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COLUMBIA ANALYTICAL SERVICES,INC. <br /> ' QA/QC Report <br /> ' Client: EMCON Service Request: K9504048 <br /> Project: Tosco-Tracy/#2788-100.002 Date Collected: 6/29/95 <br /> Sample Matrix: Soil Date Received: 6/30/95 <br /> ' Date Extracted: 6/30/95 <br /> Date Analyzed: 7/3,4/95 <br /> Surrogate Recovery Summary <br /> BTEX and Total Petroleum Hvdrocarbons as Gasoline <br /> EPA Methods 5030A/8020 and California DHS LUFT Method <br /> Percent Recovery Percent Recovery <br /> Sample Name Lab Code 1,4-DFB(PID -BTEX) 1,4-DFB (FID-GAS) <br /> tHP-1-10.0' K9504048-007 79 78 <br /> HP-2-11' K9504048-011 79 78 <br /> HP-3-11' K9504048-013 77 <br /> Method Blank 76 <br /> K950630-SB2 104 103 <br /> t <br /> t <br /> CAS Acceptance Limits: 52-123 48-129 <br /> J' Approved By: Date: _ <br /> SUR]/111594 <br /> 04046PHC WGI-GB SUR 7/Sl95 Page No.: <br /> I O !1 1 <br />