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Environmental and Geotechnical Construction Services
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Services

Coal Ash Impoundment & Landfill Closure

ENTACT’s unique skill sets, specialized equipment, and experienced personnel are ideally suited to assist our clients with safe and cost-effective disposition of their Coal Combustion Residuals. Our 27 years of hands-on experience in environmental remediation, including constructing composite liner systems and handling impounded and landfilled residuals, has resulted in superior material handling, solids management, and storm and groundwater management skills. Additionally, our geotechnical construction capabilities allow us to address dam safety, slope stability and seepage control issues with company owned equipment and seasoned operators.

ENTACT Resources

  • In-House Project Management, Field Engineers, Health and Safety Officers, Superintendents, Equipment Operators, Technicians
  • Large Fleet of Standard Heavy Equipment
  • Specialty Soil Mixing and Stabilization Rigs and Attachments, Dewatering, Slurry Wall, and Sheet Pile Installation Equipment
  • Low Ground Pressure Equipment
  • In-House Bench Scale Treatability Lab
  • Fully Integrated Project Management, Scheduling, Quality Assurance, and Safety Programs

Dewatering and Water Treatment
ENTACT has technical expertise designing and installing various dewatering and water treatment system based on site specific needs. Dewatering systems may include well point extraction systems, portable point source dewatering devices (both pumps and vacuum trucks), sump construction, and in-situ soil mixing with reagents for soil moisture reduction. We have permitted, assembled, and operated water treatment systems to treat collected site water impacted with particulates, metals, and organics prior to discharging to municipal waste water treatment plants or other permitted discharge points. We can also implement more sophisticated technologies where long term or large scale dewatering is required, including biopolymer trenching techniques for groundwater diversions, deep drains and extraction systems, and more.

Ash Management
In-situ and ex-situ solidification/stabilization efforts are enhanced by our understanding of crusted ash volume, liquid ash volume, and moisture content, with optimal mix designs completed at our in-house treatability laboratory. As a national service provider of remedial and geotechnical construction services, we are familiar with state and federal regulations related to ash management units and geographically positioned to offer efficient mobilization.

Wet Ash Conditioning
With 27 years of environmental remediation experience, we are well-versed with state and federal regulations related to ash management. With wet ash conditioning, the ash is mixed with wastewater such as highly saline effluents generated from water treatment processes to produce a slurry with controlled density that is then hydraulically transported to the ash dams. The slurry is allowed to settle and the ash-water is either drained away, or percolates through the ash dam and is collected in a toe drain.

Landfill Construction
ENTACT has industry-leading expertise in landfill construction as well as remediation and closures. Our skill set includes clearing and grubbing, erosion controls, excavation, clay lining, geosynthetic liner installation, drainage layer, geotechnical expertise, gas and leachate collection systems, storm water drainage, protective cover, revegetation, seeding, and all associated roadwork and infrastructure.

All Services

Environmental Remediation

Environmental Remediation

  • Excavation
  • Stormwater Management & Erosion and Sediment Controls
  • Earth Retention
  • Dewatering Systems and Water Treatment
  • Demolition
  • Cap & Containment
  • Sediment Removal & Wetland Restoration
Geotechnical Construction Services

Geotechnical Construction Services

  • In-situ Solidification/Stabilization
  • Chemical Fixation
  • Chemical Oxidation
  • Chemical Reduction
  • Bioremediation
  • Wet Soil Conditioning
  • Permeable Reactive Barriers
Soil Mixing

Soil Mixing

  • In-situ Solidification/Stabilization
  • Chemical Fixation
  • Chemical Oxidation
  • Chemical Reduction
  • Bioremediation
  • Wet Soil Conditioning
  • Permeable Reactive Barriers
Soil Mixing

Soil Mixing

  • In–Situ & Ex–Situ Treatment
  • Solidification/Stabilization
  • Chemical Fixation
  • Chemical Oxidation
  • Bioremediation
  • Wet Soil Conditioning
  • Permeable Reactive Barriers
LNG

LNG

  • Deep Soil Auger Mixing
  • Shallow Excavator Mixing – Mass Solidification
  • Wet & Dry Soil Mixing
  • Soilcrete Columns
  • Soil-Cement Columns for Tank Pad Support
  • Overlapping Columns
  • In-Situ Gravity Retaining Walls