Archived
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Location
Lexington, Kentucky
Start Date
7-5-2026 9:00 AM
End Date
7-5-2026 9:30 AM
Description
The Trimble County Closure Project is a 5-year project to close the 40-acre (161,900 square meters) Gypsum Storage Pond (GSP) through closure-by-removal and the 100-acre (404,700 square meters) Bottom Ash Pond (BAP) through closure-in-place in accordance with coal combustion residual (CCR) Rule. The excavated gypsum from the GSP was “Beneficially Reused” to fill the BAP to the prescribed grade for drainage through a monitored outfall to the adjacent creek. The daily plant produced CCRs of fly ash, bottom ash, and gypsum were also used for four years to supplement the filling of the BAP as well as several onsite soil/rock stockpiles from Landfill Construction on site. The GSP and BAP were dewatered and treated through the Trimble Generating Station’s water treatment system along with everyday process water from the plant. The BAP cap consists of a synthetic liner/cushion fabric system and a 24-inch (61 centimeter) soil cover system that was installed on the cap along with a 5-acre (20,200 square meter) detention basin in the low end of the pond that was covered with 6-inch (15 centimeters) thick fabric formed concrete. The GSP is currently being backfilled to resemble original topography and drain through a monitored outfall into the adjacent creek that leads to the Ohio River. Completion will occur in the spring of 2026.
Document Type
Presentation
Archival?
Archival
Included in
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Trimble County Pond Closures
Lexington, Kentucky
The Trimble County Closure Project is a 5-year project to close the 40-acre (161,900 square meters) Gypsum Storage Pond (GSP) through closure-by-removal and the 100-acre (404,700 square meters) Bottom Ash Pond (BAP) through closure-in-place in accordance with coal combustion residual (CCR) Rule. The excavated gypsum from the GSP was “Beneficially Reused” to fill the BAP to the prescribed grade for drainage through a monitored outfall to the adjacent creek. The daily plant produced CCRs of fly ash, bottom ash, and gypsum were also used for four years to supplement the filling of the BAP as well as several onsite soil/rock stockpiles from Landfill Construction on site. The GSP and BAP were dewatered and treated through the Trimble Generating Station’s water treatment system along with everyday process water from the plant. The BAP cap consists of a synthetic liner/cushion fabric system and a 24-inch (61 centimeter) soil cover system that was installed on the cap along with a 5-acre (20,200 square meter) detention basin in the low end of the pond that was covered with 6-inch (15 centimeters) thick fabric formed concrete. The GSP is currently being backfilled to resemble original topography and drain through a monitored outfall into the adjacent creek that leads to the Ohio River. Completion will occur in the spring of 2026.
