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r COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received: 03/05/93 <br /> Project Teichert Construction-Tracy/OF90-004 01 Service Request No SJ93-0323 <br /> • Sample Matrix Water <br /> • <br /> Surrogate Recovery Summary <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/California DHS LUFT Method <br /> • <br /> Sample Name Date Analyzed Percent Recovery <br /> • a,a,a-Trifluorotoluene <br /> MW-1 03/15/93 96 <br /> Method Blank 03/15/93 98 <br /> CAS Acceptance Criteria 70-130 <br /> • <br /> • <br />~ TPH Total Petroleum Hydrocarbons <br /> • <br /> L u r / <br /> Approved by Date_ <br />• <br /> 4 <br /> 1921 Ringwood Avenue • Son Jose Colifornio 95131 9 Telephone 408/437 2400 • Fox 408/437 9356 <br />