We are a private association library. There is a "difficult" patron who sits on a bench (almost everyday doing nothing but trying to talk to anyone nearby) which is immediately next to our front doors on library property. We are doing curbside pick-up so the staff places the library items immediately outside the front doors on a table. The patrons come to the table to pick them up. The "difficult" patron refuses to wear a mask no matter who asks and how many times he is asked. We recently found out that he was exposed to someone who has COVID. The police tried to offer a mask to this patron and he still refused. We were told to call the police if he returns. When he did, the police never came. This patron is a health hazard to the staff and our patrons. What else can we do?
***THIS ANSWER IS NOT FOR PUBLIC LIBRARIES***
Here is what else you can do:
A library’s pandemic Safety Plan is not set in stone; it should be a living document that evolves as the library’s operations and our overall knowledge about COVID transmission change.
With that in mind, revising its Safety Plan to ensure the physical layout of its curbside operations could be a good solution to this member’s situation.
Here are some possible revisions to accomplish this:
NOTE: As with any adoption or revision of a Safety Plan, to the greatest extent possible, check in with your local Department of Health (I appreciate that in some places, the Department of Health may be so overwhelmed that this "check-in" is impossible).
Since it is best to have your library board "on board" with the library's Safety Plan, and any changes to it, below is a proposed resolution for adopting such a change:
BE IT RESOLVED, that to ensure the Library's Safety Plan is evolving as our information, operations, and needs evolve, the board adopts the attached [date] version of the Safety Plan, effective [date/immediately].
Now, all that said, I know there could still be a few hiccups (plans on paper often get shredded by reality). Here is the obvious “hiccup” I see, and a proposed way to address it:
If the "difficult" patron suddenly discovers that the bench they like to use and socialize from is suddenly not there/unavailable, and they have a strongly negative reaction—yelling abuse, or even being physically violent—that is when to call law enforcement, and of course to invoke your Code of Conduct and consider barring or suspending them from the library, as circumstances warrant.
But hopefully, with some modifications to the Safety Plan, and good communication of the changes, this concern can be resolved in a way that not only addresses this specific issue, but deters any other visitor who could pose such a threat.
Please let us know if this approach proves effective.
 I trust public libraries know why this guidance is not for them, but since it is an important reason, I'll footnote it: adjustments to practices that can be demonstrably tied to a concern caused by one individual need to be carefully developed to ensure they cause no constitution-based due process or disparate treatment concerns. Basically, a public library can take the exact same measures I propose in here for this private association library, but must be even more cautious to ensure their actions are not—and cannot reasonably be perceived as—discriminatory or unfair.
 This answer is being composed on January 11, 2021.
 Although the current Safety Plan templates posted on the NY Forward site set out a requirement of six feet, there is nothing saying that an established safety perimeter can't be more (I was at a hotel that used 15 feet, and gave us our room key-cards via a system that felt like I was at a drive-up teller).
 Per Education Law 226(2), the executive committee of your board may have the power to adopt this change without a full meeting, but CHECK YOUR ASSOCATION LIBRARY'S BYLAWS to make sure you can use this approach; if there is no executive committee, your library can follow its procedures for a special meeting or an e-mail vote of the full board.
 firstname.lastname@example.org (Stephanie "Cole" Adams) and email@example.com (paralegal Jill Aures), thanks.