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COLUMBIA ANALYTICAL SERVICES, INC <br /> OA/OC Report <br />• Client EMCON Associates Date Received 04/30/93 <br /> Project EMCON Project No OG71-019 01 Service Request No . SJ93-0591 <br /> ARCO Facility No 2133 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Ng/L (ppb) <br /> Date Analyzed 05/12/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Criteria <br /> Benzene 25 21 5 86 85-115 <br /> Toluene 25 224 90. 85-115 <br /> Ethylbenzene 25 21 4 86 85-115 <br /> Total XVlenes 75 650 87. 85-115 <br /> TPH as Gasoline 250 241 96 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by Date. <br /> 9 <br /> 1921 Rinowood Avenue • Son lose Colifornio 95131 • Telephone 4081437-2400 • Fox 4081437.9354 <br />