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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 10/13/92 <br /> Project EMCON Project No OG71-018 01 Work Order No SJ92-1268 <br /> ARCO Facility No 2093 Sample Matrix Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> Sample Naml. Date AnalyzedAnalyZed Percent R <br /> a,a,a-Triflurotoluene <br /> ATR-1 (26) 10/16/92 106. <br /> ATR-2 (29) 10/16/92 108 <br /> ATR-4 (29) 10/15/92 109 <br /> ATR-5 (26) 10/15/92 109 <br /> ATR-6 (26) 10/16/92 107. <br /> ATA-7 (26) 10/16/92 107 <br /> ATR-8 (24) 10/16/92 112. <br /> ATR-9 (24) 10/16/92 109. <br /> ATR-10 (24) 10/16/92 106• <br /> ATR-11 (23) 10/16/92 104• <br /> ATR-12 (24) 10/16/92 106. <br /> ATR-6 (26) MS 10/16/92 110. <br /> ATR-6 (26) DMS 10/16/92 110• <br /> Method Blank 10/15/92 100• <br /> Method Blank 10/16/92 101. <br /> CAS Acceptance Catena 70-130 <br /> Approved by Date Y-2 <br /> 9 <br /> 1921 Ringwood Avenue Son lose Coliforrno 95131 • Telephone 4081437 2400 + Fox 4081437 9356 <br />