There is a detailed discussion of the Refuge and sampling within it in documents about the cleanup and elsewhere on the website.
As of November 2023, the Fish&Wildlife links below should be consulted for new developments.
Click on images below for a better look.
Current status
Lots of information can be found (of course) at the Fish&Wildlife service
A nice PDF map of current trails may be found at
https://www.fws.gov/media/rocky-flats-nwr-trail-mappdf
and online maps at
https://www.fws.gov/refuge/rocky-flats/visit-us/trails
You can examine plans for the Multi-Purpose Building and planned "improved visitor access at
https://www.fws.gov/refuge/rocky-flats/library
TheĀ Refuge Trails and Greenway Project is proceeding apace according to the Federal Register and the Federal Highway Administration as of August 10, 2023.