SOIL REMEDIATION & BROWNFIELD REDEVELOPMENT

Geosynthetics play a crucial role in environmental soil remediation and redevelopment projects. They can function alone or as part of a treatment system to prevent pollutants from entering the environment. Impermeable geomembrane liners are typically used to line and cover a contaminated soil pile or to provide containment of a hazardous material. Geotextiles function as a filter allowing water to pass through them while limiting upward contaminant migration. Highly visible orange nonwoven demarcation geotextiles printed with the words “Do Not Dig” can be used as a cushion to protect the liner as well as preventing someone from digging and penetrating the cap. Drainage geocomposites provide a pathway for fluids and can be used to construct leachate collection systems.

There are a wide range of geosynthetic products on the market today, and choosing the right one can be challenging. What thickness is required?  Should I use a reinforced liner? Is a geotextile cushion layer to protect the liner also necessary? Can a panel be fabricated large enough to fit the area?  

Please contact our sales department at 609-971-8810 so we can help you choose material that is both cost-effective and fit for the application at hand.

Geosynthetics play a crucial role in environmental remediation and redevelopment projects. They can function alone or as part of a treatment system to prevent pollutants from entering the environment. Impermeable geomembrane liners are typically used to line and cover a contaminated soil pile or to provide containment of a hazardous material. Geotextiles function as a filter allowing water to pass through them while limiting upward contaminant migration. Highly visible orange nonwoven demarcation geotextiles printed with the words “Do Not Dig” can be used as a cushion to protect the liner as well as preventing someone from digging and penetrating the cap. Drainage geocomposites provide a pathway for fluids and can be used to construct leachate collection systems.

There are a wide range of geosynthetic products on the market today, and choosing the right one can be challenging. What thickness is required?  Should I use a reinforced liner? Is a geotextile cushion layer to protect the liner also necessary? Can a panel be fabricated large enough to fit the area?  

Please contact our sales department at 609-971-8810 so we can help you choose material that is both cost-effective and fit for the application at hand.

PRODUCTS WE USE IN THESE APPLICATIONS:

BROWNFIELDS & SUPERFUND SITES

Brownfields and Superfund sites are abandoned areas of land contaminated from activities previously undertaken at the site. The Brownfields Revitalization and Environmental Restoration Act of 2001 promotes both the cleanup and revitalization of these areas. Instead of consuming valuable open space and prime farmland, brownfield redevelopment recycles and reuses idle land. The once contaminated areas are transformed into “green spaces” and other recreational areas that benefit human health and the environment.

Brownfield cleanup efforts are generally the responsibility of state and local agencies while superfund sites are managed by the Federal government’s superfund program. The EPA locates, investigates and identifies the worst hazardous waste sites throughout the United States and places them on the National Priorities List (NPL).

  • Commercial properties – dry cleaners, gas stations, auto body shops
  • Industrial properties – old factories or warehouses
  • Federal Properties – closed military bases
  • Municipal waste landfills and hazardous waste dump sites

SOIL REMEDIATION OPTIONS

Property specific factors such as the contaminants and level of contamination on the site will  influence the selection of the cleanup remedy and type of control measures that are implemented. Traditional methods of excavating and hauling contaminated soils off-site to be treated and disposed of can be costly. Some projects allow for the contaminated material to treated on site and/ or contained in place. Engineered caps, mitigation barriers and collection systems are used to restrict exposure and eliminate further migration of the pollutants off-site.

Engineered Caps
  • Impermeable Caps:  A multilayer system of geosynthetics that includes an impermeable geomembrane liner, a geotextile cushion and/or separation layer and sometimes even a geocomposite drainage layer that all work together to prevent water from infiltrating downward and leaching contaminants into the groundwater or surrounding areas.
  • Low Permeable Caps: Creating and maintaining asphalt or concrete areas such as parking lots, roadways and building foundations that act
    as surface barriers or caps over contaminated soil. The low permeability cap prevents surface water infiltration and stabilizes the movement of contaminated soils.
  • Permeable Soil Caps: A portion of the contaminated soil is excavated and removed. An orange demarcation geotextile fabric is installed prior to backfilling. It acts as both a barrier and a filter, allowing water to pass through while limiting upward contaminant migration .  The area is then capped with 2-3 feet of clean fill soil for non-residential uses and 10 feet for residential uses. The orange demarcation fabric can be printed with the words “Do Not Dig” to warn future excavations of the presence of a contaminant.  
Leachate Collection Systems

The system directs and collects the contaminated leachate, and transports it offsite for disposal. Drainage geocomposites or geotextile filter fabrics are used to construct a pathway for fluids to move.

