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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: 11/9,10/94 <br /> Sample Matrix: Water Date Received: 11/11/94 <br /> Date Extracted: NA <br /> Date Analyzed:-1.1/.14/94 <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/California DHS LUFT Method <br /> Percent Recovery <br /> Sample Name Lab Code c,oc,o.-Trifiuorotoluene <br /> 11192 THP4W-36 S941424-009 93 <br /> 11192-THP3 W-28 5941424-010 93 <br /> Method Blank 5941114-WB 92 <br /> CAS Acceptance Limits: 69-116 <br /> Approved Bv: Date . l <br /> suauaa�a� • <br /> Page 12 of 15 <br />