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provides a summary those general parameters and metals pollutants frequently reported above the method detection levels (MDLs) in the Waste Management Elk River Landfill leachate. Table 4 - Elk River Landfill Leachate Characteristics Parameter Units 2011 2012 2013 2014 General Parameters Alkalinity, Total mg/L 5,148 5,875 7,663 8,238 Chemical Oxygen Demand (COD) mg/L 2,498 2,208 6,068 9,300 Chloride mg/L 1,600 2,113 1,968 1,918 Nitrogen, Ammonia (NH4-N) mg/L -- -- -- 1,350 Nitrogen, Total Kjeldahl (TKN) mg/L -- -- -- 1,120 pH SU 7.6 7.7 7.3 7.3 Phosphorus (P) mg/L -- 7.9 -- 10.3 Total Suspended Solids (TSS) mg/L 32 141 611 499 Sulfate (SO4) mg/L 118 22 113 34 Metals mg/L 0.015 0.019 0.041 0.017 Arsenic mg/L 0.088 0.089 0.109 0.105 Boron mg/L 14.9 15.3 14.8 16.3 Cadmium mg/L 0.001 0.001 0.003 0.001 Calcium mg/L 208 112 451 559 Chromium mg/L 0.126 0.167 0.202 0.228 Copper mg/L 0.062 0.007 0.069 0.016 Lead mg/L 0.016 0.005 0.024 0.010 Magnesium mg/L 139 109 149 164 Mercury mg/L <0.004 <0.004 <0.004 <0.004 Molybdenum mg/L 0.015 0.019 0.041 0.017 Nickel mg/L 0.227 0.375 0.571 0.435 Potassium mg/L 377 483 483 524 Selenium mg/L <0.010 <0.010 0.016 0.010 Sodium mg/L 1,493 1,880 1,838 2,028 Zinc mg/L 0.094 0.109 2.504 1.566 Parameters of particular interest include COD, TKN and ammonia which contribute to the aeration demand at the wastewater treatment facility. Although TKN is equal to ammonia nitrogen plus organic nitrogen, the fact that ammonia was reported at a concentration greater than the TKN indicates that the leachate nitrogen is primarily in the form of ammonia nitrogen. Projected COD and TKN load based on the 2014 concentrations and an average daily leachate City of Elk River, Minnesota -121.109643 Page 12 Elk River/Waste Management Leachate Study Prepared by Bolton & Menk, Inc.