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COLUMBLA ANALYTICAL SERVICES. INC <br /> QA/QC Report <br /> Client: EMCON Associates Date Aece,ved: 04/07/93 <br /> Project: EMCON Project No. OG71-029 01 Service Request No, 5.793-0472 <br /> ARCO Facility No 2130 Sample Matrix: Water <br /> Surrogate Recovery Summary <br /> 8TEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> Sample Name Date Analyzed Percent Recovery <br /> a,a,a-Trifluorotoluene <br /> MW-1 1741 04/14/93 94 <br /> MW-2 1721 04/14/93 100 <br /> MW-3 (73) 04/14/93 108 <br /> MW-41741 04/14/93 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 36 <br /> Method Blank 04/1 5193 87 <br /> CAS Acceptance Criteria 70.130 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by [�t�L r���,.. _ Date <br /> 7 <br />