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
PICKLE POND REMEDIATION AND HABITAT CONSTRUCTION
ENTACT performed remedial activities at Pickle Pond, a nine-acre urban pond situated in the St. Louis River lower estuary. This project aimed to enhance the habitat for local wildlife, including waterfowl, beavers, and otters, while addressing sediment contamination. During this project, our team: Dredged more than 16,000 cubic yards of contaminated sediments composed of fine-grained silty clays Solidified dredged materials by applying a non-toxic super absorbent polymer to reduce excess water, allowing for direct loading into trucks for offsite disposal
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
ENTACT performed soil improvement and design-construct earth retention services in support of the expansion of a liquefied natural gas (LNG) terminal on the Gulf Coast. The facility, originally constructed as an import terminal, is being upgraded to include liquefaction and export capabilities. In preparation for this expansion, ENTACT improved subsurface conditions to facilitate equipment access and support construction of the perimeter storm protection levee system. The project required large-scale soil stabilization of 2,040,000 cubic yards of dredged fill material. This work
FORMER CHROMIUM ALLOY AND RADIOLOGICAL SUPERFUND SITE
ENTACT executed a four-phased remedial action project to support the decommissioning of a former glass and super alloy additives manufacturing facility. The site, due to historical metallurgical operations, exhibited metals and radiological contamination in soil and sediment both on-site and in adjacent areas, including wetlands, a stream channel, and wooded uplands. The project phases were designed to systematically address the impacted materials, as outlined below: Phases 1 and 2 Remediation The initial phases focused on materials within the property limits.
CHEMICAL AND RADIOLOGICAL REMEDIATION
ENTACT is leading an extensive ecological restoration of more than 100 acres at a former industrial site that hosts several chemical manufacturers, a clay mining operation, and a disposal area for impacted soils and dredge spoils. The restoration plan aims to create a 14-acre open-water pond, 40 acres of wetland mitigation, 55 acres of upland enhancement, and nearly two miles of public walking trails and boardwalks. The project comprises multiple phases, detailed below: Sediment Remediation Phase This phase focused on
ACTIVE STEEL MILL CREEK AND DITCH PCB-IMPACTED SEDIMENT REMOVAL
ENTACT partnered with our Client to implement a phased solution for the removal of PCB-impacted sediment and the restoration of the surrounding river and its environment for the benefit of the nearby community. The project involved comprehensive remediation efforts across 3,000 linear feet of ditch line and 5,600 linear feet of creek channel. ENTACT performed the following scope activities: Transported 178,500 tons of PCB-impacted sediment, clay, and native materials off-site for disposal Treated and filtered four billion gallons of water
FORMER PHOSPHATE FERTILIZER SITES REMOVAL ACTION
ENTACT executed comprehensive remediation efforts across nine former phosphate fertilizer production and manufacturing sites to address lead- and arsenic-impacted soils, sediments, and groundwater. Partnering closely with our Client, ENTACT navigated the complexities and regulatory requirements of this multifaceted remediation project. The sites were in commercial, residential, and industrial zones, with tidally influenced areas adjacent to navigable waterways, marshes, uplands, active rail lines, and major highways. While the scope varied across the sites, the typical activities included: Excavation and off-site disposal
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
WET FLY ASH IMPOUNDMENT CLOSURE
ENTACT successfully completed the closure of a 140-acre wet fly ash impoundment containing 13.4 million cubic yards of coal combustion residual (CCR). The project involved a comprehensive approach to manage surface water by pumping and utilizing temporary drainage channels in the deposited ash, directing it to a permitted outfall located behind the main dam. Notable scope items on this project completed by ENTACT: Lowered the main dam and removed the saddle dam Constructed a new spillway for both dams to