Jump to main content or area navigation.

Contact Us

Superfund


   

Sites in Reuse in Delaware

Army Creek Landfill Green Infrastructure
Site photo

The 50-acre Army Creek Landfill site is located in New Castle, Delaware. A vibrant wildlife area has replaced a municipal and industrial waste landfill that operated from 1960 to 1968. Filled to capacity with 2 million cubic yards of municipal refuse, the landfill contaminated soil, ground water, nearby Army Creek, and local water supply wells. After discovering the contamination in 1983, EPA added the site to the National Priorities List (NPL). Under EPA oversight, the site’s potentially responsible parties (PRPs) conducted cleanup activities, including the removal and off-site disposal of over 100 buried drums containing chemical wastes, construction of a multi-layer cap over the site, and installation of a water treatment facility. The PRPs completed construction activities for the cleanup in 1994. The water treatment facility treated an estimated 500,000 to 900,000 gallons of contaminated ground water per day until 2004, when ground water recovery operations at the site were discontinued. Collaboration among EPA, local natural resource trustees, the United States Fish and Wildlife Service, and the Delaware Division of Fish and Wildlife led to the incorporation of a wildlife area into the design of the site’s multi-layer cap. Various grasses and vegetation planted at the site encourage migratory birds to feed on the land. Development of the wildlife area included the installation of bird boxes along the riparian wetlands of Army Creek to encourage nesting. Gooseberry planted around the landfill’s gas vents provides visual cover and a food source. EPA addressed flood problems in low-lying areas by modifying the slope and location of discharge pipes from the treatment facility sediment basins to create standing wetlands. The wetlands prevent erosion and surface water runoff and provide habitat for numerous species of plants and animals.
Updated 2/2013

For more information:

Delaware Sand & Gravel

The 27-acre Delaware Sand & Gravel Landfill site in New Castle, Delaware, demonstrates industrial reuse of a former landfill. Between 1968 and 1976, the landfill on site accepted municipal and industrial wastes, including drums containing organic and inorganic chemicals. Leachate from the landfill area contaminated ground water. In 1983, EPA added the site to the National Priorities List (NPL). Cleanup at the site included the removal of waste drums, capping of waste disposal areas, bio-venting of contaminated soil, and pumping and treating of contaminated ground water. Capping took place on a 16-acre portion of the site. EPA worked with the site owner to construct a special "wear-surface" cap over a 5-acre portion of the landfill in order to support reuse of the landfill area. The "wear surface" cap supports daily use as a storage area for heavy equipment. This area of the site operates as a storage area for impounded vehicles, propane tanks and salvage materials. The owner of the site property also maintains a private residence on site.
Updated 2/2013

For more information:

Delaware City PVC Plant
Site location map

The Delaware City PVC Plant site is located in New Castle County, Delaware. Formosa Plastics Corporation of Delaware owns and operates the facility, which was originally built in 1966 by Stauffer Chemical Company. A polyvinyl chloride (PVC) manufacturing facility continues to operate at the 200-acre site. Operators of the manufacturing facility dumped PVC waste in earthen lagoons during early plant operations. Site operators used another area of the property to bury off-grade PVC sludge. Waste disposal practices have resulted in the contamination of ground water under the site. Local residents, businesses and farms use ground water for drinking water and other purposes. EPA placed the site on the National Priorities List (NPL) in 1983. Site cleanup included pumping and treating contaminated ground water, excavating off-grade materials and contaminated soil for off-site disposal, and properly capping the buried sludge pits. The ground water treatment system began operating in 1991 and the size of the original ground water contaminant plume has steadily decreased over time. Discovery of a second ground water contamination plume required the installation of additional extraction wells and piping in 2001. Additional cleanup activities include connection to the public water supply for businesses and residences near the western portion of the site impacted by well contamination. The PVC manufacturing facility continues to operate on the site.
Updated 2/2013

For more information:

