Contaminated Military Bases:
- Marine Corps Logistics Base Barstow
- El Toro Marine Corps Air Station (decommissioned)
- Mather Air Force Base
- McClellan Air Force Base
- March Air Force Base
- Norton Air Force Base
- Camp Pendleton Marine Corps Base
24 Bases with reported TCE water contamination
(Source: Agency for Toxic Substances and Disease Registry)
Middletown Air Field
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From 1868 through 1966, the United States Federal Government owned and operated the Middletown Air Field as the Olmstead Air Force Base. The site encompasses approximately 200 acres located between Middletown and Highspire in Dauphin County, Pennsylvania. Now privately and Commonwealth-owned, the property houses Harrisburg International Airport, a Pennsylvania State University Campus, several industrial properties, and storage for the Middletown School District. Historically, the site was utilized for the maintenance, overhauling, and testing of aircraft as well as housing United States Air Force (USAF) personnel. The HIA portion of the site was operated by the Pennsylvania Department of Transportation (PennDOT) from 1966 until 1997 when it was sold to SARAA.
In 1983, discovery of chlorinated solvent contamination in six of ten HIA water supply wells resulted in the temporary shutdown of the supply system. A water treatment system was installed by the major PRPs at the site, PennDOT and USAF, under an agreement with EPA. This action returned all of the supply wells to potable use. The water supply on the site provides water to about 3,500 full-time area residents, as well as to airline travelers and industrial users. Located in a mixed residential and industrial area, approximately 19,500 people obtain drinking water from wells within 3 miles of the site.
As a result of the September 2007 Five Year Review, the protectiveness of the remedies and institutional controls were more closely evaluated. The evaluation indicated that that the remedy currently in place at the North Base Landfill portion of the site is protective and no additional investigation is necessary. Additionally, EPA and PADEP requested that SARAA conduct groundwater sampling at the HIA portion of the site to determine if a vapor intrusion investigation will be necessary. EPA and PADEP are currently reviewing data from the additional sampling and an Addendum to the Five Year Review will be prepared once the data evaluation is complete.