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' COLUMBIA ANALYTICAL SERVICES, INC. <br /> Client: EMCON Associates Date Received: 08/17/92 <br /> Project: A. Teichert & Sons/F90-02.01 Work Order #: SJ92-1038 <br /> Sample Matrix: Soil <br /> QA/QC Report <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> 1 <br /> Sample Name Date Analyzed Percent Recover <br /> a,a,a-Trifluorotoluene <br /> MW-12 41-41.5 08/25/92 108. <br /> MW-12 80.4-80.9 08/26/92 109. <br /> MW-13 41-41.5 08/25/92 125, <br /> MW-13 80.5-81 08/25/92 108. <br /> B92-1 11-11,5 08/26/92 109. <br /> B92-1 51-51.5 08/26/92 106. <br />' Method Blank 08/25/92 107. <br /> Method Blank 08/26/92 103, j <br /> i <br /> CAS Acceptance Criteria 63-137 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by Lt ,fttk Date �'L f <br /> 8 <br /> 1921 Ringwood Avenue 9 San Jose, California 95131 • Telephone 408/407-2400 Fox 4081437-9056 <br />