The North Valmy Generating Station’s landfill is subject to the closure requirements in the CCR Rule because the landfill is classified as an existing CCR landfill. The landfill is considered as an existing CCR landfill because it is an “area of land or excavation that receives CCR” and it received CCR both before and after October 19, 2015, the effective date of the CCR Rule The CCR unit will be closed in a manner that will • “Control, minimize or eliminate to the maximum extent feasible, post-closure infiltration of liquids into the waste and releases of CCR, leachate, or contaminated run-off to the ground or surface waters or to the atmosphere;” (§257.102(d)(1)(i)) – The final cover system will control infiltration of liquid into waste by meeting the permeability requirements listed in the CCR Rule and by providing a final cover surface that is graded to promote positive drainage. Meeting the permeability requirements in the CCR rule will limit the potential for water to infiltrate through the cover and into the underlying waste. Creating a final cover surface that promotes the flow of water will reduce the time available for water to infiltrate through the cover and into the underlying waste. – The final cover system will control the release of CCR by covering exposed CCR to limit contact with wind, water, and other agents of erosion. Armoring, compaction, and/or other erosion control measures may be provided in areas more susceptible to water or wind erosion. Drainage and sediment control structures may be installed to collect and/or detain eroded CCR. – By limiting the amount of water coming into contact with CCR, the measures for controlling infiltration of liquid into waste will also serve to limit the amount of water available to create leachate and the amount of leachate generated. Controlling and reducing the amount of leachate generation will in turn control the release of leachate. By limiting the amount of water coming…

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