Dover Gas Light Company
Site photo

From 1859 until 1948, the Dover Gas Light Company in Dover, Delaware, processed coal to produce gas for use in street lamps in Dover. Site operators buried process materials containing coal tar residues at the 23-acre Dover Gas Light Co. site, contaminating soil and ground water. In 1989, EPA placed the site on the National Priorities List (NPL). The site’s potentially responsible parties (PRPs) have conducted cleanup activities under the oversight of EPA and the Delaware Department of Natural Resources and Environmental Control since 1989. These activities include removing and treating contaminated soil, treating contaminated ground water and constructing a cap over the site. Today, the cap over the 1-acre site serves as a paved parking lot for the adjacent Victrola Museum. EPA began conducting additional ground water investigations at the site in 2005, which are currently ongoing.
Updated 2/2013

For more information:

E.I. DuPont De Nemours & Co., Inc. Alternative Energy Green Infrastructure
Site photo

The E.I. DuPont De Nemours & Co., Inc. (Newport Pigment Plant Landfill) site in Newport, Delaware, contains two industrial landfills: the 7-acre north landfill and the 15-acre south landfill. From 1902 to 1929, the plant manufactured Lithopone, a white, zinc- and barium-based pigment. In 1929, DuPont bought the plant and phased out production of Lithopone in favor of other pigments and dyes. DuPont also began production of other products on the site, including chromium dioxide. Site operators disposed of metal-laden wastes in the on-site landfills. These activities contaminated ground water and soil, as well as adjacent wetlands and the Christina River. In 1990, EPA added the site to the National Priorities List (NPL). EPA selected a cleanup plan, which addressed site contamination while also allowing the plant to remain in operation. DuPont conducted cleanup activities under the oversight of EPA and Delaware’s Department of Natural Resources and Environmental Control. These activities included the removal of contaminated soil and sediment, as well as installation of a municipal water line for nearby residents affected by contaminated ground water. DuPont completed cleanup in 2002; however, operation and maintenance activities continue. Today, restored wetlands provide valuable ecological habitat at the site and much of the property is in reuse or continued use. The BASF Corporation, formerly Ciba-Geigy, owns the pigment plant and continues to operate as a pigment manufacturing facility. The company employs approximately 600 workers. DuPont continues to operate the chromium dioxide manufacturing facility on the site. The state purchased part of the south landfill for use in a highway construction project. In addition, Tangent Energy worked with DuPont and Greenwood Energy to redevelop a portion of the site as a solar farm. DuPont hosted a ceremony in December 2013 to celebrate the start of operations at the 5-acre solar installation. The 548-kilowatt solar farm generates about 729,000 kilowatt hours of energy each year, which is enough to power 60 homes. The solar farm reduces Newport’s greenhouse gas emissions by 350 tons per year.
Updated 4/2014

For more information:

Halby Chemical Co.
Site photo

The Halby Chemical Co. site includes nine acres located in an industrial area of the Port of Wilmington in New Castle, Delaware. From 1948 until 1980, a chemical manufacturing plant operated on the southernmost three acres of the site. Site operators discharged wastewater from the plant into an unlined lagoon. Wastewater containing chemicals then flowed through an adjacent tidal marsh, through the Lobdell Canal, and into the Christina River. The wastewater discharges resulted in the contamination of sediments. Some contaminants seeped directly into the ground water. In 1986, EPA placed the site on the National Priorities List (NPL). Site cleanup activities included treating approximately 11,000 cubic yards of contaminated soil on site and placing all contaminated soil and sediment remaining on site under protective covers. Although monitoring activities on site are ongoing, three office buildings/warehouses housing at least five small businesses continue to operate at the site.
Updated 2/2013

For more information:

Harvey & Knott Drum, Inc.

The 20-acre Harvey & Knott Drum, Inc. site is located in Kirkwood, Delaware. From 1963 to 1969, Harvey & Knott Drum, Inc. operated an open dump and burning area on a portion of the site. The facility accepted sanitary, municipal and industrial wastes, including sludge, paint pigments and solvents. Site operators dumped wastes onto the ground or into excavated trenches, left waste in drums, or buried waste at the site. These activities resulted in the contamination of ground water, surface water, soil and sediment. EPA placed the site on the National Priorities List (NPL) in 1983. The site’s potentially responsible parties (PRPs) conducted cleanup activities under EPA oversight. These activities included draining water from the on-site pond, removing and disposing drums at an off-site facility, excavating contaminated soil and sediment, capping remaining contaminated soils and installing a ground water and surface water monitoring system. Ground water monitoring and maintenance of the monitoring system and cap continue at the site. Currently, the site supports recreational purposes as a paintball game facility.
Updated 2/2013

