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' COLUMBIA ANALYTICAL SERVICES, INC. <br /> Client: EMCON Associates Date Received: 08/26/92 <br /> Project: A. Teichert & Sons, Inc./F90-02.01 Work Order #: SJ92-1072 <br /> Sample Matrix: Water <br /> QA/QC Deport <br />' Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Sample Name Date Analyzed Percent Recovery <br /> a,a,a-Trifluorotoluene <br /> MW-10 09/04/92 116. <br />' MW-11 09/02/92 104. <br /> MW-1 2 09/02/92 105. <br /> MW-13 09/02/92 104. <br /> Method Blank 09/02/92 91, <br /> Method Blank 09/04/92 102. <br /> CAS Acceptance Criteria 70-130 <br />' TPH Total Petroleum Hydrocarbons <br />' Approved by Date <br /> 7 <br /> 1921 Ringwood Avenue • Son Jose, California 95131 • Telephone 4081437-2400 • Fax 4081437.9056 <br />