Question: Where is the designated Superfund site, which is the home to multiple squadrons, located?
Context: The Koppers Co., Inc. (KCI) Superfund Site is one of three Superfund sites in Oroville, California, along with Louisiana Pacific Sawmill and Western Pacific Railyard.  The KCI Superfund Site is a 200-acre site which served as a wood treatment plant for 50 years.  Wood was treated with many chemicals to prevent wood deterioration.  The accumulation of these chemicals from spills, fires, and uses has caused this site to be contaminated with hazardous waste material.  Due to soil and groundwater contamination, the site was placed on the National Priorities List in 1984 for remedial action plans to clean up the site to protect surrounding residential areas concerning environmental and human health risks. The Ashland/Northern States Power Lakefront Superfund site is a contaminated region of the Wisconsin shoreline of Lake Superior that is being studied for remediation by Northern States Power Wisconsin (NSPW), as well as the Environmental Protection Agency (EPA), the Wisconsin Department of Natural Resources (WDNR).  This site has held a manufactured gas plant from 1845 to 1947, as well as lumber manufacturing and treatment mills for four decades at the start of the 20th century, railcar loading facilities, and a municipal landfill.  Additionally, a wastewater treatment plant is located on the premises, but is not in operation.  Contamination of the site is currently believed to have been caused by all the parties mentioned above, or former owners of the property whose companies are no longer in business.  The area is listed as a Superfund site by the EPA under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).  Releases of hazardous substances occurred onshore and migrated into sediment in Chequamagon Bay on Lake Superior. The Limestone Road Superfund Site is a Superfund site located in Cumberland, Maryland on land on both sides of Limestone Road.  "The Site is located in the Valley and Ridge physiographic province of the The Brio Superfund site is a former industrial location in Harris County, Texas at the intersection of Beamer Road and Dixie Farm Road, about 16 mi southeast of downtown Houston, and adjacent to the Dixie Oil Processors Superfund site.  It is a federal Superfund site, although it was deleted from the National Priorities List in December 2006.  A neighboring residential subdivision called South Bend, now abandoned, was located along and north of the northern boundary of Brio North.  The former South Bend neighborhood consisted of about 670 homes, an elementary school, and a Little League baseball field.  Documents pertaining to the Brio Superfund site are located at the San Jacinto College South Campus Library, which houses Brio Site Repository Documents, U.S. Environmental Protection Agency (EPA) Administrative Records, and documents concerning the adjoining Dixie Oil Processors site. This is a list of Superfund sites in Nevada designated under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) environmental law.  The CERCLA federal law of 1980 authorized the United States Environmental Protection Agency (EPA) to create a list of polluted locations requiring a long-term response to clean up hazardous material contaminations.  These locations are known as Superfund sites, and are placed on the National Priorities List (NPL).  The NPL guides the EPA in "determining which sites warrant further investigation" for environmental remediation.  As of November 29, 2010, there was one Superfund site on the National Priorities List in Nevada, with no further sites proposed for addition.  No site has yet been removed from the list. The Del Amo Superfund Site is a U.S. EPA Region 9 Superfund Site.  It is one of 94 Superfund Sites in California as of November 29, 2010. Yuma International Airport (IATA: YUM, ICAO: KNYL, FAA LID: NYL) is a joint use airport with civilian and military flight activity operated in conjunction with the U.S. Marine Corps via the Marine Corps Air Station Yuma.  The airfield is located three nautical miles (6 km) south of the central business district of Yuma, a city in Yuma County, Arizona, United States.  It is mostly used for military aviation, but is also served by one commercial airline and one aeromedical Medevac company as well as being used for general aviation activities. The 102nd Street chemical landfill, is a former chemical landfill located on the Niagara River in Niagara Falls, New York.  It is almost immediately adjacent to the infamous Love Canal chemical landfill, which are split from each other by the LaSalle Expressway and Frontier Avenue.  Hooker Chemical Company, a subsidiary of Occidental Petroleum, and Olin Chemical, who were the original owners of the site, were ordered to clean up the site and pay $16,500,000 by the United States Environmental Protection Agency.  It is a designated Superfund site, and is closed to the public. Marine Corps Air Station Yuma or MCAS Yuma (ICAO: KNYL, FAA LID: NYL) is a United States Marine Corps air station which is the home to multiple squadrons of AV-8B Harrier IIs of the 3rd Marine Aircraft Wing, Marine Aviation Weapons and Tactics Squadron 1 (MAWTS-1), Marine Test and Evaluation Squadron 22 (VMX-22) and Marine Fighter Training Squadron 401 (VMFT-401), an air combat adversary squadron of the 4th Marine Aircraft Wing of the Marine Corps Reserve.  It is a designated Superfund site due to a number of soil and groundwater contaminants, including asbestos. Williams Air Force Base is a former United States Air Force (USAF) base, located in Maricopa County, Arizona east of Chandler, and about 30 mi southeast of Phoenix.  The area has since been annexed by the city of Mesa.  It is a designated Superfund site due to a number of soil and groundwater contaminants.
Answer: Yuma County, Arizona