For more information:

NCR Corp. (Millsboro Plant)

The 140-acre NCR Corp. (Millsboro Plant) Superfund site is located in Millsboro, Delaware. Cleanup and reuse of this site demonstrates how cooperation among EPA, the state, private parties and the community can transform a once heavily-contaminated property into an area of productive use. From 1967 to 1980, National Cash Register (NCR) made cash registers and other electronic devices on a portion of the site. Site operators stored solvents used in degreasing operations in a tank outside the manufacturing building. Plating operations discharged wastes into on-site concrete lagoons for sedimentation and clarification. Site operators disposed of sludge that accumulated in the lagoons in a pit on site. In the early 1980s, First Omni Bank purchased a portion of the site and built a bank. From 1981 to 1983, under state oversight, NCR conducted site investigations, which revealed ground water contamination. In 1987, EPA placed the site on the National Priorities List (NPL). A ground water pump and treat system has operated at the site since 1988. First Omni Bank continued operation at the site during the cleanup process. Currently, First Omni Bank, now M&T Bank, continues operations at the site.
Updated 2/2013

For more information:

New Castle Spill
Site photo

The 6-acre New Castle Spill Superfund site is located in New Castle, Delaware. Witco Chemical Company (Witco), a producer of materials in plastic foam, stored large quantities of chemical waste in drums at the southern corner of the site. A chemical spill led to severe contamination of the soil and ground water. In 1983, EPA placed the site on the National Priorities List (NPL). EPA worked with the Delaware Department of Natural Resources and Environmental Control (DNREC) to develop a plan to clean the site and allow for reuse. The City of New Castle provided an alternate water supply to residents impacted by ground water contamination. After further site investigation, EPA and DNREC determined that the ground water contamination would dissipate through natural attenuation and that soil contamination did not pose a threat to people or the environment. As a result, EPA and DNREC developed a cleanup plan that included the implementation of controls to prevent future use of ground water. Witco, the site’s potentially responsible party, implemented ground water use controls and a ground water monitoring plan. By 1996, ground water contamination levels had established safe levels by natural attenuation and Witco ended ground water monitoring. EPA deleted the site from the NPL in 1996 and Witco donated the site and historic trolley barn to the City of New Castle. The City invested over $700,000 to renovate the building and convert it to office space for the New Castle Public Works Department.
Updated 2/2013

For more information:

Sealand Limited

The Sealand Limited Superfund site covers a 0.8-acre area in Middletown, Delaware. Sealand Limited and Oil Industry operated a creosote-manufacturing plant and a coal tar, gas tar, and ink oil storage and recycling facility on the site for approximately one year, closing in 1983. Leaking tanks and drums at the site contaminated ground water and soil. EPA added the site to the National Priorities List (NPL) in 1990. EPA conducted removal activities, including the removal of 240,000 gallons of coal tar, 320 waste oil drums and 122 cubic yards of solid waste from the site. Following removal of waste oil storage tanks, EPA capped soil with one foot of clay and six inches of top soil. In 1997, EPA deleted the site from the NPL. Currently, a warehouse facility operates on site.
Updated 2/2013

For more information:

Tybouts Corner Landfill Superfund Site Green Infrastructure
Site location map

The 47-acre Tybouts Corner Landfill Superfund site is located in New Castle, Delaware. Cleanup activities have restored natural habitat and native vegetation on land once covered with hazardous waste at the site. A sand and gravel quarry operated at the site until 1968. That year, the New Castle Department of Public Works converted the site to a landfill. The landfill accepted municipal and household waste until 1971. This waste contaminated ground water at the site. Investigations discovered contamination in two drinking water wells. In response, EPA added the site to the National Priorities List (NPL) in 1983. Under EPA oversight, the site’s potentially responsible parties (PRPs) conducted cleanup activities. The PRPs installed water lines to connect residents affected by contamination in wells to the public water supply. They also constructed a landfill cap and ground water extraction system as well as venting equipment as a temporary measure to prevent gases from migrating off site. The PRPs completed construction of a permanent active gas collection system in 2000. They discontinued ground water extraction in 2007. The PRPs used wildflowers and other native plants to stabilize the ground and prevent erosion on the landfill cap. The area now provides natural habitat.
Updated 2/2013

For more information: