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
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
FORMER MANUAFACTURED GAS PLANT (MGP) SITE REMEDIAL ACTION
ENTACT undertook the remediation of a former MGP site situated in an urban area, adjacent to light industrial and commercial developments, as well as undeveloped land and a shallow river. Historical releases of MGP residuals had contaminated soil and groundwater, leading to the migration of pollutants to the riverbank, affecting an isolated sediment area. During the project, ENTACT: Developed a treatability study Demolished concrete footings and slabs Excavated and disposed of 10,500 tons of impacted soil off-site Installed180 linear feet
FISHING CREEK SOUTH JETTY REHAB AND MAINTENANCE DREDGING
This project was performed by White Lake Dock & Dredge, a division of ENTACT. Scope of work involved both dredging and stone jetty improvements for the U.S. Army Corps of Engineers. All work was conducted in a shallow tidal environment, ensuring compliance with environmental standards. Throughout this project, our team: Dredged more than 30,000 cubic yards of sediment from inner and outer harbors and conveyed it to a confined disposal facility (CDF) Graded and replaced weir box outlet control structures
SANITARY LANDFILL NPL SITE
ENTACT was engaged to perform remediation services at a former sanitary landfill National Priorities List site spanning approximately two acres. The project required the removal of 23,800 cubic yards of impacted soil and the disposal of over 35,000 buried drums that had been discarded at the site in the early 1970s. On this project, ENTACT: Constructed a 200-foot by 350-foot container management area pad Designed and installed a steel sheet pile wall to protect an existing soil-cement-bentonite slurry wall Constructed
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
RARE EARTH PROCESSING FACILITY RADIOLOGICAL DECOMMISSIONING
ENTACT decommissioned, decontaminated, and demolished a former rare earth minerals processing plant within a larger chemical manufacturing complex. The site received USEPA closure approval in 2015. Through modeling, remediation goals were established for allowable soil concentrations, achieving regulatory compliance with limits of 3 pCi/g for thorium-232 and 9 pCi/g for uranium-238. 100,000 tons of radiologically impacted soil, sediment, and construction debris and 230,000 gallons of impacted water were removed from the facility using rail, truck, and tanker transport. Waste was
FORMER SMELTER MIXED-USE REDEVELOPMENT
ENTACT executed comprehensive remedial action activities at a former smelter site, focusing on managing and consolidating onsite debris, as well as decontaminating and demolishing the remaining smelter buildings. On this project, ENTACT: Regraded more than 1.3 million cubic yards of slag and soil, including slag piles as large as eight acres and up to 50 feet tall Distinguished five separate slag categories by color and gradation for targeted utilization in various sections of the development Removed impacted soil and sediment
CANAL SEGMENT CONTAMINATED SEDIMENT REMEDIATION
ENTACT executed the remediation of mercury and lead contaminated sediments along a 3,600-linear-foot segment of a closed canal. This project involved the construction of a temporary remediation support area and several key operational components to ensure effective sediment removal and management. Our team successfully addressed sediment contamination and enhanced the ecological and recreational value of the canal area. On this project, ENTACT: Constructed a temporary remediation support area with two dredge processing cells, a temporary water pretreatment system area, multiple
FORMER OILFIELD AND SERVICE FACILITY EXCAVATION AND BACKFILL SERVICES
ENTACT conducted remediation activities at a former oilfield and service facility to address soils impacted by volatile organic compounds (VOCs), nonaqueous phase liquids (NAPL), and BTEX (benzene, toluene, ethylbenzene, and xylene). This project effectively remediated the contaminated site, preparing it for potential future use. On this project, ENTACT: Excavated 3,268 cubic yards of impacted soils Performed self-hardening cement-bentonite slurry-supported excavation of 13,000 cubic yards of impacted soils Transported and disposed of 25,500 tons of excavated material off-site Backfilled affected areas