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Background

The site is a former Naval Auxiliary Air Station now operated by the Dare County Regional Airport, located in the Outer Banks region of North Carolina. In 2008, a fuel leak was discovered, prompting the removal of six underground storage tanks (USTs), 455 tons of petroleum hydrocarbon (PHC) impacted soil, and 300 tons of sludge. Soil confirmation sampling completed as part of this effort revealed PHC impacts below the USTs and piping. A Comprehensive Site Assessment (CSA) was performed in February of 2009 to delineate the extent of PHC contamination. In March of 2011, the responsible party removed an additional 1,366 tons of contaminated soil from the site. Following the excavation, PHCs were detected above the North Carolina Groundwater Quality Standards (NCGWQS) in site monitoring wells, including benzene, isopropylbenzene, and total petroleum hydrocarbons (TPH-C5-C8 aliphatic compounds).