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Environmental and Geotechnical Construction Services

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.

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.

Dewatering & Water Treatment
One of the most critical elements of a successful soil remediation project is the ability to manage groundwater, surface water and process liquids encountered during excavation. ENTACT possesses the technical expertise in excavation dewatering, on-site water treatment, and procurement of applicable discharge permits.  We are capable of implementing a variety of dewatering technologies as dictated by project conditions including design and installation of fixed well point systems and portable dewatering systems using pumps and vacuum trucks.  Where long term or large scale dewatering is required, more sophisticated technologies may be implemented including deep drains and extraction systems, biopolymer trenching techniques for groundwater diversions, vertical slurry wall cut-off barriers, cut-off walls, and deep soil mixing vertical barriers. Our vast water treatment experience includes assembly and maintenance of water treatment trains to handle a variety of contaminants including organics (suspended solids reduction, carbon adsorption, particulate removal), inorganics (metals precipitation, filtration/removal of sediments), and NAPL (oil/water separation, free-product removal, adsorption, sand filtration, air stripping).

Decommissioning, Decontamination & Demolition
ENTACT has safely, efficiently, and cost-effectively performed decommissioning, decontamination and demolition of petroleum industry terminals, tank farms, refineries, manufacturing facilities and smelting facilities within the US, Canada and select international locations. Our diverse capabilities include full facility closure; active facility cleaning; equipment decontamination, dismantlement and removal; underground pipe cleaning and removal; asbestos and lead based paint abatement; demolition debris management and disposal; and above ground and underground storage tank decontamination and removal.  Demolition methods include non-explosive mechanical methods such as deconstruction, sawing, shearing, and breaking utilizing multi-processors, grapples, claws, and shears. Demolition debris and waste management includes universal waste removal and disposal; on site sorting, crushing and segregating of demolition debris; off-site transportation and disposal; and recycling of salvageable materials.

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.

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 over 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
One of the most critical elements of a successful soil remediation project is the ability to manage groundwater, surface water and process liquids encountered during excavation. ENTACT possesses the technical expertise in excavation dewatering, on-site water treatment, and procurement of applicable discharge permits.  We are capable of implementing a variety of dewatering technologies as dictated by project conditions including design and installation of fixed well point systems and portable dewatering systems using pumps and vacuum trucks.  Where long term or large scale dewatering is required, more sophisticated technologies may be implemented including deep drains and extraction systems, biopolymer trenching techniques for groundwater diversions, vertical slurry wall cut-off barriers, cut-off walls, and deep soil mixing vertical barriers. Our vast water treatment experience includes assembly and maintenance of water treatment trains to handle a variety of contaminants including organics (suspended solids reduction, carbon adsorption, particulate removal), inorganics (metals precipitation, filtration/removal of sediments), and NAPL (oil/water separation, free-product removal, adsorption, sand filtration, air stripping).

Subaqueous Barrier Placement
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’s scope of work typically includes 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.

Manufactured Gas Plant (MGP) Site Remediation
ENTACT has successfully remediated a significant number of MGP sites across the nation. We are particularly accustomed to executing high profile MGP remediation projects in metropolitan environments where odor, noise, dust and traffic control are critical priorities to ensure our clients’ objectives are met. Our vast MGP specific experience includes demolition of above grade and subsurface structures including foundations, gas holders, tar pits, containment structures, and piping; erection and maintenance of temporary fabric structures with air exchange systems; installation of earth retention systems; installation and operation of dewatering and water treatment systems; in-situ solidification/stabilization and deep soil mixing; ex-situ soil solidification and conditioning; implementation of odor and dust controls; and various site restoration efforts.

Pipeline Abandonment & Removal
ENTACT has successfully abandoned and removed miles of below and above ground pipelines as part of project scopes, including pipelines servicing active and inactive refineries, oilfields, manufacturing facilities, manufactured gas plants, within right-of-ways, and residential properties. Our vast experience in pipeline management includes isolating, removal and disposal of contents, abandoning in place by plugging, or complete removal by cutting and disposing or recycling.  We have safely and efficiently abandoned and removed various types of metal, concrete, plastic, and ACM insulated pipelines, valves and appurtenances in a wide range of diameters.

Coal Ash Impoundment & Landfill Closure
ENTACT’s combined experience with large scale ash pond dewatering, mass relocation and grading of impounded residual ash, construction of low permeability cover systems, and installation of temporary and permanent stormwater controls makes us ideally suited to provide clients with safe and cost-effective management and disposition of Coal Combustion Residuals. Our seasoned field crews utilizing company owned specialty equipment, including GPS equipped dozers and excavators, provide superior material handling, solids management, grading and compaction, and storm and groundwater management skills.  Additionally, we possess the geotechnical expertise needed to assist clients with slope stability and seepage control issues. [Learn more about our Coal Ash Expertise]

Mine Reclamation and Remediation
ENTACT has provided national reclamation and remediation services to the mining industry for over 27 years.  Our experience includes smelter closures, earthwork/mine reclamation, decommissioning and demolition of mine and mill structures at active and abandoned facilities, mass excavation of metal impacted soil and mine tailings, repository construction and capping for on-site disposal of impacted material, mine shaft capping, on-site borrow area management, site grading and restoration, and implementation of erosion and sediment controls. Coincident to the reclamation and remediation of the mine and smelter sites, ENTACT has remediated hundreds of adjacent residential and private properties impacted by heavy metals.

Residential Remediation
ENTACT has remediated thousands of residential lots, neighborhood parks, schools, and other residential zoned properties across the nation. ENTACT successfully executes these community sensitive projects by applying decades of experience, lessons learned, and proven operational efficiencies. We have established a dedicated Residential Remediation Program within our organization to ensure the level of focus, attention, and project execution necessary to sustain our solid reputation as an industry leader. Every successfully remediated property has increased our efficiency and ability to implement safe and cost-effective solutions to these unique remediation projects.

Permeable Reactive Barriers
A permeable reactive barrier is a zone of reactive material that extends below the water table to intercept and treat contaminated groundwater. ENTACT has the in-house expertise to evaluate the geochemical, hydrogeological, and microbiological factors that govern the performance and functioning of these barriers. Understanding these factors is necessary in order to predict the longevity of our solutions, conduct economic analysis, and optimize this groundwater cleanup technology for a wide variety of hazardous compounds.

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 prepares and implements Soil Erosion and Sediment Control Plans and Stormwater Pollution Prevention Plans, and fulfills permitting requirements.

In-House Treatability Laboratory
To support our solidification/stabilization work, ENTACT has a fully functional bench scale treatability/geotechnical laboratory that is capable of tackling any type of study for impacted and non-impacted media, regardless of waste stream. This resource enables ENTACT to control costs and, more importantly, control the quality of the study.

Specific services provided by our laboratory include:

  • Material Homogenization
  • Sample Aliquot Preparation and Weighing
  • Reagent Weighing
  • Dry and Slurry Reagent Blending
  • Cylinder and Sample Preparation