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Inorganic Concentration Limits vs. Second Quarter 2007 Sampling Event Results <br /> Forward Landfill <br /> MW-01A MW-02A MW-03A MW-10 <br /> Parameter May-07 CLGB UTL I BL I PQL May-07 CLGB UTL I BL PQL May-07 CLGB UTL I BL PQL May-07 CLGB UTL BL PQL <br /> Arsenic 0.0016 0.01 0.0014 0.0020 0.0018 0.0020 0.0023 0.0020 <br /> Barium 0.13 0.31 0.37 0.85 0.2 0.24 0.21 0.22 <br /> Bicarbonate 750 390 890 880 510 340 300 220 <br /> Chromium,Hexavalent 0.0036 0.0020 <2.0 0.0020 0.0041 0.0020 0.0025 0.0020 <br /> Magnesium 74 54 72 98 49 44 29 42 <br /> Nitrate 2.6 78 2.7 78 11 78 4.2 32 <br /> Sulfate 120 84 38 45 57 62 41111 48 <br /> Total Dissolved Solids 840 800 660 1300 460 600 440 575 <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-May 2007 concentration exceeds the CLGB,UTL,BL,or PQL. <br /> Page 1 of 4 ERST & ASSOCIATES, INC. <br />