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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/OC Report <br /> Client EMCON Associates Date Received 01/21/93 <br /> Project EMCON Project No OG71-018 01 Service Request No SJ93-0082 <br /> ARCO Facility No 2093 <br /> Initial Calibration Verification <br /> BTEX and TPH as Gasoline <br /> EPA Methods 5030/8020/DHS LUFT Method <br /> Nanograms <br /> Date Analyzed 01/26/93 <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> AnalMIC Value Rlsyj Recgverlr Critena <br /> Benzene 250. 243 97 85-115 <br /> Toluene 250. 252. 101. 85-115 <br /> Ethylbenzene 250 243. 97. 85-115 <br /> Total Xylenes 750 719 96 85-115 <br /> TPH as Gasoline 2,500 2,290. 92 90-110 <br /> TPH Total Petroleum Hydrocarbons <br /> Approved by: 'l. Date: �� <br /> 7 <br /> 1921 Ringwood Avenue 9 Son Jose California 95131 9 Telephone 4081407 2400 • Fox 408/437-9358 <br />