Closing a Superfund Gypstack the Right Way
What Phosphate Operators Can Learn from COMANCO’s Mississippi Closure
Superfund gypstack closures leave no room for shortcuts. Every acre, seam, and transition must perform long after construction ends. At a major phosphate site in Mississippi, COMANCO is delivering a closure that reflects what modern phosphate remediation demands.
This phase of the project included a 72-acre gypstack, a 47-acre stormwater pond, and nearly 50 acres of water return ditches. Across each phase, COMANCO installed millions of SF of geosynthetic liner and ClosureTurf® to create a stable, low-maintenance, long-term closure system.
What sets this project apart is not just its size. It is the execution. Crews installed over 5 million SF of Super Gripnet liner and nearly 5 million SF of ClosureTurf® under high heat, frequent rain, and evolving site conditions. Progress never stalled because the system, sequencing, and crew leadership were built for complex phosphate work.
The ClosureTurf® System provides more than surface protection. Topped with a sand ballast layer, it delivers UV resistance, stormwater control, and long-term stability without relying on vegetative cover. For phosphate operators, this means reduced runoff, lower maintenance demands, and meaningful operational cost savings year after year.
Before closure, the site spent millions annually managing stormwater from the gypstack. This system changes that equation. It also reduces long-term environmental risk and provides confidence that the closure will perform as intended.
Under the leadership of Superintendent Carlos Garcia, the COMANCO crew carried the project through its final phase with the same focus that defined the work from day one. This is not just a completed closure. It is engineered performance on a Superfund site, delivered by crews who understand the realities of phosphate operations.
For operators planning future closures, expansions, or remediation work, this project reflects what capable phosphate construction looks like today.
SAFETY ★ QUALITY ★ SERVICE
COMANCO is an environmental, commercial, and civil construction company specializing in constructing containment facilities.
COMANCO continues to lead the way in safe and sustainable closure projects across the country. Our work at this Mississippi phosphate plant demonstrates the impact of innovative systems like ClosureTurf® in protecting the environment and reducing long-term costs. Our crews remain dedicated to delivering quality results while maintaining the highest safety standards. Contact COMANCO to learn how we can support your next environmental project.
4301 Sterling Commerce Dr, Plant City, FL 33566
(813) 988-8829 | www.comanco.com