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COLUMBIA'ANALYTICAL SERVICES; INC <br /> Clien#: EMCON Associates Date Received: 06/11/92 <br /> Project: EMCON Project No. ;G71-33.01 Work Order at: SJ92-0716'' <br /> Arco-Facility No. 548 Sample Matrix: Water, <br /> QA/QC Report <br /> Surrogate Recovery,Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method " <br /> $amplg Name Date Analyzed. Percent Recovery <br /> a,a,a-Trifiuorotoluene <br /> MW-1 156) 06/15/92 94. <br /> MW-2 (61) 06115/92 84-. <br /> MW-3 162) 06/15/92 82. <br /> MW-4 163) 06/15/92 84. <br />• MS 06/15/92 99. <br /> MSD 06/15/92 99. <br /> Method Blank 06/15/92 94. <br /> CAS Acceptance Criteria 70-130 <br />• TPH Total Petroleum Hydrocarbons <br />• <br />• <br /> Approved by Date <br /> 6 <br />