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COLUMBIA ANALYTICAL SERVICES, INC <br /> Client EMCON Associates Date Received 08/20/92 <br /> Project EMCON Project No G71-17 01 Work Order # SJ92-1049 <br /> Arco Facility No 434 <br /> QA/QC Report <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Nanograms <br /> Date Analyzed 08/25192 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Values Result Recovery CrFtena <br /> Benzene 250 255 102 85-115 <br /> Toluene 250 267 107 85-115 <br /> Ethylbenzene 250 251 100 85-115 <br /> Total Xylenes 750 738 98 85-115 <br /> TPH as Gasoline 2,500 2,697 108 90-110 <br /> Date Analyzed 08/27/92 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Anillyle Value Result Recove Criteria <br /> Benzene 250 246 98. 85-115 <br /> Toluene 250. 256 102 85-115 <br /> Ethylbenzene 250 241 96. 85-115 <br /> Total Xylenes 750 700 93. 85-115 <br /> TPH as Gasoline 2,500 2,702 108 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> /� p QQ <br /> Approved by Date 7�c5� 3 �G/- <br /> 8 <br /> 1921 Ringwood Avenue • Son lose Colifomio 95131 • Telephone 4081437 2400 • Fox 408/437-9356 <br />