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COLUMBIA ANALYTICAL SERVICES, INC- <br /> QA/QC Report <br />*Client: EMCON Associates Service Request: 5941424 <br /> Project: TOSCO#11192/0952-090.02 Date Collected: 1119,10194 <br /> Sample Matrix: Soil Date Received: 11/11/94 <br /> Date Extracted: NA <br /> Date Analyzed: 11/15/94 <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/Ca1ifornia DHS LUFr Method <br /> Percent Recovery <br /> Sample Name Lab Code a,a,a-Trifluorotoluene <br /> 11192-THP4S-10 5941424-001 113 <br /> 11 192THP4S-25 S941424-002 107 <br /> 11192-THPIS-10 S941424-003 108 <br /> 11192 THPIS-25 5941424-04 109 <br /> 1192 THP2S-10 5941424-005 103 <br /> 11192-THP2S-25 5941424-006 107 <br /> 11192-THP3 5-10 5941424-007 110 <br /> 11192-THP3 S-25 5941424-008 103 <br /> Method Blank S941115-SB 108 <br /> 1 <br /> CAS Acceptance Limits: 51-137 <br /> • <br /> Approved By: Date: -2 3 <br /> 5UAIAMM4 <br /> Page 13 of 15 <br />