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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/QC Report <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFr Method <br /> Nanograms <br /> Date Analyzed 08/04/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Resull Recovery Cry en <br /> Benzene 250 273 109 85-115 <br /> Toluene 250 274 110 85-115 <br /> Ethylbenzene 250 262 105 85-115 <br /> Total Xylenes 750 754 100 85-115 <br /> TPH as Gasoline 2,500. 2,466 99 90-110 <br /> Date Analyzed 08/05/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Critene <br /> Benzene 250 270 108 85-115 <br /> Toluene 250 274 110 85-115 <br /> Ethylbenzene 250. 267 107. 85-115 <br /> Total Xylenes 750 807 108 85-115 <br /> TPH as Gasoline 2,500. 2,610 104 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by Date <br /> 8 <br /> 1921 Ringwood Avenue • Son Jose Coliforrno 95131 0 Telephone 4081437-2400 • Fox 4081437 9356 <br />