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COLUMBIA ANALYTICAL SERVICES, INC <br /> Client EMCON Associates Date Received 07/31/92 <br />. Project EMCON Project No G71-19 01 Work Order ## SJ92-0945 <br /> Arco Facility No 2133 <br /> QA/OC Report <br /> Initial Calibration Venfication <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/DHS LUFT Method <br /> Nanograms <br /> Date Analyzed 08/06/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Anafvte Value Result Recovery Critena <br /> Benzene 250 265 106 85-115 <br /> Toluene 250 273 109 85-115 <br /> Ethylbenzene 250 264 106 85-115 <br /> Total Xylenes 750 809 108 85-115 <br /> TPH as Gasoline 2,500 2,330 93 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by 1 t"44Date <br /> 9 <br /> 1921 Ringwood Avenue • Son Jose California 95131 • Telephone 4081437-2400 • Fox 4081437-9358 <br />