U.S. Air Force Plant 44

U.S. Air Force Plant 44

Superfund Site | U.S. Air Force Plant 44: Page 2 of 2

Action Taken

A large-scale pump-treat-reinject system is operating with both advanced oxidation process (AOP) and air-stripping treatment.  This system pumps contaminated groundwater from the higher concentration portions of the aquifer and reinjects the treated water at the perimeter of the site to help provide hydraulic containment of the plume. 

Beginning in 1995, nearly 57,000 tons of metals contaminated soils (cadmium, chromium, and lead) were excavated and removed from the site. The Air Force also conducted soil excavation at the 1980s Pistol Range to remove lead contaminated soil, and in 2015, issued a Record of Decision (ROD) for No Further Action (NFA).  

Dual-phase extraction (DPE) and Soil Vapor Extraction (SVE) systems operated between 1996 and 2008.  Together, the DPE and SVE systems removed approximately 107,514 pounds of VOCs from subsurface soils.  In-Situ Chemical Oxidation (ISCO) was implanted beginning in 2010 at AFP-44 VOC source areas, and the Air Force is currently conducting hydraulically fracturing and in-situ treatment of groundwater contamination within fine-grained source areas.

Status

The groundwater remediation system is in continuous operation at approximately 5,000 gallons per minute.  It has removed approximately 25,082 pounds of VOCs from the Regional Aquifer, and has treated over 32.8 billion gallons of groundwater between April 1987 and May 2017.  The groundwater remediation system at AFP-44 includes an AOP treatment system to treat 1,4-dioxane, which began continuous operation in 2009, and air strippers to treat VOCs.  Currently, the Air Force is working on a Record of Decision Amendment for groundwater to incorporate the AOP treatment process.

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