At the Bayou Verdine site in Calcasieu Estuary, West Lake, Louisiana, decades of contaminants from heavy industry, refinery operations, and stormwater runoff built up in the sediments and surface water. EPA identified high levels of metals and hazardous chemicals at the site and began cleanup in 2012. The cleanup included removing contaminated sediments and restoring parts of the bayou shoreline. It also included actions to improve the ecological function of the area. Removal of sediments from a pond created an open-water riparian habitat. EPA and its partners connected the pond to the wetland environment of Bayou Verdine through a drainage bioswale designed to reduce erosion and provide more wildlife and fish habitat. Parties also seeded areas with native wildflowers to create a pollinator habitat.

The 35-acre Nyanza Chemical Waste Dump Superfund site in Ashland, Massachusetts, formerly housed operations that manufactured textile dyes, dye intermediates and other related products from 1917 to 1978. Operations buried solid waste on-site and released manufacturing wastewater onto on-site lagoons. This contaminated soil, sediment and groundwater with mercury and volatile organic compounds such as trichlorethylene. EPA began cleanup at the site in the 1980s. EPA excavated sludge and contaminated soils and sediment, capped the landfill, installed vapor mitigation systems in buildings and installed groundwater extraction wells. From 1999 to 2001, EPA worked to restore affected wetlands on site, including the 5.5-acre Eastern Wetland. EPA dug up mercury-contaminated sediments and monitored fish tissue for mercury in the Sudbury River.

The 1,250-acre Ciba-Geigy Corp. Superfund site in Toms River, New Jersey, is a former resin and dye manufacturing facility. Improper chemical waste disposal contaminated soil and groundwater at the site. EPA's cleanup actions included excavation and off-site disposal of contaminated material, treatment of contaminated soil, installation of caps and slurry walls to prevent contamination migration, installation of a groundwater extraction, treatment and recharge system, and institutional controls. In 2009, BASF acquired the site property from Ciba-Geigy. BASF partnered with high school environmental classes to conduct wildlife surveys on the site. The company hosts tours that teach students about the site's history, contamination and cleanup, as well as wildlife species on site. During redevelopment of the site, paved areas were replaced with wildflowers and vegetation to enhance local habitat for the threatened Grasshopper Sparrow and Northern Pine Snake.

The Lower Darby Creek Area Superfund site along Darby and Cobbs Creeks in Pennsylvania includes two landfills that were active from the 1950s to 1970s. The landfills accepted municipal, demolition and hospital wastes. The landfills likely affected creeks and wetlands through surface erosion, runoff and seeps, contributing to site contamination. EPA's cleanup of the site involved excavation and disposal of contaminated waste and cleanup and remediation of residential yards. Cleanup actions also included using natural features to reinforce the shoreline, providing improved habitat along the streambank. The cleanup included 16 acres of municipal park and open space and over 4,000 feet of streambank. Cleanup is ongoing at the John Heinz National Wildlife Refuge, a 1000-acre national wildlife refuge managed by the U.S. Fish and Wildlife Service.

The Croydon TCE Superfund site covers 3.5 square miles between the townships of Croydon and Bristol in Pennsylvania. In 1985, EPA found contamination at the site after an investigation at a neighboring industrial plant discovered groundwater contamination. Contaminants like trichloroethylene were detected in the groundwater and surface water. No source of the contamination was found. EPA began cleanup of the site in 1987, which included installing a groundwater treatment system and connecting homes impacted by the groundwater contamination to the public water supply. Cleanup is ongoing at the site. In 2016, the Heritage Conversancy gained ownership of the site and three years later opened the Croydon Woods Nature Preserve on the site, one of the last remaining coastal plain forests in the state. In 2019, EPA presented the Heritage Conservancy with its Excellence in Site Reuse Award for outstanding work in the reuse that turned a formerly contaminated forest into a nature preserve.

