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Macalloy Corporation


Aerial view of the Macalloy Corporation site prior to cleanup.

Additional Resources
Site Summary Profile
EPA ID: SCD003360476
Location: North Charleston, SC
Lat/Long: 32.838050, -079.951190
Congressional District: 06
NPL Status: Proposed: 10/22/99; Final: 2/04/00
Affected Media: Ground water, Sediment, Soil
Cleanup Status: Construction complete - physical cleanup activities have been completed
Human Exposure Under Control: Yes
Groundwater Migration Under Control: Yes
Sitewide Ready for Anticipated Use: Yes
Site Reuse/Redevelopment: Site is in partial reuse – industrial land uses are located on site
Site Manager: Craig Zeller (zeller.craig@epa.gov)

Current Site Status

The Macalloy Corporation site includes the area where a ferrochromium alloy smelting plant operated from 1941 until 1998. EPA placed the site on the National Priorities List (NPL) in 2000 because of contaminated ground water, sediment and soil resulting from facility operations. EPA, the South Carolina Department of Health and Environmental Control (SCDHEC) and the Macalloy Potentially Responsible Party Group, the site’s potentially responsible parties (PRPs), have investigated site conditions and taken steps to clean up the site in order to protect people and the environment from contamination. Site contamination does not currently threaten people living and working near the site. By monitoring ground water, placing institutional controls on the site property and undertaking Five-Year Reviews, EPA, SCDHEC and the site’s PRPs continue to protect people and the environment from site contamination.

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Site Location and Background

The site is located at 1800 Pittsburgh Avenue on a section of the Charleston Peninsula formed by the confluence of the Ashley and Cooper Rivers in Charleston, South Carolina. A tidal creek and marsh along Shipyard Creek border the site to the north and east, industrial and commercial land uses border the site to the south, and a CSX rail line borders the site to the west. Union Heights, a neighborhood with low-income and minority residents, is located just west of the site, past a CSX rail line. The Koppers Co., Inc. (Charleston Plant) Superfund site is located approximately one half-mile south of the site.

From 1941 until 1998, a ferrochromium alloy smelting plant operated at the site. Plant operations included separating metal content from its ore using furnaces. Pittsburgh Metallurgical Company operated the plant from 1941 to 1966; Airco (British Oxygen Corporation) operated the plant from 1966 to 1979; and Macalloy Corporation operated the plant from 1979 to 1998. The Department of Defense has owned, operated or used areas of the site to produce and store ferrochromium alloy, chrome ore and slag since 1942. Operations at the site also collected an estimated 80,000 tons of air pollution control material, consisting of collected particulate dust and sludge, in an unlined surface reservoir on site. The plant discharged process water off site to the Shipyard Creek and a wetlands area. In 2000, EPA listed the site on the NPL.

In 2005, Ashley II of Charleston, LLC purchased the site and developed approximately 30 acres on the southern portion of the site into an industrial park. Approximately 110 acres on the northern portion of the site remains undeveloped and covered with trees and shrubs. The site’s cleanup can support industrial land uses.

View site location map.

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Threats and Contaminants

Site investigations found contamination in ground water, sediment and soil that could potentially harm people in the area. Contamination resulted from waste disposal practices at the site. Contaminants of concern include hexavalent chromium, nickelzinc and chromium.

Contamination affected a 20-acre area of ground water, which is confined within the site boundary.

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Investigation and Cleanup Responsibility / Oversight

Macalloy PRP Group, the site’s PRPs, led site investigation and cleanup activities, with oversight provided by EPA and SCDHEC.

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Site Cleanup Plan

In 2002, EPA issued a cleanup plan (a Record of Decision, or ROD) for the site. The plan included the following activities:

A research partnership with EPA’s Office of Research and Development during site investigations and studies resulted in the selection of chemical reduction as the cleanup plan for ground water treatment in the ROD.

Summaries of site cleanup approaches are also available online in key site cleanup documents, including the ROD.

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Cleanup Progress

In 1998, the site’s PRPs began short-term cleanup activities to reduce contaminants flowing into Shipyard Creek. Cleanup activities included construction of structures designed to remove solids from stormwater runoff prior to discharge.

During 1999, the PRPs dug up approximately 40,000 tons of contaminated dust in the reservoir, treated it and disposed of it at an off-site landfill. From 2004 until 2006, the PRPs conducted the remaining cleanup activities.

In November 2006, EPA recognized the site as the Superfund program’s 1,000th Construction Completion at a celebration held at the site.

The PRPs completed surface water sampling in 2008.

The site’s third Five-Year Review, completed in 2010, found that the cleanup remains protective of human health and the environment.

Summaries of cleanup activities are also available in Five-Year Reviews online.

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Enforcement Activities

EPA negotiated legal agreements with the site’s PRPs to investigate and clean up the site. The PRPs continue to fund monitoring and oversight activities.

The ROD and Five-Year Reviews online provide additional information on specific legal agreements for the site.

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Community Involvement

EPA has worked with the community and its state partner to develop a long-term cleanup plan for the site, reflecting the Agency’s commitment to safe, healthy communities and environmental protection. Community engagement and public outreach are core components of EPA program activities.

EPA has conducted a range of community involvement activities to solicit community input and to make sure the public remains informed about site activities throughout the cleanup process. Outreach efforts have included public notices, interviews and public meetings.

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Future Work

Semi-annual ground water monitoring is ongoing.

EPA completed the last Five-Year Review in 2010 and plans to complete the next Five-Year Review in 2015.

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Additional Information

EPA keeps additional site documents and information in a site information repository at the location below. EPA also posts site documents, when available, on EPA’s CERCLIS Site Profile page. For documents not available on the website, please contact the Region 4 Freedom of Information Office.

Site Repository

Charleston County Main Library
68 Calhoun Street
Charleston, SC 29401

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