Geotechnical Construction

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

LNG EXPORT TERMINAL GROUND IMPROVEMENT

ENTACT performed soil improvement activities at a 1,000-acre site in preparation for the development of a liquefied natural gas (LNG) export terminal. The project site is strategically located on a ship channel with direct access to the Gulf of Mexico, offering deep-water access, proximity to abundant gas supplies, and ease of transport for buyers. ENTACT successfully completed the work within a three-month timeframe, ensuring the site was prepared for further development. Our team: Improved 410,000 cubic yards of soft saturated

LNG LIQUEFACTION SOIL STABILIZATION

The Client’s project involved the expansion of a liquefied natural gas (LNG) terminal to accommodate three LNG trains, a gas pretreatment unit, and a dock. Prior to construction, the ground required reinforcement to support the complete turnkey LNG facility. ENTACT completed the project in 11 months, finishing ahead of schedule and within budget. Upon project completion, ENTACT had: Stabilized more than two million cubic yards of soft dredged sediment and fill soils Performed in-situ stabilization on timber mats and pneumatic

LNG EXPORT FACILITY SOIL IMPROVEMENT

In preparation for future construction at this liquefied natural gas (LNG) export facility, ENTACT improved the soil in the expansion area to facilitate equipment access and support the construction of perimeter storm protection and a levee system. ENTACT completed the ground improvement work within 10 months. For this project, ENTACT: Improved nearly two million cubic yards of soft saturated dredged clay Utilized Type I-II Portland cement to achieve a shear strength of 1,800 psf for the site raise area and

AGGREGATE MINER AND SUPPLIER SLURRY WALL PROGRAM

ENTACT initially served this major aggregate miner and supplier by replacing a cutoff wall more than 9,000 feet high. This successful project established ENTACT as the Client’s dedicated slurry wall contractor. Building on that relationship, we constructed a bentonite slurry wall to minimize dewatering efforts and facilitate dry mining operations. This collaborative effort ensured minimal disruption to mining operations while effectively managing groundwater. On this project, ENTACT: Constructed a 7,438-foot-long, 30-inch-wide soil-bentonite slurry wall Identified and protected subsurface utility lines

TAR PONDS AND COKE OVENS SITE SOLIDIFICATION AND STABILIZATION

The tar ponds at this site were filled with waste from a steel mill and coke oven, which significantly impacted the nearby tidal estuary with contaminated sediments and sludge. In response, the governments of Canada and Nova Scotia initiated a cleanup plan to remediate the site and create Open Hearth Park, a community gathering space. ENTACT played a pivotal role in this project by developing solidification and stabilization mix designs in our treatability lab and validating the recommended formula through

INTEGRATED ENERGY COMPANY KEY SUPPLIER PROGRAM

ENTACT has been a trusted partner for a major integrated energy company, performing remedial construction, geotechnical construction, and civil construction activities throughout the U.S. and select international locations for more than 20 years. This longstanding relationship underscores our commitment to collaboration and excellence. We work closely with the Client’s team during the planning phase, assisting with preliminary design evaluations, site engineering, remedy selection, and cost budgeting for various projects. Our services focus on delivering safe, effective, and cost-sensitive solutions at

INDUSTRIAL COMPLEX REMEDIATION AND REDEVELOPMENT

ENTACT performed comprehensive remedial activities at a 2,200-acre industrial complex to prepare the site for mixed-use redevelopment. Leveraging our internal technical and treatability expertise, we developed a remediation solution aimed at reducing the site’s high moisture levels to meet specific objectives. This involved geotechnical evaluations, soil mixing, free draining, dewatering, and reagent assessments of source materials. To maintain an efficient schedule, we executed critical activities concurrently throughout our phased, multiyear approach. Upon project completion, ENTACT had: Removed 3.9 million cubic

ACTIVE REFINERY PROCESS UNIT PROPOSED LOCATION

ENTACT performed soil remediation and ground improvement efforts to address low-pH soils resulting from a sulfuric acid spill at the refinery. Stabilization of the ground was essential to support the construction of a new process unit at the site. These remediation efforts were crucial for ensuring the structural integrity needed for the upcoming development at the refinery. On this project, ENTACT: Performed in-situ solidification on 86,000 cubic yards of material Enhanced soil strength using a blend of granulated ground blast

BROWNFIELD REDEVELOPMENT AREA REMEDIATION

ENTACT performed remediation activities across several blocks and lots as part of a larger brownfield redevelopment project aimed at future residential use. The site was impacted by multiple industrial operations, leading to soil contamination with various hazardous substances, including polycyclic aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs), polychlorinated biphenyls (PCBs), hexavalent chromium, chromium ore process residue (COPR), extractable petroleum hydrocarbons (EPH), pesticides, metals, and lead. For this project, ENTACT: Designed, procured, and installed a 1,600-linear-foot, 40-foot-deep permanent vertical hydraulic control

ACTIVE REFINERY TANK FOOTPRINT SUBSURFACE GROUND IMPROVEMENT

As part of a larger capital program, an active refinery aimed to expand its footprint for 14 tanks and four pump pads. Before construction could begin, ENTACT performed subsurface soil treatment to address soft saturated soils, reducing potential settlement of the new structures. This comprehensive ground improvement approach ensured the structural integrity of the new tank foundations and pump pads, meeting project objectives and performance criteria. On this project, ENTACT: Installed a series of eight-foot diameter soil-cement columns on a