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COLUMBIA ANALYTICAL SERVICES, INC. <br /> Analytical 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 Sample Matrix Water <br /> BTEX and TPH as Gasoline <br /> EPA Methods 503018020/California DHS LUFT Method <br /> Ng/L (Ppb) <br /> Sample Name ATR-10 1241 ATR-11 (23) ATR-12 (24) <br /> Date Analyzed. 01/26/93 " 01/261930 01/261930 <br /> Analyte MRL <br /> Benzene 05 ND ND ND <br /> Toluene 05 ND ND ND <br /> Ethylbenzene 0.5 ND ND ND <br /> Total Xylenes 05 ND ND ND <br /> TPH as Gasoline 50 ND ND ND <br /> TPH Total Petroleum Hydrocarbons <br /> MRL Method Reporting Limit <br /> ND None Detected at or above the method reporting limit <br /> " This sample was part of the analytical batch started on January 26, 1993 However, it was <br /> analyzed after midnight so the actual date analyzed is January 27, 1993 <br /> Approved by y Date <br /> 4 <br /> 1921 Ringwood Avenue • Son lose Colifornio 95131 • Telephone 4081437 2400 • Fox 4081437 9356 <br />