Best time to pick up the trash?

I emailed the City facilities manager to the fact that the trash bins outside the library were overflowing. Then I went outside and picked up some of the trash discarded on the ground and stuffed it into the already-filled bin. When I next checked my email, I found this:

Gail, I just sent this to XXXX. I am not happy about this and it will get resolved.
–J
Begin forwarded message:
From: <xxxx>
Date: November 5, 2013 at 10:52:13 AM PST
To: <yyyy>
Subject: Library grounds

I just watched Gail from the library picking up garbage around the entrance and shoving garbage into the full trash can. What is the schedule for cleaning up the library?

…….

Perfect timing! So, the best time to pick up garbage? When the stars align to have the person responsible for it drive by to see you trying to deal with it!