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COLUMBIA ANALYTICAL SERVICES INC <br /> :A,QC Penort <br /> Client EMCON ASSOGIates <br /> Date Received 11/3093 <br /> Proleet EMCON Prc,ect No OG71 029 01 Service Request No SJ93 1 453 <br /> ARCO Facially No 2130 <br /> Initial Calibration VerltlCatlon <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/DHS LUFT Method <br /> ,ugfL (ppb) <br /> Date Analyzed 12 06193 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> • Analyte Value Result Recovery Criteria <br /> Benzene 25 27 2 109 35-115 <br /> Toluene 25 27 1 108 35-115 <br /> Ethyibenzene 25 28 5 114 35-115 <br /> Total Xylenes 75 35 1 1 1 5 35- 115 <br /> TPH as Gasoline 250 264 106 20-110 <br /> 1ti l/fit-�1 rr c2 <br /> Approved by �� � Date <br /> 0 <br />