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i0 COLUMBIA ANALYTICAL SERVICES,INC. <br /> iQA/QC Report <br /> Client: EMCON Service Request: K9504079 <br /> i Project: Tosco-Tracy/#2788-100.02 Date Collected: 6/29/95 <br /> Sample Matrix: Soil Date Received: 7/1/95 <br /> Date Extracted: 7/3/95 <br /> iDate Analyzed: 7/5/95 <br /> Surrogate Recovery Summary <br /> i BTEX and Total Petroleum Hydrocarbons as Gasoline <br /> EPA Methods 5030A/8020 and California DHS LUFr Method <br /> iPercent Recovery Percent Recovery <br /> Sample Name Lab Code 1,4-DFB (PID -BTEX) 1,4-DFB(FID-GAS) <br /> iHP-4-1P K9504079-006 56 57 <br /> Method Blank K950703-SB 108 105 <br /> i <br /> 1 <br /> 1 <br /> i <br /> i <br /> 1 <br /> 1 <br /> 1 <br /> CAS Acceptance Limits: 52-123 48-129 <br /> i <br /> 1 <br /> i Approved By: <br /> Date: <br /> SURL11159d <br /> i6079PHGWGI-G SUR 7/6195 Page N. <br /> 0001 ( <br />