A study conducted by the Associated Press showed that the agency has concerns with incomplete pollution cleanups at over 100 Defense Department facilities. Since 1988, 34 military bases closed in the United States are listed on the EPA's Superfund list. Most of these bases have been on the list for at least 15 years. Officials anticipate that more facilities will be added to the list after the next round of base closures.

"A large majority of these [Superfund] sites will have all the remedies in place by 2015," said Jim Woolford, head of the EPA's Federal Facilities Restoration and Reuse Office. "It may take longer to remove them from the list because of groundwater contamination or unexploded ordinance."

The Pentagon has spent $8.3 billion so far on pollution cleanups and compliance with other environmental laws. Of the 34 closed bases, 28 have been on the list for at least 15 years. Officials claim they expect to have most of the cleanups nearly completed by 2015. However, 10 of the sites are not yet fully under control.

"The environmental issues, including what type of cleanup needs to be done, have been the main holdup on all of these places," said Glenn Flood, a Pentagon spokesman. "We'll get it done, but it's going to take time in some cases as we work with the communities."