Between 1957 and 1974, the Chisman Creek site was used as a coal ash dumping ground by the nearby Yorktown Power Station. The ash was left over from burning coal and petroleum coke to produce electricity. About 500,000 tons of ash were deposited at the site before the power plant was converted to burn fuel oil in 1974. In the early 1980s, state agencies investigated the site and found heavy metals in groundwater and surface water. In response, EPA placed the site on the National Priorities List in 1983. Assessment and remediation work began soon thereafter. Before the Chisman Creek Superfund site was cleaned up, it was unusable land that provided no benefits to the local community. Thanks to the leadership of the responsible party and the York County, Virginia government, the site became the first Superfund site in the nation to be redeveloped after cleanup. Today, the site has been transformed into two jewels of the York County, Virginia, park system. This case study tells the story of one of the first Superfund sites in the country, and how its pioneering redevelopment continues to be an example of success 25 years later.

Established in December 1941 to produce TNT for World War II, the Longhorn Army Ammunition Plant facility was a major employer in east Texas. Over time, the facility produced a variety of munitions, including incendiary devices and rocket motors. Facility operations and chemical releases resulted in the contamination of soil and groundwater with volatile organic compounds, perchlorate, metals and explosives. EPA, along with the U.S. Army and the Texas Commission for Environmental Quality, began cleanup of the site in 1991. As the cleanups progressed, the Army began transferring land to the U.S. Fish and Wildlife Service (FWS) for stewardship and management. To date, over 7,000 acres have been transferred and transformed into the Caddo Lake National Wildlife Refuge, where forest, wetland and aquatic habitats support hundreds of species of wildlife and visitors enjoy various outdoor activities. This case study provides information and lessons learned for parties interested in Superfund site reuse, habitat conservation, and the adaptation of former federal facility and military sites for public use.

In December 2008, a dike containing about 20 million cubic yards of coal ash from power plant operations failed and released over 5 million cubic yards of coal ash into the Emory River and adjacent land. The spill had significant effects on the community and environment. Aquatic organisms and shorelines were buried in coal ash. Cleanup was needed to ensure the protection of human health and the environment. The cleanup process considered ecological revitalization of the site and surrounding area as an integral part of all response activities. A team of biologists, landscape architects, and engineers worked together to integrate plantings and ecological aspects as components of the cleanup activities. An ecosystem was created by planting a mosaic of forested, scrub-shrub, and emergent wetland plant communities, as well as native trees and seeds in disturbed areas. Today, there are frequent bird sightings at the site, including white ibises, cattle egret, and herons.

Contamination from nearly 100 years of copper smelter operations affected the health and quality of the environment at the Ancaconda Smelter Site. Estimates indicate that more than a billion gallons of groundwater were contaminated and thousands of acres of soil were affected by fluvially transported mine wastes and smelter emissions. The massive 300-square-mile site area and variable, rugged terrain provided major remedial design challenges. The innovative site evaluation and assessment techniques, paired with effective remedial processes such as tilling and adding soil amendments, have helped restore these vital grasslands and ranch areas. The uplands remediation and ecological revitalization efforts have served to provide key lessons and replicable assessment techniques for other sites with area-wide contamination.

Over 80 years of zinc smelting operations at the Palmerton Zinc Superfund Site left surface soils, shallow groundwater, and stream sediments contaminated with heavy metals. Large quantities of zinc, lead, cadmium, and sulfur dioxide emitted by two former zinc smelters from the late 1800s to 1980 damaged vegetation and defoliated over 2,000 acres of land. With no plants to keep the soil in place, erosion of contaminated soil impacted the nearby Lehigh River and Aquashicola Creek. To stabilize the contaminated soil, the site was revegetated using a variety of ecological revitalization techniques that evolved over time and took into consideration up-to-date technologies. Revegetation has stabilized the treated area, reduced soil erosion, and improved water quality associated with runoff from the site. A 450-acre portion of the site is now filled with warm-season grasses and is the home of the Lehigh Gap Nature Center, where both wildlife and the public are able to enjoy the lush open space.

