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COLUMBIA ANALYTICAL SERVICES, INC. <br /> OA OC Report <br /> Client: EMCON Associates Date Received: 05/121,93 <br /> Project: Teichert Construction,OF90-002.0:3 Service Request No.. SJ93-0655 <br /> Sample Matrix: Water <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/California DHS LIFT Method <br /> Sample Name Date Analyzed Percent Recovery <br /> v,a,a-Trifluorotoluene <br /> MW-10 05/20/93 101 . <br /> MW-1 1 05/20/93 89• <br /> MW-1 2 05120.'93 80. <br /> MW-13 05/20/93 1 11 <br /> Method Blank 05/20/93 85• <br /> CAS Acceptance Criteria 70-130 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by: tL Date: <br /> 5 <br /> 1921 Ringwood Avenue • San Jose, California 95131 o Telephone 408/437-2400 fox 408/437-9356 <br />