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COLUMBIA ANALYTICAL SERVICES INC t <br /> QA/QC Report <br /> II Client EMCON Associates Date Received 06/11/93 <br /> Project EMCON Project No OG71-038 01 Service Request No SJ93-0776 <br /> ARCO Facility No 2168 <br /> I <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> 1 u91L {ppb} <br /> Date Analyzed 06/17/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> 1, Benzene 25 23 9 96 85-115 <br /> Toluene 25 248 99 85-115 <br /> Ethylbenzene 25 229 92 85-115 <br /> Total Xylenes 75 69 8 93 85-115 <br /> TPH as Gasoline 250 245 98 90-110 <br /> 1 <br /> r <br /> r <br /> r <br /> Approved by 't Date <br /> 10 <br />