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COLUMBIA ANALYTICAL SERVICES, INC. <br /> Client EMCON Associates Date Received 07/14/92 <br /> Project: EMCON Project No G71-18 01 Work Order# SJ92-0856 <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 /> Samqle Name Dat2 AnalyzqA Percent Recovery <br /> a,a,a-Tnfluorotoluene <br /> ATR-1 (27) 07/17/92 106. <br /> ATR-2 1291 07/17/92 110 <br /> ATR-4 (29) 07/17/92 107 <br /> ATR-5 (26) 07/17/92 115, <br /> ATR-6 (26) 07/17/92 104 <br /> ATR-8 (24) 07/17/92 104. <br /> ATR-9 (24) 07/17/92 98 <br /> ATR-10 (24) 07/20/92 110. <br /> ATR-11 (23) 07/17/92 107 <br /> ATR-12 (24) 07/17/92 105, <br /> ATA-1 (27) MS 07/17/92 99 <br /> ATRA (27) DMS 07/17/92 104 <br /> Method Blank 07/17/92 110. <br /> Method Blank 07/20/92 114 <br /> CAS Acceptance Catena 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved byDate z <br /> 8 <br /> 1921 Rrnawood Avpnu(- + Son Inca C�ifn�, O54'14 • T.l.-k. OMQIA' - nAnn nncc <br />