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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client- EMCON Associates Data Received: 01/29/93 <br /> Project: EMCON Project No OG71-029 01 Service Request No : SJ93-0125 <br /> ARCO Facility No 2130 Sample Matnx 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 RecavoEy <br /> a,a,a-Tnflucrotoluene <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 96 <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by: Date. gL17111 <br /> 7 <br /> 5 <br />