FORMER FIBERBOARD FACILITY LOWLAND/IN-WATER OPERABLE UNIT IRAM
Project Highlights Dredging and processing of contaminated soil and sediment Installation of a 9-acre residual management layer Management, treatment, and continuous permitted discharge of contact water Construction of temporary haul roads, remedy protection berms, access roads, sediment processing, and water treatment facilities Restoration of more than 11 acres of disturbed areas, including 9 acres of wetland and habitat enhancement Remediation of arsenic, mercury, TCDD toxicity equivalents, petroleum hydrocarbons, and PAHs Sediment remediation and dredging ENTACT is executing an Interim Removal
LANDFILL REMEDIATION AND SLOPE STABILIZATION
Project Highlights 60,000 cubic yards of landfill waste excavated and transported for off-site disposal Remediation performed on a 140-foot-tall slope with localized gradients exceeding 1H:1V 30-foot-tall soil nail wall constructed to stabilize a historic landslide complex Accelerated design-assist-build project completed from partial design through construction within one year Final restoration included wetland construction, stormwater improvements, erosion control, and native planting ENTACT completed a complex design-assist-build landfill remediation and slope stabilization project involving large-scale waste excavation, geotechnical stabilization, and full site restoration under
MINE MULTI-YEAR RECLAMATION
ENTACT performed environmental remediation and water treatment activities at this high-altitude mine site for more than a decade. Located in a remote area of the Rocky Mountains region at nearly 11,000 feet in elevation, this project presented unique challenges including a short construction season, constrained access and workspace, alpine weather conditions, avalanche hazards, and the logistical limitations of a remote environment. Despite these conditions, ENTACT successfully constructed the first high-altitude wetlands in the world designed to treat acid mine discharge.
LNG EXPORT FACILITY SITE PREPARATION AND SOIL IMPROVEMENT
ENTACT performed large-scale soil stabilization services to support the construction of a liquefied natural gas (LNG) export facility on the Gulf Coast. The work provided a stable foundation for major site development activities, ensuring the ground improvement necessary to support future infrastructure and facility operations. Prior to full-scale implementation, ENTACT conducted soil sampling and developed soil-cement mix designs to achieve unconfined compressive strengths (UCS) for target values. Field pilot test sections were completed to confirm cement dosage requirements for meeting these
SANITARY LANDFILL CLOSURE – SUPERFUND SITE
ENTACT was engaged to perform closure of a 100-acre former sanitary landfill that previously operated as a sand and gravel quarry. The landfill closure was a Superfund site project. Over the site’s operational history, industrial and municipal wastes were deposited in the eastern portion of the site, while foundry sand and fly ash were placed in disposal areas across the western third. A public thoroughfare bisected the site, adding complexity to logistics and phasing. ENTACT executed a comprehensive environmental remediation
FORMER STEEL SITE CAMU CONSTRUCTION AND TAR PONDS STABILIZATION
ENTACT performed environmental remediation and geotechnical construction services at a former steel works facility in accordance with the state Department of Environmental Quality’s Resource Conservation and Recovery Act (RCRA) Closure-Post Closure Permit for facility-wide corrective action. This work supported future site redevelopment by consolidating and managing waste from multiple Solid Waste Management Units (SWMUs) into a newly constructed Corrective Action Management Unit (CAMU). The project included the design and construction of a 14-acre CAMU and associated infrastructure. ENTACT’s integrated approach
MANUFACTURING FACILITY BATTURE CORRECTIVE ACTION
ENTACT served as the lead contractor for a multi-year, on-water environmental remediation and levee protection project along the Mississippi River. The project involved the surgical removal of impacted materials from a batture area, while reinforcing a critical river flood protection levee and T-WALL structure that safeguards an active manufacturing facility. Work was conducted under a joint permit with federal, state, and local government entities with stringent requirements for levee stability, wetlands mitigation, surface water quality, and navigation. Scope of work
COAL-FIRED GENERATING STATION CCR POND CLOSURE ACTIVITIES
ENTACT was engaged to perform pond closure, repurposing, and maintenance activities at this coal-fired power plant located along a major river system in the Midwest. Based on the successful completion of the East Bottom Ash Pond Closure, ENTACT was awarded additional work at the facility, as outlined below, on a competitive or sole-sourced basis. Highlighted projects include: East Bottom Ash Pond Closure The EBAP was closed in compliance with CCR Rule 40 CFR Part 257 and Effluent Limit Guidelines 40
FORMER MINE SITE PROCESS AREA RADIOLOGICAL REMEDIATION
ENTACT was engaged to perform comprehensive radiological remediation at a former copper mine site in the Rocky Mountains. This project involved the removal of radiologically impacted soil, asbestos pipe, and the capping of tailings in former evaporation ponds. All actions were executed in compliance with an EPA Administrative Order on Consent, ahead of schedule, and with a strong emphasis on worker health and safety, which impressed the EPA. The project included the following key activities: Evaporation Pond Closures To facilitate
FORMER MGP SITE IN-SITU SOLIDIFICATION AND STABILIZATION
ENTACT completed site remedial work and in-situ solidification and stabilization (ISS) of impacted soils at an eight-acre former manufactured gas plant (MGP) site. The project was located near industrial, commercial, and residential properties, as well as community parking areas, a recreational park, and water district facilities, including water supply wells. This comprehensive remediation approach ensured the effective treatment of impacted soils while safeguarding surrounding properties and community resources. On this project, ENTACT: Excavated, transported, and disposed of 52,000 tons of
FORMER WOOD TREATING SITE CORRECTIVE MEASURES
ENTACT implemented corrective measures at a 52-acre former wood-treating facility that produced creosote-treated railroad crossties. This comprehensive remediation project aimed to contain contamination and restore the site for future use. For this project, ENTACT: Installed a 2,200 linear foot soil-bentonite slurry wall to a depth of 45 feet below surface grade to contain the source area and control groundwater migration Excavated and consolidated 17,000 cubic yards of polycyclic aromatic hydrocarbon and phenol-impacted surface soils, subsurface soils, and sediments Dewatered and
ACTIVE REFINERY EXPANSION RCRA CORRECTIVE ACTION
ENTACT performed remediation activities at a Gulf Coast refinery as part of a Resource Conservation and Recovery Act (RCRA) Corrective Action to address solidified F037 waste and oily sediments in preparation for constructing a new ethane cracker unit. Scope of work completed by ENTACT: Demolished and removed at-grade and below-grade structures Removed existing cover materials for segregation, stockpiling, and/or reuse as road or laydown area material or backfill at other areas of the refinery Dewatered existing water and managed water