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TABLE 2-4 CONSTITUENTS EXCEEDING CONCENTRATION LIMITS THIRD QUARTER 2007 FORWARD UNIT Well ID Constituent Sample Result Concentration Concentration Limit Basis Limit MW-01A Bicarbonate 740 UTL 390 Calcium 170 CLGB 110 Chloride 160 CLGB 97 Chromium Hexavalent 0.0089 PQL 0.0020 Magnesium 84 CLGB 54 Potassium 9.4 CLGB 8.6 Sodium 110 CLGB 63 Sulfate 150 UTL 84 Total Dissolved Solids 1100 CLGB 800 MW-02A Su ate 55 UTL 45 MW-03A Arsenic 0.0023 PQL 0.0020 Chromium Hexavalent 0.0054 PQL 0.0020 Magnesium 53 CLGB 44 Sodium 79 CLGB 57 Sulfate 66 UTL 62 Total Dissolved Solids 800 CLGB 600 MW-10 Arsenic 0.0031 PQL 0.0020 Bicarbonate 300 UTL 220 Chromium Hexavalent 0.0025 PQL 0.0020 MW-13 Barium 0.68 CLGB 0.52 Bicarbonate 1000 UTL 675 Calcium 180 CLGB 150 Chromium Hexavalent 0.0031 PQL 0.0020 Magnesium 92 CLGB 77 Sodium 110 CLGB 82 Strontium 2 CLGB 1.6 Sulfate 44 UTL 32 MW-14 Bicarbonate 920 UTL 785 Chromium Hexavalent 0.0031 PQL 0.0020 MW-15 Bicarbonate 480 UTL 355 Chromium Hexavalent 0.0049 PQL 0.0020 MW-16 Barium 0.62 BL 0.33 Bicarbonate 930 BL 515 Magnesium 79 BL 67 Strontium 1.7 CLGB 1.6 MW-17 Calcium 110 UTL 89 Sodium 49 UTL 42 Sulfate 78 UTL 67 Toluene 0.70 PQL 0.50 Xylenes,Total 0.92 BL 0.50 MW-18 Arsenic 0.0024 PQL 0.0020 Chromium Hexavalent 0.0033 PQL 0.0020 Sulfate 71 UTI, 69 M719 C mnum Hexavalent 0.0021 P L 0.0020 MW-21 Barium 0.47 BL 0.33 Bicarbonate 850 BL 515 Magnesium 71 BL 67 Notes: CLGB=Concentration Limit Greater Than Background. CLGB=Taken from Table 5-12 of Revised Post-Closure Maintenance Plan,Forward Landfill,by Kleinfelder,dated 11/2/94. UTL=Upper Tolerance Limit. UTL=Taken from Table 5-14 of Revised Post-Closure Maintenance Plan,Forward Landfill,by Kleinfelder,dated 11/2/94. PQL=Practical Quantitation Limits. BL=Background Limit derived from historical data at MW-20 and MW-23R. Mean+(2.375 x Standard Deviation). VLF 3Q07 Tab1es.xh24 CL