Archived
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Location
Lexington, Kentucky
Start Date
6-5-2026 1:30 PM
End Date
6-5-2026 2:00 PM
Description
The effect of closure in place (CiP) of a coal combustion residual (CCR) surface impoundment on the achievement of groundwater remedial performance objectives is evidenced in groundwater monitoring data. The CCR unit is located over a major alluvial aquifer adjacent to a navigable river. The unit is separated from the aquifer by an unsaturated zone and the compliance monitoring wells are located at the unit boundary. Sluicing of CCR to the unit was ceased in early 2020 with dry placement of CCR from other units and CiP/installation of a composite cap substantially completed by the end of 2020. Groundwater corrective measures were required by the detection of lithium and molybdenum at statistically significant levels (SSLs) above the groundwater protection standards (GWPS) as established in accordance with 40 CFR 257.95(h) prior to cessation of waste placement. In the five years since initiation of the elements of CiP, all elevated lithium and molybdenum concentrations have diminished to the point that five of the seven compliance wells have returned to compliance. The remaining wells are projected to achieve compliance with the GWPS for all constituents by approximately 2035. Upon achievement of compliance with GWPSs, the owner will evaluate the regulatory status of the unit and determine the need for further remedial action.
Document Type
Presentation
Archival?
Archival
Included in
Energy Systems Commons, Environmental Indicators and Impact Assessment Commons, Environmental Monitoring Commons, Mining Engineering Commons, Oil, Gas, and Energy Commons, Structural Materials Commons, Sustainability Commons
The Effect of Closure in Place on Groundwater Performance Objectives
Lexington, Kentucky
The effect of closure in place (CiP) of a coal combustion residual (CCR) surface impoundment on the achievement of groundwater remedial performance objectives is evidenced in groundwater monitoring data. The CCR unit is located over a major alluvial aquifer adjacent to a navigable river. The unit is separated from the aquifer by an unsaturated zone and the compliance monitoring wells are located at the unit boundary. Sluicing of CCR to the unit was ceased in early 2020 with dry placement of CCR from other units and CiP/installation of a composite cap substantially completed by the end of 2020. Groundwater corrective measures were required by the detection of lithium and molybdenum at statistically significant levels (SSLs) above the groundwater protection standards (GWPS) as established in accordance with 40 CFR 257.95(h) prior to cessation of waste placement. In the five years since initiation of the elements of CiP, all elevated lithium and molybdenum concentrations have diminished to the point that five of the seven compliance wells have returned to compliance. The remaining wells are projected to achieve compliance with the GWPS for all constituents by approximately 2035. Upon achievement of compliance with GWPSs, the owner will evaluate the regulatory status of the unit and determine the need for further remedial action.
