Superfund Information Systems: Site Profile

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Site Details

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Site Background

The 100,656-acre Fort Riley site is located in Clay, Geary and Riley counties in Kansas. Sources of contamination, including landfills, dry cleaners, furniture shops, pesticide storage facilities, incinerator, OB/OD range, and MMRP sites. Contaminated groundwater and soils with volatile organic compounds (VOCs) and solvents are present at this site. Some of the five subsites are cleaned up. However, environmental risks remain and long-term cleanup is ongoing. Operation and maintenance activities and monitoring are ongoing.

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Site Status

The Southwest Funston Landfill subsite remedy included institutional controls to prevent future use of groundwater and certain land uses, and long-term groundwater monitoring. Cleanup activities finished in 1997. Subsite cleanup has also included removal actions, or short-term cleanups, to address immediate threats to human health and the environment. Removal actions stabilized the Kansas River bank and reduced infiltration through an evapotranspiration cover.

The Former Pesticides Storage Facility remedy included removal of contaminated soils. EPA declared a remedy of “no further action” in 1997 after cleanup ended in 1994.

The selected remedy for the Dry Cleaning Facilities Area is monitored natural attenuation. Natural attenuation describes a variety of in-place processes that, under favorable conditions, act without human intervention to reduce the mass, toxicity, mobility, volume or concentration of contaminants in groundwater. Cleanup activities have not yet started.

In 2005, EPA declared monitored natural attenuation with institutional controls to prevent use of groundwater as the selected remedies for the Marshall Army Airfield Former Fire Training Area. Removal actions, or short-term cleanups, in 1994 and 1995 addressed soil contamination. The most recent review detailed that the remedy has achieved remedial action objectives (RAOs). Following cleanup, the area is available for unlimited use and unlimited access.

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Work to Protect Human Health and the Environment

The site is being addressed through federal actions. Fort Riley is participating in the Installation Restoration Program, a specially funded program established by the Department of Defense (DoD) in 1978 to identify, investigate and control the migration of hazardous contaminants at military and other DoD facilities.

EPA has conducted several five-year reviews of the site’s remedy. These reviews ensure that the remedies put in place protect public health and the environment, and function as intended by site decision documents. The most recent review concluded that response actions at the site are in accordance with the remedy selected by EPA and that the remedy continues to be protective of human health and the environment in the long term at the Southwest Funston Landfill and Dry Cleaning Facilities Area subsites. EPA could not make a protectiveness determination for the Area Solvent Detections subsite until it collects more information about vapor intrusion pathways. Vapor intrusion occurs when volatile chemicals from contaminated groundwater or soil migrate into indoor air spaces of overlying buildings.

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Site Risks

Risks and pathways addressed by the cleanup include health risks from people ingesting or touching contaminants in soil and groundwater.

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Emergency Response

EPA performed a removal action at the Building 354 Solvent Detections Area in 2004 that successfully treated and removed about 1,000 cubic yards of contaminated soil. This action eliminated the source of groundwater contamination at this subsite. The selected remedy for this subsite is natural attenuation with institutional controls to prevent drilling of drinking water wells.

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