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TABLE 2-4 CONSTITUENTS EXCEEDING CONCENTRATION LIMITS SECOND QUARTER 2007 FORWARD UNIT Well ID Constituent Sample Result Concentration Concentration Limit Basis Limit MW-01A Bicarbonate 750 UTL 390 Calcium 150 CLGB 110 Chloride 160 CLGB 97 Chromium Hexavalent 0.0036 PQL 0.0020 Magnesium 74 CLGB 54 Sodium 100 CLGB 63 Sulfate 120 UTL 84 Total Dissolved.Solids 840 CLGB 800 MW-02A Bicarbonate go UTL 880 MW-03A Bicarbonate 510 UTL 340 Calcium 100 CLGB 91 Chloride 110 CLGB 94 Chromium Hexavalent 0.0041 PQL 0.0020 Magnesium 49 CLGB 44 Sodium 76 CLGB 57 MW-10 Arsenic 0.0023 PQL 0.0020 Bicarbonate 300 UTI, 220 Chromium Hexavalent 0.0025 PQL 0.0020 Dichlorodifluoromethane 0.55 PQL 0.50 MW-13 Barium 0.59 CLGB 0.52 Bicarbonate 1200 UTL 675 Chromium Hexavalent 0.0027 PQL 0.0020 Magnesium 81 CLGB 77 Sodium 87 CLGB 82 • Strontium 1.8 CLGB 1.6 Sulfate 42 UTL 32 MW-14 Bicarbonate 1200 UTL 785 Chromium Hexavalent 0.0022 PQL 0.0020 Magnesium 96 CLGB 95 MW-15 Bicarbonate 440 UTL 355 Chromium Hexavalent 0.0048 PQL 0.0020 MW-16 Barium 0.56 BL 0.33 Bicarbonate 770 BL 515 Magnesium 71 BL 67 MW-17 Calcium 100 UTL 89 Sodium 46 UTL 42 Sulfate 76 UTL 67 MW-18 Chromium Hexavalent 0.0030 PQL 0.0020 Sulfate 72 UTL 69 MW-19 Chromium Hexavalent 0.0038 PQL 0.0020 Sulfate 82 UTL 67 MW-21 Barium 0.45 BL 0.33 Bicarbonate 840 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). HY2Q07Tab1a hShM1