Groundwater Migration Barriers

Vertical barriers can be constructed to cut off the route and prevent the migration of contaminated groundwater or leachate from a property. Geomembrane liners can used alone or in conjunction with other technologies such as slurry walls to form an underground containment barrier.

Gas Barriers

The installation of a vapor barrier under buildings can minimize potential migration of volatile contamination to indoor air. Multi-layer geomembrane liners serve as innovative gas barrier solutions to prevent dangerous gases, including VOC’s from migrating to the surface and into our environment.

ISS (in-situ stabilization / solidification)

On-site remediation can typically involve the addition of binding agents to an area of sludge or wet soils. Repeated in-place mixing with the bucket of a backhoe or excavator stabilize the soils in place. Locking the contaminants into a structurally sound mass of solid material for capping is the goal.

PROJECT HIGHLIGHT

Project: Soil Remediation Project- Bridgeport, Connecticut

IWT Cargo- Guard recently supplied multiple erosion control and geosynthetic materials for a major soil remediation project in Bridgeport, Connecticut. The contaminated area was excavated down to an acceptable level and the hazardous soils were then transported off site to a disposal facility.  The project specifications required a high visibility demarcation layer or delineation layer to be installed to separate the contaminated soils from the clean soil. However, this layer still needed to allow water to pass while also serving as a visual barrier for future excavations.

Originally, the Engineering firm specified a standard 12 oz. nonwoven geotextile fabric covered with a layer of orange construction fence to provide the demarcation. This double layer system was not ideal due to labor costs.

brownfield remediation

IWT Cargo- Guard recently supplied multiple erosion control and geosynthetic materials for a major soil remediation project in Bridgeport, Connecticut. The contaminated area was excavated down to an acceptable level and the hazardous soils were then transported off site to a disposal facility.  The project specifications required a high visibility demarcation layer or delineation layer to be installed to separate the contaminated soils from the clean soil. However, this layer still needed to allow water to pass while also serving as a visual barrier for future excavations.

Originally, the Engineering firm specified a standard 12 oz. nonwoven geotextile fabric covered with a layer of orange construction fence to provide the demarcation. This double layer system was not ideal due to labor costs.

brownfield remediation
brownfield redevelopment

After working closely with the contractor, the Engineering firm, and the manufacturer, IWT Cargo-Guard decided that a special 12 oz. highly-visible Orange nonwoven geotextile demarcation fabric was the solution. The manufacturer, Propex Geosolutions, was able to run this special fabric eliminating the need for the construction fence and the extra layer of installation while still meeting the Engineer’s requirements.  While working closely with all parties involved, IWT Cargo-Guard was able to come up with a demarcation solution to reduce labor costs while providing a product that performed up to the stringent standards of the project.

To learn more about these products or how we can help with your project please contact our sales department at 609-971-8810.

After working closely with the contractor, the Engineering firm, and the manufacturer, IWT Cargo-Guard decided that a special 12 oz. highly-visible Orange nonwoven geotextile demarcation fabric was the solution. The manufacturer, Propex Geosolutions, was able to run this special fabric eliminating the need for the construction fence and the extra layer of installation while still meeting the Engineer’s requirements.  While working closely with all parties involved, IWT Cargo-Guard was able to come up with a demarcation solution to reduce labor costs while providing a product that performed up to the stringent standards of the project.

To learn more about these products or how we can help with your project please contact our sales department at 609-971-8810.

brownfield redevelopment

Disclaimer: These guidelines are for informational purposes only and are intended as illustration or general information only and are not intended as a guarantee or warranty. IWT assumes no responsibilities in connection with the use of this information.