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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received: 04/07/93 <br /> Project- EMCON Project No OG71-029 01 Service Request No SJ93-0472 <br /> ARCO Facility No 2130 Sample Matrix: Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> Sample Name Date Analyzed Percent Recovery <br /> a,a,o-Trifluorotoluene <br /> MW-1 (74) 04/14/93 94 <br /> MW-2 (72) 04/14/93 100 <br /> MW-3 (73) 04/14/93 108 <br /> MW-4 (74) 04/14193 96 <br />. MW-5 (76) 04/15/93 93 <br /> MW-6 (73) 04/15/93 101 <br /> MW-7 (73) 04/14/93 94 <br /> MW-1 (74) MS 04/14/93 94 <br /> MW-1 (74) DMS 04/14/93 93 <br /> Method Blank 04/14/93 86 <br /> Method Blank 04/15/93 87 <br /> CAS Acceptance Criteria 70-130 <br /> TRH Total Petroleum Hydrocarbons <br /> Approved by Date <br /> 7 <br />