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COLUMBIA ANALYTICAL SERVICES, INC. <br /> Client: EMCON Associates Date Received: 03/20/92 <br /> Project: EMCON Project No. G71-33.01 Work Order #: SJ92-0289 <br /> w Arco Facility No. 548 Sample Matrix: Water <br /> I <br /> w - <br /> QA QC Report <br /> Surrogate Recovery Summary <br /> 6TEX and TPH as Gasoline <br /> EPA Methods 5030,'8020/DHS LUFT Method <br /> Samole Name Date Analyzed Percent Recovery <br /> r a,a,a-T rifluorotoluene <br /> MW-1 (56) 03/25/92 97 <br /> MW-2 (61) 03f25192 90. <br /> MW-3 (62) 031,`24192 86. <br />. l MW-4 (63) 03/24/92 87. <br /> Method Blank 03/24/92 85. <br /> Method Blank 03/25/92 88. <br /> 0 <br /> CAS Acceptance Criteria 70-130 <br /> w - <br /> TPH Total Petroleum Hydrocarbons <br />• <br /> - n <br /> i <br /> Approved by Z? Date <br /> 5 <br />