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Inorganic Concentration Limits vs. First Quarter 2006 Sampling Event Results <br /> Forward Landfill <br /> MW-01 MW-02A MW-03 MW-10 <br /> Parameter Jan-06 CLGB UTL BL PQL Jan-06 CLGB UTL BLI PQL Jan-06 CLGB UTL BL PQL Jan-06 CLGB UTL BL PQL <br /> Arsenic 0.0012 0.01 0.0018 0.0020 0.0018 0.0020 0.0029 0.0020 <br /> Barium 0.16 0.31 0.48 0.85 0.17 0.24 0.22 0.22 <br /> Bicarbonate 610 390 580 880 460 340 310 220 <br /> e <br /> af iu 'rias 5t1 1 � k <br /> s, a K, a*-. .' - ... .fir <br /> da <br /> Chromium,Hexavalent <0.0020 0.0020 0.0036 0.0020 0.0099 0.0020 0.0037 0.0020 <br /> Magnesium 77 54 50 98 43 44 28 42 <br /> Nitrate 8.6 81 11 81 8.2 81 4.0 32 <br /> pgt�331(1 sFf w s 4 6JIM% <br /> ':,. <br /> "� <br /> Sulfate 76 84 34 45 47 62 40 48 <br /> Total Dissolved Solids 1100 800 660 1300 650 600 440 575 <br /> All concentrations are provided in mg/L. <br /> CLGB-Concentration Limit Greater Than Background(Impact Constituents only). See Table 5-12 of Revised Post-Closure Maintenance Plan(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-January 2006 concentration exceeds the CLGB,UTL,BL,or PQL. <br /> NS-Well was not sampled. Pump at MW-17 was not functional during the first quarter 2006. <br /> Page 1 of 4 HERST & ASSOCIATES, INC. <br />