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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 05/28/93 <br /> Project EMCON Project No OG71-01 7 01 Service Request No SJ93-0719 <br /> ARCO Facility No 434 <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 06101/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Cri ena <br /> Benzene 25 24 9 100 85-115 <br /> Toluene 25 25 5 102 85-115 <br /> Ethylbenzene 25 24 4 981 -, 85-115 <br /> Total Xylenes 75 743 99 85-115 <br /> TPH as Gasoline 250 251 100 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> i <br /> Approved by Date <br /> 7 <br /> 1921 Ringwood Avenue - Son Jose Colifornio 45181 9 Telephone 4081437 2400 • Fox 4081487 9356 <br />