Coal Ash Pond Liners & Caps

Coal Ash Pond Capping and Liner Installation

Plastic Fusion Fabricators installs the geomembrane caps and liners for coal ash pond closure. When a utility closes a coal combustion residual (CCR) impoundment, the geomembrane is what permanently seals it — the cap-in-place final cover that keeps rainwater and groundwater out of the stabilized ash, or the liner for the lined disposal unit the ash is moved to. We install fusion-welded HDPE and LLDPE geomembrane caps and liners engineered to the CCR Rule and built to contain coal ash for the long term. With 40+ years installing geomembrane containment across 24 states, Plastic Fusion is the capping and lining contractor for CCR closure.

Closing a coal ash pond is a complex, multi-year, multi-billion-dollar effort, and it takes a team: dewatering and water-treatment specialists remove and treat the contaminated water, the ash is stabilized, and engineers design the closure. Plastic Fusion installs the geomembrane component — the part that permanently seals the ash from the environment. We’re not the dewatering or water-treatment contractor; we’re the geomembrane specialist that installs the cap or liner that makes the closure permanent, working alongside the rest of the closure team.

The Geomembrane in CCR Closure

There are two primary CCR closure paths, and both depend on geomembrane:

• Cap-in-place closure — the dewatered, stabilized ash is sealed in place under an engineered final cover: a low-permeability geomembrane cap with drainage and a protective cover system that prevents rainwater infiltration and eliminates the exposure pathway. This is the same engineered capping discipline used for landfill caps, applied to coal ash impoundments.
• Clean closure (excavation) — the ash is excavated and moved to a federally compliant lined disposal unit. That unit needs a composite liner system to contain the ash and protect groundwater, built to RCRA Subtitle D and CCR standards.

Either way, the geomembrane is what stands between the coal ash and the groundwater — and installing it correctly, with fusion-welded and tested seams, is what makes the closure compliant.

What We Install for Coal Ash Ponds

• Cap-in-place final cover systems — geomembrane cap, drainage, and cover for sealing ash in place
• CCR disposal unit liners — composite liner systems for lined landfills and disposal cells
• Engineered containment liners — for new or retrofit CCR containment
• Gas and drainage integration — penetrations, drainage layers, and detailing built into the cap or liner

Coal ash ponds are one of the most demanding applications in our pond and containment liner work — high-stakes, heavily regulated, and unforgiving of seam failures.

Built to the CCR Rule

Coal ash closure is governed by EPA’s 2015 Coal Combustion Residuals (CCR) Rule and RCRA Subtitle D, with the cap or liner required to meet specific permeability and performance standards. Every cap and liner we install includes full construction quality assurance — destructive and non-destructive seam testing, deployment records, and as-builts — documented for regulatory review. We work directly with the closure engineers and CQA consultants managing the project.

Materials

We install HDPE and LLDPE geomembrane for coal ash caps and liners, with RPP where reinforced performance is needed. HDPE provides the chemical resistance and durability that CCR containment demands; LLDPE offers the flexibility and conformance that capping a settling ash mass often requires. Material and thickness are specified to the closure design and the regulatory standard.

The Geomembrane Contractor, Not the Water Treatment Firm

Coal ash closure brings together several specialties — dewatering, water treatment, stabilization, and geomembrane installation. Plastic Fusion is the geomembrane contractor. We install the cap or the liner that permanently seals the ash, and we coordinate with the dewatering and treatment teams handling the water side. If you’re a utility, an EPC, or an engineering firm managing a CCR closure and you need the capping or lining installed by a geomembrane specialist with the crews and CQA to pass inspection, that’s what we do.

Why Utilities and Engineers Choose Plastic Fusion

• 40+ years installing geomembrane caps and liners
• The geomembrane specialist within the CCR closure team
• Cap-in-place and lined-disposal capability
• Fusion-welded HDPE and LLDPE with documented CQA on every seam
• Built to the CCR Rule and RCRA Subtitle D
• In-house fabrication of penetration and drainage details
• Active projects across 24 states with nationwide mobilization

Industries Served

Plastic Fusion installs coal ash caps and liners for electric utilities and power generators closing CCR impoundments, the EPC and environmental engineering firms managing those closures, and the construction teams executing them. We integrate with the dewatering, water-treatment, and design specialists on the project and deliver the geomembrane cap or liner.

Coal Ash Pond FAQs

Does Plastic Fusion do coal ash pond remediation?

Plastic Fusion installs the geomembrane portion of coal ash closure — the cap-in-place final cover and the liners for lined disposal. The broader remediation work — dewatering, water treatment, heavy-metal removal, and ash stabilization — is handled by water-treatment and remediation specialists. We work alongside those teams and install the cap or liner that permanently seals the ash. If your project needs the geomembrane capping or lining done right, that’s our scope.

What is cap-in-place closure?

Cap-in-place is a CCR closure method where the coal ash is dewatered and stabilized, then permanently sealed under an engineered final cover rather than excavated. The cover is a multi-layer system — typically a low-permeability geomembrane cap, a drainage layer, and a protective cover — that keeps rainwater and groundwater from moving through the ash and carrying contaminants. Plastic Fusion installs the geomembrane cap and drainage components of cap-in-place closures.

What’s the difference between capping and lining a coal ash pond?

Capping seals ash in place under a final cover (cap-in-place closure). Lining provides the barrier beneath ash in a disposal unit — used when ash is excavated and moved to a lined landfill (clean closure), or when building a new lined CCR unit. Capping keeps water out from above; lining keeps contaminants from migrating below. Plastic Fusion installs both, depending on the closure approach.

What regulations govern coal ash pond closure?

Coal ash closure is governed by EPA’s 2015 Coal Combustion Residuals (CCR) Rule and RCRA Subtitle D. These set the requirements for closure method, cap and liner performance, groundwater monitoring, and documentation. The geomembrane cap or liner must meet specific permeability and CQA standards, and Plastic Fusion installs and documents to those requirements.

Request a Quote

If you’re closing a coal ash impoundment by cap-in-place or relocating ash to a lined unit, Plastic Fusion installs the geomembrane cap or liner that makes the closure permanent and compliant. Contact us with your closure details for a quote.