HILL AIR FORCE BASE
HILL AFB, UT
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Hill AFB is located in northern Utah, approximately 30 miles north of Salt Lake City and 5 miles south of Ogden. Hill AFB, originally “Hill Field” in 1940, is part of the Air Force Materiel Command. The Ogden Air Logistics Center is also based at Hill AFB. The Ogden Air Logistics Center performs operational and support missions such as engineering and logistics management for various aircraft and intercontinental ballistic missiles. Dating back to World War II, Hill AFB has been the site for maintenance and repair activities for numerous types of aircraft. Activities at Hill AFB generate various wastes including chlorinated and non-chlorinated solvents and degreasers, fuels, other hydrocarbons, acids, bases and metals. Hill AFB began investigating releases in 1976, when a nearby resident reported an orange discharge from a spring on his property near the base boundary. Waste products were historically disposed of at the Industrial Wastewater Treatment Plant (IWTP), in disposal pits and landfills on Hill AFB, or at other Air Force facilities. Waste disposal in disposal pits and landfills ceased in 1980.
What Has Been Done to Clean Up the Site?
The site is being addressed through federal and state actions.
The Air Force, with EPA oversight, has conducted five-year reviews at the site. 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 at OU3, OU5 and OU7. The remedy is protective in the short term at OU1, OU2, OU9 and OU12. Continued protectiveness requires additional data collection and evaluation. Protectiveness determinations could not be made for OU4, OU6 and OU8 until additional information is obtained. The remedy for OU13 is expected to be protective once the removal action is completed.
What Is the Current Site Status?
The site consists of 12 areas, referred to by EPA as operable units (OUs). The OUs include multiple source areas or investigation areas, such as landfills, chemical and waste pits, fire training areas, golf courses, sludge drying beds, dumps, spill areas, and groundwater contaminant plumes. The Air Force and EPA have selected final remedies for six of the OUs.
Long-term remedies include landfill caps, pump-and-treat systems for contaminated groundwater, asphalt caps, soil vapor extraction, surface water treatment, institutional controls and various other remedies. Operation and maintenance activities and monitoring are ongoing at sites with implemented remedies. Other sites are in various stages of the Superfund process, ranging from initial assessments through investigations and development of cleanup plans.