Federal officials say safety is still a concern at the Pueblo Chemical Depot because of leaking weapons.
Quality assurance specialist Lisabeth Watchutka says more than 100 of the 780,000 chemical weapons stored at the depot have leaked since 1973.
Authorities say no one goes in without gas masks or other breathing equipment and storage facilities are constantly monitored for any leaks.
The Pueblo weapons are scheduled to be dismantled by 2017 under an international treaty.
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