Proposed Effluent Limitations Guidelines for CCR Landfill Leachate and Legacy Wastewater

Lindy Johnson, Stantec
William Kennedy, Stantec

Description

In March 2023, the Environmental Protection Agency (EPA) proposed new Effluent Limitations Guidelines (ELGs) for coal combustion residuals (CCR) landfill leachate and legacy wastewaters from coal-fired power plants. A review of the draft leachate ELGs and developments that have occurred since their proposal will be presented. Definitions, numerical limitations, and implementation schedules, as well as updates on future monitoring requirements on area groundwater will be discussed. The interface with CCR landfill rules will also be examined. Investigations into new ELGs for legacy wastewater will also be presented. Legacy wastewater is wastewater generated prior to the ELG applicability date that is established in the National Pollutant Discharge Elimination System (NPDES) permits for facilities. An example of legacy wastewater would be bottom ash transport water (BATW) that was present in an ash pond or basin prior to the BATW discharge restrictions from ELGs becoming applicable. In addition to the requirements for leachate and legacy wastewaters, publicly accessible websites for ELG compliance must be developed.

 
May 14th, 11:30 AM May 14th, 12:00 PM

Proposed Effluent Limitations Guidelines for CCR Landfill Leachate and Legacy Wastewater

Grand Rapids, Michigan

In March 2023, the Environmental Protection Agency (EPA) proposed new Effluent Limitations Guidelines (ELGs) for coal combustion residuals (CCR) landfill leachate and legacy wastewaters from coal-fired power plants. A review of the draft leachate ELGs and developments that have occurred since their proposal will be presented. Definitions, numerical limitations, and implementation schedules, as well as updates on future monitoring requirements on area groundwater will be discussed. The interface with CCR landfill rules will also be examined. Investigations into new ELGs for legacy wastewater will also be presented. Legacy wastewater is wastewater generated prior to the ELG applicability date that is established in the National Pollutant Discharge Elimination System (NPDES) permits for facilities. An example of legacy wastewater would be bottom ash transport water (BATW) that was present in an ash pond or basin prior to the BATW discharge restrictions from ELGs becoming applicable. In addition to the requirements for leachate and legacy wastewaters, publicly accessible websites for ELG compliance must be developed.