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TABLE 2-4 CONSTITUENTS EXCEEDING CONCENTRATION LIMITS FIRST QUARTER 2007 FORWARD UNIT Well ID Constituent Sample Result Concentration Concentration Limit Basis Limit MW-01A Bicarbonate 740 UTL 390 Calcium 160 CLGB 110 Chloride 150 CLGB 97 Chromium Hexavalent 0.0036 PQL 0.0020 Magnesium 80 CLGB 54 Potassium 9.2 CLGB 8.6 Sodium 110 CLGB 63 Sulfate 120 UTL 84 Total Dissolved Solids 990 CLGB 800 MW-02A Arsenic 0.0026 PQL 0.0020 Bicarbonate 910 UTL 880 MW-03A Arsenic 0.0026 PQL 0.0020 Bicarbonate 490 UTL 340 Calcium 110 CLGB 91 Chromium Hexavalent 0.0044 PQL 0.0020 Magnesium 50 CLGB 44 Sodium 78 CLGB 57 Total Dissolved Solids 670 CLGB 600 MW-10 Arsenic 0.0027 PQL 0.0020 Bicarbonate 300 UTL 220 Chromium Hexavalent 0.0031 PQL 0.0020 MW-13 Barium 0.58 CLGB 0.52 Bicarbonate 980 UTL 675 Calcium C 150 Chromium Hexavalent 0.0000 23 PQL 0.0020 Magnesium 80 CLGB 77 Sodium 93 CLGB 82 Strontium 1.7 CLGB 1.6 Sulfate 40 UTL 32 MW-14 Bicarbonate 910 UTL 785 Chromium Hexavalent 0.0035 PQL 0.0020 Tetrachloroethylene 0.99 PQL 0.50 MW-15 Bicarbonate 410 UTL 355 Chromium Hexavalent 0.0025 PQL 0.0020 MW-16 Barium 0.56 BL 0.33 Bicarbonate 790 BL 515 Magnesium 71 BL 67 MW-17 Barium 0.48 UTL 0.37 Calcium 110 UTL 89 Sodium 46 UTL 42 Sulfate 77 UTL 67 MW-18 Arsenic 0.0024 PQL 0.0020 Chromium Hexavalent 0.0037 PQL 0.0020 Sulfate 70 UTL 69 71 mrum flexavalent 0.0021 1 rc nate 330 Bl, 515 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). FLF 1Q07 TablesahU CL