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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 08/20/93 <br /> Project EMCON Project No OG71-051-01 Service Request No SJ93-1041 <br /> ARCO Facility No 6020 Sample Matrix Water <br /> Surrogate Recovery Summary <br /> 6TEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS LUFT Method <br /> Sample Name Date Analyzed_ Percent Recovery <br /> a,a,a-Trifluorotoluene <br /> MW-1 (39) 08/27/93 87 <br /> MW-2 (37) 08/27/93 85 <br /> MW-3 (36) 08/27/93 85 <br /> MW-4 (341 08/27/93 89 <br /> MW-1 (39) 08/27/93 87 <br /> MW-1 (39) 08/27/93 87 <br /> Method Blank 08/27/93 87 <br /> CAS Acceptance Criteria 70-130 <br /> Approved by Date <br /> i <br /> 5 <br /> 1921 Ringwood Avenue • 5an Jose California 95131 • Telephone 4081407 2400 • Fox 4081437 9356 <br />