Remedial Action for Operable Unit 1, Annapolis Lead Mine Superfund Site, Annapolis, Iron County, Missouri
The U.S. Environmental Protection Agency, Region 7, will begin work at the Annapolis Lead Mine Site in August and continue through September 2007. The selected remedy consists of the removal of sediment impacted by mining waste, stabilization of the stream banks, and erosion control in the historical mining area. Contaminated sediment will be added to the existing repository for lead contaminated materials and covered with a vegetated soil cap.
The remedial work will be done in accordance with the final plans and specifications
developed during the remedial design/remedial action phase.
It will also conform to the Record of Decision for Operable Unit 1.
Contaminated sediment addressed by this remedial action is located within Sutton Branch Creek, which is a tributary of Big Creek and part of the St. Francis River Watershed. Sutton Branch Creek lies close to the Annapolis lead mine.
Lead mining occurred at the site from approximately 1919 to 1940, and over one million tons of mining waste was generated during that time. The contaminants of concern are residual metals, particularly cadmium, lead, and zinc.
The contamination was caused by lead ore mining and processing. The mining and processing generated chat piles and tailings, which were the sources of the contaminants of concern for this action. However, the chat piles and tailings have been contained by prior EPA cleanup activities. Surface water bodies located downstream from the site contain elevated concentrations of site-related hazardous substances that could pose a threat to recreational fisheries and wetlands in the area. Sampling of Big Creek has demonstrated that the impacts do not go past the confluence of Sutton Branch Creek with Big Creek.
In September 2003, EPA proposed a Time-Critical Removal Action for the Annapolis Lead Mine Site. The goal of the removal action was to identify, consolidate, and stabilize the lead contaminated mine waste on site. The time-critical removal work began at the site in May 2004. When the removal action began at the site, settling basins were constructed to manage storm water runoff. Earth moving equipment was used to form the tailings and contaminated soil into a mound in the middle of the ravine where the pile was originally located. All areas in the tailings pile vicinity with an average lead surface concentration greater than 1,000 parts per million (ppm) were defined and removed.
All excavated areas were backfilled with clean material. The excavated soil was consolidated into the on-site tailings pile and the tailings pile was graded and compacted. A protective cover was installed over the tailings. The protective cover consists of uncontaminated clay and topsoil, allowing for the establishment of vegetative cover.
The work to be conducted at the site this summer includes the following activities:
- Repair of erosion around the repository and the historical mining area. Work in this area is required to protect the integrity of the existing soil repository and to prevent further runoff of soils into Sutton Branch Creek. The soils that have been eroding off the repository are not contaminated with lead.
- Removal of lead-contaminated sediment from Sutton Branch Creek. Lead-contaminated sediment in selected pool areas will be removed to reduce risk to the environment. The natural base of Sutton Branch Creek is covered with contaminated sediment. This sediment will be removed until the natural base is uncovered.
- The banks of the excavated areas of Sutton Branch Creek will be stabilized.
EPA encourages the community to review the Administrative Record which
is available at the following locations:
204 School Street
EPA Region 7
901 N. 5th Street
Kansas City, Kansas
If you have questions or need additional information, please contact:
Office of Public Affairs
U.S. EPA Region 7
901 N. 5th Street
Kansas City, KS 66101
Toll Free: (800) 223-0425