In the community where they work.
Minimum of 8 hours a month with a yearly 200 hour minimum. That way they have to actually take the time to be involved in the community instead of rushing to get it all done in a few sessions. It also makes them more accountable for their actions because they won't have the opportunity to hide out if they commit some egregious action. They have to head right back into the community and face the residents.

One time to be reprimanded for insensitivity (racial/gender identity/sexual orientation). Have sensitivity training, not the joke slap on the wrist type but actual time spent with thosethat were targeted (accountability). A second time is automatic dismissal.