Luke Air Force Base

Planes taxiing on runway at Luke Air Force Base

Luke Air Force Base | Delisted DOD Site

Location

The Luke Air Force Base (LAFB) site occupies 4,198 acres in Glendale, Arizona, which is approximately 13 miles west of downtown Phoenix. There are approximately 4,900 military personnel and dependents living on base. Civilian and other military personnel who commute to the base daily from off-base areas bring the total daily base population to approximately 8,000.

Contaminants of Concern

Contaminants used on site included organic solvents and paint strippers, waste oil spills, petroleum spills, metal plating wastes, hydraulic fluids, and radiological wastes. Soil was contaminated with waste oils and volatile organic compounds resulting from the diverse processes that have taken place at the site. Potential human health hazards included accidental ingestion or direct contact with contaminated materials.

Public Health Impact

There is no known risk to human health at this time. All exposure pathways have been eliminated through remediation or restricted access/use. No groundwater wells are known to be impacted. There was no cleanup of groundwater required, and the AF is continuing long-term groundwater monitoring to assure that it is not impacted in the future. The site is protective of human health and the environment.

Site Hydrogeology

The base is located within the Sonoran Desert and rests on a broad alluvium-filled valley within the western portion of the Phoenix basin characterized by hot, dry summers, mild winters, and low precipitation. The depth to groundwater in the area is greater than 200 feet below the surface with a relatively low flow gradient.

Action Taken

In 2016 and 2017, the fourth Five Year Review (FYR) was conducted and determined that all remedies are functioning as designed, continue to be protective of human health and the environment, and control exposure pathways that could result in unacceptable risks. The next FYR will be due January 30, 2022.

In late June 2017, LAFB submitted a site inspection work plan of the Aqueous Film Forming Foam Release Areas, which includes the investigation of per- and polyfluorinated alkyl substances (PFAS).

In late August 2017, LAFB submitted to ADEQ and the U.S. Environmental Protection Agency a Draft Explanation of Significant Differences (ESD) for Site DP-013 – Drainage Ditch Disposal Area. The purpose of this ESD is to request site closure with no land use restrictions or requirements for FYRs under CERCLA program for the contaminants of concern identified in the Record of Decision for this site only.

Status

The site inspection for PFAS was completed in fall of 2017. The ESD for Site DP-013 has been submitted and is currently under Agency review.