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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received. 02/24/93 <br /> Project EMCON Project No OG71-017 01 Service Request No SJ93-0261 <br /> ARCO Facility No 434 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LOFT Method <br /> Nanograms <br /> Date Analyzed 03/05/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 250 238 95 85-115 <br /> Toluene 250 270 108 85.115 <br /> Ethylbenzene 250 259 103 85-115 <br /> Total Xylenes 750. 764 102 85-115 <br /> TPH as Gasoline 2,500. 2,538 102. 90-110 <br /> Date Analyzed 03/06/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery !PrIltna <br /> Benzene 250. 225. 90 85-115 <br /> Toluene 250 246 98 85-115 <br /> Ethylbenzene 250 246. 99 85-115 <br /> Total Xylenes 750. 735 98. 85-115 <br /> TPH as Gasoline 2,500. 2,440 98 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Is <br /> Approved by. Date AaZi ' ,� 3 <br /> 7 <br /> 1921 Ringwood Avenue - Son Jose California 95131 • Telephone 408/437 2400 • Fox 408/437 9356 <br />