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I <br /> COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received. 01/29/93 <br /> I Project EMCON Project No OG71-029 01 Service Request No SJ93-0125 <br /> ARCO Facility No 2130 Sample Matrix Water <br /> i <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> Sam ?Sam12?1 Name Date Analyzed Percent Recovery <br /> a,a,a-Trifluorotoluene <br /> MW-6 (73) 02/08/93 100 <br /> MW-7 (73) 02/08/93 107 <br /> MS 02/08/93 123 <br /> DMS 02/08/93 124 <br /> Method Blank 02/08/93 98 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by: Date <br /> 5 <br />