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Environmental and Geotechnical Construction Services


Geotechnical Construction

For over 28 years, ENTACT has been committed to the successful creation and implementation of environmental and geotechnical construction solutions. Working with a variety of clients, from industrial to commercial to governmental, we provide the geotechnical expertise to address subsurface scopes. Our industry-leading personnel has the proven experience to complete the most challenging projects, providing a full suite of solutions to expertly manage every detail from start to finish.

Ground Stabilization / Settlement & Liquefaction Mitigation

  • Shallow Soil Mixing – Mass Solidification
  • Deep Soil Mixing
  • Wet & Dry Soil Mixing
  • Soil-Cement Columns
  • Overlapping Columns
  • In-Situ Gravity Retaining Walls
  • Shallow Excavator Mixing
  • Hydraulic cut-off walls

Earth Retention / Structural Support

  • Steel, Vinyl, & HDPE Sheet Pile Walls
  • Benching & Sloping
  • Trench Box & Slide Rail Systems
  • Anchors & Tiebacks
  • Soldier Piles & Lagging
  • Self-Hardening Slurry Walls
  • Auger Cast Piling
  • Wet Soil Mixing
  • Cement/Slurry Grouting

Barrier Walls (Cut-Off Walls)

  • Soil–Mixed
  • Soil-Bentonite
  • Cement-Bentonite
  • Soil-Cement-Bentonite
  • Slag Cement—Portland Cement-Bentonite

Excavation Support Systems
ENTACT work often occurs at depths or locations that require installation of various support systems to ensure the integrity and stabilization of the work area or surrounding structures. We utilize and self-perform benching/sloping, trench boxes, slide rail shoring, and sheet pile installations to allow our work to proceed. When there is a civil construction element that ENTACT cannot self-perform directly we subcontract specialty expertise.

Slurry Wall Construction

ENTACT has constructed several million square feet of slurry wall for various applications utilizing seasoned field crews and company owned specialty equipment including long reach excavators, extended sticks and booms, slurry mix tanks, silos and pumps. We have experience with slurry wall construction using a variety of materials including native and imported soil, bentonite, cement, slag, and polymers, in various combinations. Our experienced specialty equipment operators and field engineers, supported by our in-house treatability and geotechnical lab, consistently deliver a quality product meeting project requirements and quality control objectives.

ENTACT’s capabilities include:

  • Soil-bentonite, cement-bentonite, soil-cement-bentonite, and composite slurry cut-off wall installations
  • In-situ auger soil mixed column walls
  • Biodegradable biopolymer slurry trenches for groundwater extraction, site dewatering and/or treatment injection systems
  • Funnel and gate and permeable reactive barrier (PRB) groundwater treatment systems

Featured Projects

Aggregate Miner Slurry Program

  • Replaced existing defective cutoff wall for sealed water storage reservoir
  • 9,080 FT soil-bentonite slurry wall to depth of 65 FT bgs
  • Keyed 4-6 FT into underlying bedrock
  • Awarded and completed an additional 7,438 FT soil-bentonite slurry wall to a depth of 29.4 FT bgs
See full case study

Slurry Wall and Cap Construction OU2

  • Three separate soil-bentonite slurry cutoff walls around perimeter of perched water WMA’s
  • Combined length of 6,074 FT to a depth ranging from 17-45 FT bgs
  • Permeability of not greater than 1 x 10-6 cm/s

Former Wood Treating Site Corrective Measure Implementation

  • 52-acre former wood treating facility
  • 2,200 LF soil-bentonite slurry wall to a depth of 45 FT bgs
  • Permeability of not greater than 1 x 10-7 cm/s

Former Wood Preserving Superfund Site

  • 2,960 FT soil-bentonite slurry wall to a depth ranging from 42-53 FT bgs
  • Permeability of not greater than 1 x 10-7 cm/s