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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 04/16/93 <br /> Project EMCON Project No 0G71-018 01 Service Request No SJ93-0521 <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 /> I <br /> I <br /> i <br /> i <br /> Sample Name Date Analyzed Percent Recover <br /> a,a,a-Tri f l u o rotol u e n e <br /> ATR-1 (26) 04/23/93 72 <br /> ATR-2 (29) 04/23/93 98 <br /> ATR-4 (28) 04/23/93 89 <br /> ATR-F 1261 04/26/93 104 <br /> ATR-b 12o) 04/23/93 91 <br /> ATR-7 1261 04/23/93 88. <br /> ATR-8 (241 04/26/93 92 <br /> ATR-9 (24) 04/23/93 88 <br /> ATR-10 (24) 04/23/93 89 <br /> ATR-11 (23) 04/23/93 94 <br /> ATR-12 (24) 04/23/93 88 <br /> ATR-1 (26) MS 04/23/93 92 <br /> ATR-1 1261 DMS 04/23/93 94 <br /> Method Blank 04/23/93 87 <br /> Method Blank 04/26/93 87 <br /> CAS Acceptance Catena 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> i <br /> Approved by, Date <br /> 9 <br /> 1921 Ringwood Avenue a Son lose California 95131 • Telephone 4081437-2400 0 Fox 4081437 9356 <br />