You may want to read through this thread (http://forums.radioreference.com/co...ding-removal-mobile-relay-associates-smr.html) on how one agency attempted to request removal and what this site was willing to do to accommodate such a request in the past. Be aware, the thread is rather long and strays off topic quite a bit, but concentrating on the founder of this site, various site moderators, etc. you can avoid much of the static.
While that request is for the removal from the RR database, not a feed, the process and procedures are likely similar. One thing that may make feed removal easier would be if that feed violates the site's terms for providing a feed. I'll leave that part up to you to research.
As expected, the agency has the ultimate final word on whether or not they will be streamed. Its best to get their approval and doesn't pay to play the arrogant card.