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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client EMCON Associates Date Received 04/16/93 <br /> Project EMCON Project No OG71-018 01 Service Request No SJ93-0521 <br /> ARCO Facility No 2093 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> u9/L (ppb) <br /> Date Analyzed 04/23/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 25. 244 97 85-115 <br /> Toluene 25. 264 106 85-115 <br /> Ethylbenzene 25 25 5 102 85-115 <br /> Total Xylenes 75 759 - 101 85-115 <br /> TPH as Gasoline 250 244 98 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> i <br /> Approved by Date <br /> 8 <br /> 1921 Ringwood Avenue • Son lose Colifornio 95131 • Telephone 408/437-2400 • Fox 4081437-9356 <br />