NORTH RIDGE ESTATES
KLAMATH FALLS, OR
On this page:
- What Is Being Done to Clean Up the Site?
- What Is the Current Site Status?
- EPA’s Involvement at the Site
- Emergency Response and Removal
- Operable Units (opens new page)
- Cleanup Progress (opens new page)
The North Ridge Estates Superfund Site is a residential subdivision located approximately three miles north of Klamath Falls, Oregon. The site is contaminated with asbestos as a result of the improper demolition of approximately eighty 1940s-era military barracks buildings. North Ridge Estates was added to the National Priorities List in 2011 after annual efforts to remove contamination were not effective for long-term protection of human health.
Asbestos-containing materials and soil will be removed from the old military barracks site during three seasons of cleanup. Additional contamination at the nearby Kingsley Firing Range, also part of the site, will be investigated and completed at a later time.
Clean Up Update:
The remedial construction for Season 1 began in late-July and will conclude at the end of November 2016 as heavy work is unable to be conducted during winter months. Construction staff will remain onsite through the winter months preparing for Season 2. Approximately 2 - 4 feet of asbestos contaminated soil and debris will be excavated and replaced with clean topsoil. The contaminated soil and debris will be placed in secure on-site repositories.
- What to expect during construction (PDF) (2pp, 1.3MB) - June 2016
- Project overview (PDF) (1p, 1.2 MB) - June 2016
- Asbestos and frost heave (PDF) (2pp, 7.3MB) - May 2016
- Frequently asked questions (PDF) (3pp, 1.3MB) - May 2016
- Looking ahead - Restoration (PDF) (2pp, 3MB) - May 2016
- Site history (PDF) (1p, 1.3MB) - May 2016
- Basis of Design Report without appendices (PDF) (125pp, 48MB) - December 2015
- Basis of Design Report with appendices (PDF) (1,326pp, 305MB) December 2015
- Record of Decision (PDF) (220pp, 13MB) - September 2011
- Proposed Plan for North Ridge Estates (PDF) (23pp, 9MB) - April 2010
- Final Feasibility Study Report (PDF) (523pp, 17MB) - March 2010
- Final Remedial Investigation Report (PDF) (531pp, 28.5MB) - January 2010
What Is Being Done to Clean Up the Site?
The site is being addressed through federal actions.
What Is the Current Site Status?
Remedial construction has been underway since late July 2016. Construction will take place between May and October for three years and is expected to be complete in 2018. The remedial action plan includes excavation of asbestos contaminated soil and debris, consolidation of contaminated materials in on-site repositories and capping of the repositories with clean fill. Additional cleanup actions will include capping each property with clean fill to bring it back to a natural grade, installing a visible marker layer to indicate the depth to which soil was excavated, implementing institutional controls and ongoing maintenance and monitoring.
EPA’s Involvement at the Site
To reduce risk to local residents, the EPA emergency response program annually removed asbestos-containing materials and contaminated soil and debris from the site between 2003 and 2009. EPA completed a Remedial Investigation and Feasibility Study to develop a permanent remedy for the site. The Oregon Department of Environmental Quality is also actively involved in the site cleanup.
Emergency Response and Removal
EPA first responded to the site in 2003 at the request of Oregon Department of Environmental Quality. From 2003 to 2005, all visible asbestos was picked up to address immediate threats to human health. However, due to a process called "frost heave" when the soil freezes and thaws, new contamination surfaced each spring. EPA temporarily relocated residents during the summer of 2005 and all but a few residents were permanently relocated through a third-party settlement with the polluter in 2006. Asbestos and soil removals continued for several years, but it became clear that the extent of contamination at North Ridge Estates was far more extensive than could be addressed through the removal program.
During cleanup, a site can be divided into a number of distinct areas depending on its complexity. These areas, called operable units (OUs), may address geographic areas, specific problems, or areas where a specific action is required. Examples of typical operable units include construction of a groundwater pump and treatment system or construction of a cap over a landfill.