBIA ANALYTICAL SERVICES, INC. <br /> OA/OC Report <br />• Cllent: EMCON Associates p . <br /> Date Received• 03/05193 <br /> Project: _EMCON Project No. OG71-033.01 Service Request No.: 5.193-0322 <br /> ARCO facility No. 548 <br /> Initial Calibration Verification <br /> STEX and TPH as Gasoline <br />• EPA Methods 5030/8020/DHS LUFT Method <br /> Nanograms <br /> Date Analyzed: 03/10/93 <br />• <br /> CAS <br /> Percent <br /> Recovery <br /> Tose Percent Acceptance <br />•S Analyte Value Resuk RecQy4ry <br /> Benzene 250. 223. 89. 85-115 <br /> Toluene 250. 247. 99. 85-115 <br /> Ethylbenzene 250. 241. 96. 85-115 <br /> Total Xylenes 750. 729. 97. 85-115 <br />• <br /> TPH as Gasoline 2,500. 2,495. -100. 90-110 <br />• <br /> TPH Total Petroleum Hydrocarbons <br />• <br /> s <br /> Approved by: Date: <br /> 5 <br />