SKILLS &     SERVICES
ENTACT Skills and Services Include Residential Lot Remediation, Sediment Removal, Wetlands Re-Creation, Soil Treatment, Groundwater Remediation, Water Treatment, Barrier Wall Construction, Cap and Containment System Construction, and more!
Former MGP Remediation
Former Manufactured Gas Plant (MGP) Remediation
  • Odor Control and Vapor Management Systems
  • Temporary Structures and Enclosures
  • Subsurface Structure Demolition
  • Free Product Recovery
  • Removal of Coal Tar Waste, Debris and Residual Materials
  • Soil Solidification and Stabilization

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Project Descriptions
Former MGP Site
Former MGP Remediation
  • Coal tar impacted ravine abutting the river in preparation for residential redevelopment
  • Installation of a dewatering and treatment system in combination with sheet pile wall
  • Treatment and discharge of collected groundwater
  • Excavation, solidification, and off-site disposal/thermal processing of 10,000 tons of coal tar residuals and contaminated soil
  • Earth retention system extended 600 lineal feet consisting of cantilevered sheet piling and tie backs
  • Sheet pile was installed by vibratory methods to an average depth of 24 feet bgs
[Close Full Story]

ENTACT implemented remedial action to address a coal tar impacted ravine abutting a river in preparation for residential redevelopment. Scope of work included excavation and stockpiling of clean overburden soils to allow installation of a sheeting wall; installation of a dewatering and treatment system installed in combination with the sheet pile wall; treatment and discharge of collected groundwater; excavation, solidification, and off-site disposal/thermal processing of 10,000 tons of coal tar residuals and contaminated soil; and site backfill, grading, and restoration.

ENTACT re-designed the steel sheet pile wall, which was a critical element of the project approach, to key into bedrock as well as hard-pan glacial till (with Toe Pins) without internal rakers allowing for greater flexibility within the ravine. A portion of the wall was designed to be left in place as a cut off wall for inaccessible waste materials. Specialized steel sheets were pre-injected with a hydrophilic (VOC resistant) expanding polymer to ensure a water-tight seal. The ravine required a 24-hour dewatering effort with all surface and groundwater running through a treatment system designed to remove particulate and organics. In excess of 670,000 gallons of water was treated and discharged. All work was performed during real time air monitoring activities. ENTACT utilized foam odor suppressants, good work practices, and daily soil cover to control odors.


Former MGP Site

Former MGP Remediation
  • 11-acre MGP Site bounded by businesses/residential
  • Phase I scope - installation of 130 LF of sheet pile (40 FT) to enable removal of impacted wet sand near an active rail line; and pre-trenching 450 LF of drive-line for installation of Waterloo Barrier; management of utilities and implementation of complex traffic plan
  • Phase II scope - excavation, conditioning, and management of 80,000 tons of MGP derived waste
  • Initial excavation - shallow cut (8 FT bgs) to remove surficial impacts/obstructions
  • Final excavation - up to 25 feet bgs utilizing earth retention systems/cofferdams
[Close Full Story]

ENTACT remediated this former MGP site located along a navigable waterway and adjacent to a residential neighborhood. Scope of work included decontamination and demolition of various above-ground structures, subsurface tar wells, gas holders, and pier; installation of sheet pile and cofferdam system to prevent failure of riverbank and ensure structural integrity of an on-site building during excavation activities at depths up to 26 feet below the river level; dewatering of excavation areas, containment, and transport to an on-site water treatment system; excavation, on-site solidification, and off-site disposal of over 80,000 tons of coal tar impacted materials and MGP wastes; and site backfilling and restoration. Additional activities included removal of a gas holder, soils and sludges from inside a warehouse that required level B PPE.

Company Resources - Team ENTACT

Odor Control - Odor control at an MGP remediation site is often handled through the use of spray foam. Foam can be applied in wet or moist conditions to form a consistent encapsulating layer between contaminated materials and the environment, suppressing VOCs, dust, and odors. In addition, airtight temporary structures, equipped with air handling and cleaning equipment can be part of an integrated remediation site odor control system.