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CLGB - Concentration Limit Greater Than Background (Impact Constituents only). See Table 5-12 of Revised Post -Closure Maintenance Pian (11/2/94). <br />UTL - Upper Tolerance Limit. See Table 5-15 of Revised Post -Closure Maintenance Plan (11/2/94). <br />BL - Background Limit. Determined from historical data at MW -20 and MW -23R. (Mean + [2.375 x Standard Deviation]) <br />PQL - Practical Quantitation Limit from current laboratory report. <br />647 - November 2006 concentration exceeds the CLGB, UTL, BL, or PQL. <br />Page 1 of 4 <br />