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I <br /> COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Deport <br /> i <br /> Client EMCON Associates Date Received 03/03/93 <br /> Project EMCON Project No OG71-051 01 Service Request No SJ93-0304 <br /> ARCO Facility No 6020 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> i EPA Methods 5030/8020/DHS LUFT Method <br /> Nanograms <br /> Date Analyzed 03/09/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 250 234 93 85-115 <br /> Toluene 250 257 103 85-115 <br /> Ethylbenzene 250 255 102 85-115 <br /> Total Xylenes 750 768 102 85-115 <br /> TPH as Gasoline 2,500 2,465 99 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by Date _ 3 ^, <br /> 5 <br />