This is the story of the transformation of a former chemical manufacturing site into thriving wetland, prairie, and woodland habitat. The closure of Occidental Chemical Corporation (Oxy) facility in Montague, Michigan in 1983 left behind soil and ground water contaminated with chlorinated organic chemicals. Habitat preservation is an Oxy corporate principle so after meeting the EPA cleanup standards they also provided an ecological asset for the community. The surrounding countryside is a mix of hardwood forests, pine plantations, dunes and grasslands, homes, summer cottages, beaches and towns, in the Lake Michigan basin. Rather than leave a brownfield in its wake, a few individuals at Oxy spearheaded the transformation of the former chemical manufacturing site into a thriving prairie, savannah, woodland, and wetland habitat. The restoration plans included amending soils, creating wetlands, and planting native grasses, shrubs, and trees as well as long-term stewardship activities and the creation of recreational opportunities.

The Army Creek Landfill site is a 47 acre abandoned sand and gravel quarry that was used as a municipal and industrial waste landfill for over nine years. The soil and groundwater were contaminated with chromium, mercury, and volatile organic compounds. Remediation activities at the site included a multi-layer protective cover and a groundwater treatment system. In addition, native vegetation was planted to create a bird and wildlife habitat, and wetlands were created to help prevent flooding and create additional habitat.

While once fertile farm land, a 6,000 hectare area was strip mined for its coal. The mine spoils consisted primarily of unconsolidated overburden soils and consolidated materials such as shale or sandstone bedrock. In 1972 the WRD divided the land into two large parcels according to spoil type plus control areas. At first liquid biosolids (4% solids) were applied directly to the mine spoils. Later the solids content was increased to 60 to 70%. Over time the net carbon (C) sequestration in the soil increased to 1.73 (0.54-3.05) Mg C ha^-1 yr^-1 in biosolids-amended fields as compared with -0.07 to 0.17 Mg C ha^-1 yr^-1 in fertilizer controls. The area has been returned to fertile agricultural land and is classified as a C-sink soil as opposed the normal Midwest Corn Belt soils' C-neutral classification.

Past disposal practices at the Joint Expeditionary Base (JEB) Little Creek - Fort Story site along the Chesapeake Bay area in Virginia Beach, Virginia, left a tidal wetlands area filled with debris, contaminated soil, and sediment. After waste materials were excavated, the landfill was converted to a tidal wetland. Two connecting channels were constructed to allow tidal inundation of the site from Little Creek Cove. Plants were selected and planted along designated elevations to establish native tidal wetland vegetation for habitat, using the neighboring marsh as a reference wetland.

The hillsides within the Bunker Hill Box non-populated areas (OU2) are returning to a coniferous forest ecosystem. The transformation is the result of efforts to reduce pollution of the South Fork of the Coeur d'Alene River by controlling erosion and increasing soil development. Adaptive management during the cleanup and ecological revitalization process allowed for flexible decision-making.

At the site's OU3 about 25 miles west of OU2 and downstream along the Coeur d'Alene River, a private, contaminated agricultural property was converted to healthy wetland habitat. Lead-contaminated soil and sediment throughout the lower river floodplains adversely affected wildlife. EPA's 2002 Superfund cleanup plan called for remediation of soil, sediment and water contaminated with toxic levels of heavy metals to create habitats capable of supporting a functional ecosystem and prevent ingestion and dermal contact by ecological receptors. Settlement money funded EPA's remedial action, which established nearly 400 acres of clean waterfowl feeding habitat. Additional restoration work by the Natural Resource Trustees followed. Use of buckwheat and other native herbaceous plants helped create an attractive habitat for wildlife and pollinators. Monitoring by the U.S. Fish and Wildlife Service shows that the remediated and restored habitat attracts some of the highest levels of waterfowl usage, waterfowl feeding and waterfowl diversity in the Coeur d'Alene River Basin. Blood lead data suggest that waterfowl using the conservation easement are experiencing reduced exposures to lead. This project is the first of its kind in the Coeur d'Alene River Basin, and is an important step in addressing serious ecological contamination issues in the basin.