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COLUMBIA ANALYTICAL SERVICES INC <br /> QA/QC Report <br /> 101t EMCON Associates Date Received 10/13/93 <br /> Project DSS Construction/2481-100 01 Service Request No SJ93-1263 <br /> Sample Matrix Soil <br /> Surrogate Recovery Summa,, <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/California DHS _UFT Method <br /> Sample Name Date Analyzed Percent Recovery <br /> a,a,a-Trifluorotoluene <br /> P-1 10/19/93 90 <br /> P-2 10/19/93 86 <br /> 40 hod Blank 10/19/93 89 <br /> P-3 10/18/93 88 <br /> Method Blank 10/18/93 92 <br /> CAS Acceptance Crit:- a 63-137 <br /> Approved by Date E <br /> 9 <br /> 1921 Ringwood Avenue • Son Jose California 95131 • Telephor^= 78/437 2400 Fox 408/407-9356 <br />