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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report T � <br /> Client- EMCON Associates Date Received 01/29/93 <br /> Project EMCON Project No OG71-019 01 Service Request No SJ93-0122 <br /> ARCO Facility No 2133 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Nanograms <br /> Date Analyzed 02/09/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 250 265 106. 85-115 <br /> Toluene 250. 278. 111 85-115 <br /> Ethylbenzene 250 260. 104. 85-115 <br /> Total Xylenes 750. 725 97 85-115 <br /> TPH as Gasoline 2,500 2,356 94. 90-110 <br /> Date Analyzed 02/10/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 250. 252. 101 85-115 <br /> Toluene 250. 261. 104 85-115 <br /> Ethylbenzene 250. 249 100. 85-115 <br /> Total Xylenes 750. 713 95 85-115 <br /> TPH as Gasoline 2,500. 2,612 104 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by Date- 6-r-Wsr-4.1 Z 1953 <br /> 11 <br />