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COLUMBIA ANALYTICAL SERVICES, INC .a <br /> QA/QC Report c3 <br /> 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 /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> ug/L (ppb) <br /> Date Analyzed 06/17/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recover Criteria <br /> 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 /> Approved by WL Date y( C`' <br /> L1 <br /> 10 <br />