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COLUMBIA ANALYTICAL SERVICES INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 10/28/93 i <br /> Project EMCON Project No OG71-01 8 01 Service Request No SJ93-1329 <br /> ARCO Facility No 2093 Sample Matrix Water <br /> Surrogate Recovery Summary <br /> BTEX and 7PH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> Sample Name Date Analyzed Percent_Recovery <br /> a a,a-Trrfluorotoluene <br /> ATR-1 (26) 11/06/93 88 <br /> ATR-2 (29) 11/06/93 86 <br /> ATR-4 {27} 11/08/93 78 <br /> ATR-5 (26) 11/06/93 82 <br /> ATR-6 (26) 11/08/93 72 <br /> ATR-7 (26) 11/06/93 90 <br /> ATR-8 (24) 11/08/93 77 <br /> ATR-9 (24) 11/06/93 7$ <br /> ATR-10 (24) 11/06/93 $7 <br /> ATR-1 1 (23) 11/06/93 86 <br /> ATR-12 (24) 11/06/93 g8 <br /> ATR-1 (26) MS 11/06/93 95 <br /> ATR-1 (26) DMS 11/06/93 93 <br /> Method Blank 11/06/93 78 <br /> Method Blank 11/08/93 75 <br /> CAS Acceptance Criteria 70-130 <br /> Approved byD <br /> -7 ate <br /> 7 <br /> nom. n ,.- „-� a __ - - e__ i_ _ r_ s_ _ _ <br />