The documents may have evidence of residual plutonium contamination and other ongoing environmental dangers.
The wildlife refuge's past as a Superfund site has caused concern among environmental groups.
The City of Colorado Springs will place prominent signs around parks being sprayed with pesticides and weed killer.
Mayor Michael Hancock is promoting a series of plans for the city that spans the next 20 years.
The director of Denver Parks & Rec. says some want more activities, while others go to parks seeking refuge from the city’s bustle.