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If an earthen manure storage (EMS) is constructed without an engineered compacted clay liner or if the liner is badly eroded, cracked or damaged, leachate from the storage may have transported from the storage into the soil below. When it comes time to decommission the EMS, a significant contaminant plume may have developed beneath the storage. Decommissioning strategies do not remove any existing contamination plumes beneath the earthen structure posing a risk of this plume to travel further into the groundwater system. This study investigates the movement of the plume once decommissioning has taken place in two different soils. Four soil columns were loaded with a simulated EMS leachate. Once equilibrium was reached, fresh groundwater was allowed to percolate through the column, simulating decommissioning. The column effluent was analyzed for major cations and anions found in EMS leachate to determine transport rates of adsorbed cations. The results from the column study were used to simulate decommissioning and long-term leaching of ions from an EMS site.