ENTACT, LLC services

ISS technology is a core competency of ENTACT. Our combination of in-house treatability services coupled with our experienced technical staff and hands-on project management of in-house field crews, and use of company owned equipment allows ENTACT to provide true turn-key ISS solutions. Our ISS experience includes bucket mixing with excavators (usually when strength and perm are not as critical), horizontal auger mixing with Lang Tools or ENTACT-units (when strength and perm are critical, but on shallower applications), or vertical mixing with large diameter augers (used for deeper applications where greater torque is needed to overcome the overburden weight and induced stress, and for injection grouting continuously below the surface at various pressures).

ENTACT has performed numerous projects involving excavation of sediments, soils replacement, channel configuration and stabilization, construction of predation barriers, habitat construction, and restoration planting for both emergent freshwater wetlands and tidal marsh regimes. Our crews are proficient in managing storm water and tidal influences encountered in salt marshes and tidal mud flats where earthworks are exposed to the inundation of natural flows. We also have experience performing complex sediment remediation jobs where the removal and segregation of contaminated media must be restricted from migration outside the work area. Our projects have included construction of waterway bypass systems, coffer dam structures, and waterway re-construction in varying degrees of complexity to enable sediment removal activities to occur. These projects have been performed in a diverse array of environments, climatic conditions, and geologic settings.

Earthwork and material management activities are at the core of nearly every project ENTACT executes. Our diverse experience includes excavation; material management, screening and handling; sheet pile or shoring support systems; dewatering; wet soil conditioning; debris removal and management; waste material transportation and disposal; and precision re-grading and site restoration.

Excavation, earth retention and dewatering systems, stormwater management controls, conveyance, and collection systems, demolition, revegetation.

Solidification/stabilization, chemical fixation, chemical oxidation, bioremediation, wet soil conditioning, permeable reactive barriers.

Composite Capping Systems. Soil Covers. CAMU and Cell Construction. Slurry Wall Construction.

Mechanical Dredging. Coffer Dams. Dewatering and Treatment. Subaqueous Barrier Placement. Stream Realignment and Bank Stabilization. Wetlands Mitigation.

Ground Improvement. Structural Support. Excavation Support. Earth Retention Systems. Sheet Pile Installation. Slurry Wall Construction. Intercept Trenching.

The industry utilizes a number of different acronyms to describe vertical auger mixing including: DSM (Deep Soil Mixing), SAM (Single Axis Mixing), or ISS (In-Situ Solidification/Stabilization). ENTACT performs soil mixing with large diameter augers (typically 3 to 12 ft in Diameter) equipped with mixing paddles and grout ports. As the auger is advanced into the ground, grout is pumped through the ports and mixed with existing soil, resulting in a uniform stabilized mass capable of supporting a cap, or other construction activities. Mix designs are performed in our in-house treatability laboratory to insure optimal reagent selection, and pilot studies may be performed prior to full scale implementation. ENTACT owns specialized equipment for reagent handling, mixing, and delivery, and has relationships with key suppliers to insure competitive pricing and uninterrupted delivery.

Shallow Soil Mixing – Mass Solidification. Deep Soil Mixing. Wet & Dry Soil Mixing. Soilcrete Columns. Overlapping Columns. In-Situ Gravity Retaining Walls. Excavator Bucket Mixing.