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 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
PCB SITE RESIDENTIAL REMEDIATION AND RESTORATION
ENTACT undertook a multiyear remediation and restoration project at an active industrial facility, addressing the presence of polychlorinated biphenyls (PCBs) in the surrounding area, which posed risks to nearby residential and community spaces. Utilizing our expertise in residential remediation, ENTACT developed a comprehensive field approach that prioritized community safety, maintained clear communication with impacted neighbors, and adhered to an efficient schedule. Upon project completion, ENTACT had: Remediated and restored 676 PCB-impacted residential properties Transported and placed removed soils to either
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
FORMER MGP SITE
ENTACT implemented in-situ solidification and stabilization at this former manufactured gas plant (MGP) to address impacted materials and prepare the site for redevelopment. Through two phases of work, we effectively managed environmental conditions while meeting our Client’s schedule and budget objectives. Upon project completion, ENTACT had: Demolished and removed existing structures, with off-site disposal and recycling of building slabs and subsurface materials Collected, managed, treated, and discharged MGP contact water Removed, reinstalled, or protected utilities and plugged and grouted abandoned
FORMER FACTORY REMEDIATION AND REDEVELOPMENT
ENTACT successfully remediated a former factory site designated for residential and retail redevelopment, addressing contamination from multiple sources, including arsenic and lead. The property is situated in a dense urban area, divided by a city street and bordered by city transit and right-of-ways (ROWs). Upon project completion ENTACT had: Treated and disposed of 44,000 tons of non-hazardous material Stabilized and disposed of arsenic, volatile organic compound, and contaminant-impacted soils Excavated and disposed of chromium-impacted hot spot areas Utilized benching and
FORMER WASTE OIL RECOVERY FACILITY NATIONAL PRIORITIES LIST (NPL) SITE
ENTACT was engaged to perform remediation and geotechnical construction services at this NPL Superfund site, addressing contaminants across 150 acres formerly occupied by a waste oil recovery facility. The site featured numerous aboveground storage tanks, two API separators, a large, elevated sludge impoundment, and a small cemetery, bordered by a bay, a closed waste disposal site, a city landfill, and undeveloped marsh and wetlands. To optimize the project timeline, ENTACT implemented a phased approach that allowed construction to proceed concurrently
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
FLY ASH IMPOUNDMENT CLOSURE AND DAM MODIFICATION
ENTACT undertook a multiyear phased approach for the closure of a 300-acre wet fly ash impoundment. The project commenced with the drainage of surface water, utilizing pumping and temporary drainage channels to direct water to an area behind the main dam. As surface water was managed, we excavated the exposed fly ash and relocated or regraded the surface to achieve the required subgrade elevations across the site. This careful and coordinated approach ensured effective stormwater management and successful project completion.
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
FORMER WOOD PRESERVING SITE REMEDIAL ACTION
ENTACT was engaged to remediate an 84-acre wood preserving site added to the National Priorities List in 1997 due to contaminated groundwater, soil, and sediment resulting from more than 30 years of wood treating operations. Previous cleanup phases had been insufficient, leading to the selection of in-situ solidification (ISS) as the revised remedy. On this project, ENTACT: Conducted an ISS demonstration prior to full-scale implementation Removed, stockpiled, and replaced clean overburden soils Executed ISS on 15,400 cubic yards of non-aqueous
COKE AND GAS SITE UPLANDS REMOVAL ACTION
ENTACT conducted a non-time-critical removal action at the 45-acre uplands area of a former coke and gas site to prepare for commercial redevelopment. This project involved multiple phases to ensure effective remediation and site readiness. Upon project completion, ENTACT had: Demolished and removed of 38,000 cubic yards of surface and subsurface structures Resized, crushed, and screened 53,000 cubic yards of stockpiled debris for reuse onsite Removed 3,900 wooden pilings Excavated 30,000 cubic yards of non-affected overburden soil for onsite stockpiling