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Stono Phosphate Works
National Information
Photos/Multimedia
Site photo goes here.
- Additional Site Photos
- Site Video
Additional Resources
- Site Cleanup Terms - can be found in EPA's glossary
- EPA Guides to Cleanup Technologies
- Superfund Community Involvement (PDF) (17 pp, 130K, About PDF)
Site Summary Profile
EPA ID: SC0002316404Location: Charleston, Charleston County, SC
Lat/Long: 32.831108, -079.963852
Congressional District: 01
NPL Status: Superfund Alternative Approach
Affected Media: Ground water, Sediment, Soil
Cleanup Status: A Non-Time-Critical Removal Action has been selected and is currently underway.
Site Reuse/Redevelopment: Potential for Commercial/Light Industrial
Site Manager: Ken Mallary (mallary.ken@epa.gov)
Site Background
The 15-acre Stono Phosphate Works site is located on the Ashley River in Charleston, Charleston County, South Carolina. From approximately 1900 to the late 1950s, the site was used for the production of phosphate fertilizer. The phosphate-based fertilizer manufacturing process involved reacting phosphate ores with sulfuric acid to produce phosphoric acid, the building block of Nitrogen-Phosphorus-Potassium (N-P-K) agricultural fertilizers. Sulfuric acid was made at the site and stored in lead-insulated chambers.
The site is not listed on the National Priorities List (NPL), but is considered to be an NPL-caliber site and is being addressed through the Superfund Alternative Approach. This approach uses the same investigation and cleanup process and standards that are used for sites listed on the NPL.
Threats and Contaminants
Environmental impacts associated with phosphate fertilizer manufacturing at the site include elevated levels of metals, including lead and arsenic, in soil, sediment, and ground water, as well as acidic pH conditions.
Site Cleanup Plan
Based on the results of a 2004 engineering evaluation and cost analysis (EE/CA), EPA signed an Action Memorandum which authorized the use of a Non-Time-Critical Removal Action (NTCRA) at the site, and provides a description of the preferred alternatives selected to address site-related contamination.
Cleanup Progress
The Non-Time-Critical Removal Action selected in the EPA Action Memorandum was initiated in January 2011, and will be completed in early July 2011.
Enforcement Activities
On October 10, 2000, ExxonMobil Corporation, successor in interest to the Stono Phosphate Works site, voluntarily entered into an Administrative Order on Consent, in which ExxonMobil agreed to conduct an EE/CA for the site. A separate order was signed in 2004 to conduct a NTCRA at the site.
Community Involvement
EPA has conducted a range of community involvement activities at the Stono Phosphate Works site to solicit community input and to ensure that the public remains informed about site activities throughout the site cleanup process.
Future Work
Once the NTCRA is complete, groundwater monitoring will be required for a minimum of 5 years to determine the effectiveness of the NTCRA.
Site Administrative Documents
Site Repository
For more information or to view any site-related documents, please visit the site information repository at the following location. As new documents are generated, they will be placed in the information repository for public information.
Charleston County Public Library
68 Calhoun Street
Charleston, SC 29401
For documents not available on the website, please contact the Region 4 Freedom of Information Office.