Kansas City International Airport (MCI) Maintenance Base
EPA ID# MOD043935048
- Former Company Name: American Airlines MCI Maintenance and Engineering Base, Trans World Airlines Inc., TWA Airlines LLC.
- Type of Facility: Hazardous Waste Storage and Disposal - closing.
- Wastes Handled: Aqueous wastes (treated wastewater).
- Treatment and Disposal Methods: Land disposal - closed.
- Location of hard copies of hazardous waste permit application, Part I and Part II Permits, modification requests, reports, etc. and supporting documents:
The City of Kansas City is conducting corrective action activities and performing long-term monitoring and maintenance of the closed surface impoundments and landfill at the Kansas City International Airport (MCI) Maintenance Base under two hazardous waste permits. The status of the post-closure and corrective action activities at the facility is described below. The public can review and copy paper copies of all permits, reports and supporting documents at the agency locations above.
The Kansas City International Airport (MCI) Maintenance Base is located at 9200 N.W. 112th St. in Kansas City, Missouri. The facility’s original structures were built in 1956, and originally covered about 250 acres leased from the City of Kansas City, Missouri. The facility is owned by the City of Kansas City and previously operated by American Airlines, formerly Trans World Airlines Inc. (TWA). American Airlines/TWA performed a variety of maintenance and overhauling activities on aircraft frames and engines at the site.
Due to the facility’s size and the variety of processes necessary to clean, service and repair various aircraft, facility operations produced a variety of hazardous wastes. Some areas at the facility were used to stage scrap metal and other scrap materials before being picked up by a metals salvage company. These scrap metals included lead-acid batteries and empty steel/plastic drums. EPA conducted an inspection in June 1985 and discovered that TWA was also operating two unpermitted, non-interim status hazardous waste surface impoundments. From 1972 through 1987, the facility used the two surface impoundments as a final step in treating wastewater produced during the maintenance activities. The impoundments treated approximately 400,000 gallons of wastewater per day. The main constituents of the wastewaters were hexavalent chromium, cyanide, oil and grease.
The facility also operated a hazardous waste landfill (Ravine Area) from the early 1960s through 1983, to dispose of a combination of excavated soils, construction debris, industrial waste materials (including spent degreasing solvents and sandblasting oxides) paint strippings and possibly wastewater treatment sludges. TWA, the City of Kansas City, Missouri, and other contractors involved in airport construction projects also used another landfill during the late 1960s-early 1970s, which is located on property owned by the City of Kansas City Missouri, but was not part of the facility’s leased property. The second landfill was used for about five years, mainly for construction debris, demolition waste and disposal of plating/petroleum sludges cleaned out from some lagoons at the site. No records of landfill activities were maintained for this area, so an accurate estimate of the types and quantities of materials disposed of in this area is not possible.
Post-Closure and Corrective Action Status
In 1989, EPA issued a 3008(h) Corrective Action Administrative Order on Consent, requiring the facility to conduct an investigation and take corrective measures for the site. Both surface impoundments and landfills have since been closed and capped with uncontaminated soil. EPA accepted the closure report and certification for the hazardous waste management units; however, because hazardous waste remained in place after closure, the areas are also required to go through a period of post-closure care.
The approved final remedy for soil and groundwater contamination is already in place at the facility, which includes a passive interceptor trench between the surface impoundments and Todd Creek. A groundwater monitoring program is used to determine where the contaminated groundwater is located (horizontal and vertical extent of contamination) and how fast the contaminated groundwater is moving (rate of migration) in addition to determining the effectiveness of the corrective action measures implemented at the site. Two Deed Restrictions were placed on parts of the property, one on the surface impoundments area and one for the Ravine Area, in order to inform potential future buyers of the property that these areas of the property have been used to manage hazardous waste and disturbance of the soil is restricted.
The monitoring programs were updated in August 2010, changing from a compliance monitoring to a corrective action monitoring program. The changes to the groundwater monitoring program also included reducing the sampling frequency from twice a year to once a year, changing the indicator parameters being analyzed and changing the number of wells included in the groundwater monitoring program.
The facility is subject to the permitting requirements of the Missouri Hazardous Waste Management Law and federal Hazardous and Solid Waste Amendments for post-closure care because hazardous waste remained in place after closure. The facility is also subject to corrective action because they completed closure after the effective date of the federal Hazardous and Solid Waste Amendments.
The City of Kansas City is conducting post-closure and corrective action activities at the Kansas City International Airport (MCI) Maintenance Base under two hazardous waste permits, one issued by the department and on issued by EPA, both effective Aug. 11, 2010. The department issued the Missouri Hazardous Waste Management Facility Part I Permit. EPA issued the Hazardous and Solid Waste Amendments Part II Permit. These permits require the City of Kansas City to continue corrective action activities at the facility and continue to perform long-term monitoring and maintenance of the closed surface impoundments and landfill.
**American Airlines filed an appeal on the hazardous waste permits, regarding being named as the “operator” on the permits. Both permits were originally issued to the City of Kansas City as the “owner” and American Airlines as the “operator.” American Airlines and the City of Kansas City reached an agreement where the City of Kansas City will assume the role of operator under the permits. American Airlines voluntarily withdrew their appeal petition and the Administrative Hearing Commission dismissed the appeal.