Power Plant Ash Pond Closure

Site Overview

Envirocon was awarded a contract to perform the closure of two Ash Ponds at a Power Plant in Illinois. The project encompassed approximately 125 acres of ash ponds and was executed in four sequential stages to support efficient material balancing, dewatering, and construction activities. The scope included ash excavation and regrading, dewatering, installation of a compliant soil cover system, stormwater controls, and final site restoration in accordance with EPA requirements.

Project Highlights

• Final closure of two coal ash ponds totaling approximately 125 acres.
• 75,000 CY of ash excavation to construct dewatering ditches.
• 338,000 CY of ash excavation, placement, and compaction.
• 351,700 CY of clay excavated, placed, and compacted.
• 117,300 CY of vegetative soil excavated and placed.
• 4 miles of permanent access roads installed.
• 138 acres of seeding and fertilizing.

Value Delivered

Envirocon successfully executed a large-scale ash pond closure through disciplined staging, precise material management, and effective dewatering strategies. Strategic reuse and redistribution of ash across project stages minimized off-site handling while achieving final grades and regulatory compliance.
The project delivered a durable, long-term closure solution featuring a robust cover system, permanent stormwater controls, and improved site access, supporting environmental compliance and long-term site stability.