Ameren Missouri awarded Kolb Grading the general contract to close both the bottom ash and fly ash ponds at the Labadie Power Plant, the largest coal-fired plant in Missouri. The closure covered 278 acres and required excavating, drying, and capping ash that had accumulated over decades of operation.
Kolb excavated more than 1.7 million cubic yards of ash, at up to 15,000 cubic yards per shift, and dried and stabilized unsuitable material with quicklime. Crews installed nine 30-inch HDPE outfall pipes through the existing berm, placed 60-mil HDPE liner at up to 5 acres per shift, and brought in 425,000 cubic yards of clay and 400,000 cubic yards of topsoil for the final cover. The project logged 70,000 safe self-perform man-hours with zero injuries.
Scope of Work
- Clearing of vegetation and demolition of ash pond infrastructure
- Large-scale dewatering and stormwater maintenance
- Over 1,700,000 cy of ash excavation, up to 15,000 cy per shift
- Large-scale quicklime drying and stabilization of unsuitable ash
- Installation of 9 new 30” HDPE outfall pipes through the existing pond berm
- 278 acres of 60 mil HDPE liner and 16 oz. geotextile, up to 5 acres per shift
- 425,000 cy of imported clay cover
- 400,000 cy of imported topsoil
- 278 acres of seed and mulch
- 70,000 safe self-perform man-hours, 0 injuries project-wide