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COLUMBIA ANALYTICAL SERVICES, INC <br /> Client EMCON Assocsates Date Received 01/29/92 <br /> Project E~MCON Project No G71-18 01 Work Order # SJ92-0098 <br /> Arco Facility No 2093 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 /> Sample Name Date Analyzed Percent Recovery <br /> a,a,a-Tnfluorotoluene <br /> ATR-1 1261 01/29/92 104 <br /> ATR-2 (29) 01/29/92 102. <br /> ATR-6 (26) 01/29/92 107 <br /> ATR-9 (24) 01/29192 105 <br /> ATR-10 (241 01/29/92 107• <br />. ATR-11 (23) 01/29/92 106 <br /> ATR-12 (24) 01/29/92 105 <br /> ATR-8 (24) 01/29/92 103 <br /> ATR-5 (26 5) 01/29/92 110. <br /> ATR-4 (29) 01/29/92 110 <br /> ATR-4 (29) (MS) 01/29/92 129• <br /> ATR-4 (29) (MSD) 01/29/92 128• <br /> Method Blank 01/29/92 105• <br /> CAS Acceptance Catena 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by Date <br /> 7 <br /> 192' Ringwood Avenue • Son Jose California 95131 • Telephone 408/437 2400 Fax 408/437 9356 <br />