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Environmental and Geotechnical Construction Services
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Services

Environmental Remediation

ENTACT is truly unique in our industry. We are a direct self-performer of environmental remediation services that also possesses significant internal professional resources in the geosciences, regulatory compliance, and civil engineering disciplines. These resources are dedicated to the enhancement of our field services implementation, and to the application of innovative technologies. This translates to safe, high-quality, and cost-effective work for our clients.

Our core competencies include:

Excavation
Mass excavation and handling of difficult materials is an ENTACT core competency. We possess the appropriate personnel and equipment resources necessary to excavate, segregate, dewater, sort, crush, size, treat, moisture condition, and arrange disposal of hard-to-manage materials. ENTACT has successfully completed numerous large-scale excavation and material handling projects on a national level demonstrating our ability to deliver our client’s safety, schedule, and financial project objectives.

Stormwater Management & Erosion and Sediment Controls
ENTACT has significant experience planning and implementing effective stormwater management and erosion and sediment controls prior to conducting land disturbing activities. Controls may include conveyance and collection systems, detention pond and underdrain systems, retention ponds, catch basins, drop inlet structures and manholes, diversion and conveyance channels, swales, piping, and silt fence. ENTACT can prepare and implement Soil Erosion and Sediment Control Plans and Stormwater Pollution Prevention Plans and fulfill permitting requirements.

Earth Retention
ENTACT projects often include excavation and soil management at depths or locations that require installation of various support systems to ensure the integrity of the work area or surrounding structures. We utilize and self-perform OSHA compliant benching and sloping, slide rail and trench box shoring, and sheet pile installations to allow our work to proceed. ENTACT owns an ABI MobilRam capable of installing most if not all industry common shoring/earth retention materials (sheet pipe, beams, plates, etc.). Our ABI MobilRam is operated and maintained by a team of highly experienced personnel familiar with this specialized equipment.

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 (pumps and vacuum trucks), and sump construction. We have permitted, assembled, and operated water treatment systems to collect and treat impacted site water 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.

Demolition
ENTACT has extensive experience with diverse methods of decommissioning, decontamination, demolition, and debris management at both closed and active facilities. Demolition methods include non-explosive mechanical methods such as deconstruction, sawing, shearing, and breaking utilizing multi-processors, grapples, claws, and shears. Demolition debris management may include universal waste removal and disposal; on site sorting, crushing, segregating, and debris management; off-site transportation and disposal; and recycling of salvageable materials.

Cap & Containment
ENTACT has successfully performed cap and containment system construction at sites throughout the United States. Our experience includes construction of Corrective Action Management Units (CAMUs), engineered containment cells, repositories, RCRA compliant cap systems, geosynthetic and conventional soil covers, and phytoremediation caps. Ancillary to capping and containment systems, ENTACT has installed leachate collection, leak detection, and gas venting systems; and erosion control and storm water management, collection and conveyance systems. We also self-perform turnkey design work and provide design support to our clients utilizing our in-house regulatory, geotechnical and engineering resources.

Sediment Removal & Wetland Restoration
ENTACT possesses significant and diverse experience performing sediment remediation, wetland restoration, habitat restoration, and revegetation on a national basis for private industry clients. Our projects have included in-situ stabilization/solidification, removal, and subaqueous capping of impacted sediments from a wide array of water body systems including lakes, rivers, streams, creeks, tributaries, flash flood basins, coves, marshes, ponds, and lagoons. ENTACT owns and operates specialty equipment for work in saturated soils and flooded conditions. We have successfully employed various methods of sediment removal and remediation in the wet or dry including heavy equipment on crane mats and floating barges; low ground pressure marsh buggies and pontoon-mounted excavators; sheet pile, cofferdam and temporary dam systems; and hand-removal as needed in equipment-prohibitive areas.

Mechanical Dredging
ENTACT has been providing expert mechanical dredging services for 27 years. We offer extensive equipment resources and industry-leading personnel to carry out both large-scale and small-scale environmental remediation projects requiring dredging operations.

Cofferdams
ENTACT has vast experience designing and installing cofferdams for remedial activities that require excavation within a body of water or below the water level. Typical cofferdam designs include installation of sheet piling around the work area, securing the structure with wales and cross braces as needed, and dewatering the enclosed area to provide workers with a dry working environment. ENTACT’s geotechnical expertise allows us to determine the ideal solution and design for projects requiring a cofferdam.

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.

Subaqueous Barrier Placement
With 27 years of expertise in environmental remediation, ENTACT has developed the skill for controlled, accurate placement of clean isolating material to isolate, cover or cap contaminated material at a sediment remediation site or an open-water disposal site. ENTACT is typically responsible for delicate and sensitive material placement, establishing natural contour, fine grading, and revegetation of affected areas on project sites.

Stream Realignment and Bank Stabilization
ENTACT owns and operates specialty equipment for working in stream beds, saturated soils and flooded conditions. We have successfully employed various methods of sediment removal and remediation in the wet or dry including heavy equipment stationed on crane mats and floating barges; low ground pressure marsh buggies and pontoon-mounted excavators; sheet pile, cofferdam, and temporary dam and bypass systems; and hand-removal in equipment-prohibitive areas.

Wetlands Mitigation
ENTACT understands through experience the delicate balance of remediation and restoration as it applies to sensitive areas and sensitive receptors. Utilizing experienced field personnel in conjunction with local consultants and restoration ecologists who are experts in their field has proven a successful approach for wetland and habitat restoration. Our experience includes uplands and wetlands restoration at sites across the country located in different geologic and climatic regions. Specific work has included channel configuration and stabilization, construction of predation barriers, habitat construction, and restoration planting and seeding for both emergent freshwater wetlands and tidal marsh regimes.

All Services

Environmental Remediation

Environmental Remediation

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

Geotechnical Construction Services

  • Ground Stabilization / Settlement & Liquefaction Mitigation
  • Earth Retention / Structural Support
  • Coal Ash Impoundment & Landfill Closure
  • Environmental Remediation Applications
  • Ground Improvement for Construction
  • Barrier Walls
  • Sheet Pile Installation
Soil Mixing

Soil Mixing

  • In-situ Solidification / Stabilization
  • Chemical Fixation
  • Chemical Oxidation
  • Chemical Reduction
  • Bioremediation
  • Wet Soil Conditioning
  • Permeable Reactive Barriers
Coal Ash Impoundment & Landfill Closure

Coal Ash Impoundment & Landfill Closure

  • Dewatering and Water Treatment
  • Ash Management
  • Wet Ash Conditioning
  • Landfull Construction
LNG – Ground Improvement Services

LNG – Ground Improvement Services

  • 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