Prior to the release, the EPA Host System will be unavailable starting around 5:00 p.m. ET on Friday, September 10th until the afternoon of Saturday, September 11th, and again the morning of September 15th until the release is completed later that day. At that time, users will be able to connect to the EPA Host System.
While the EPA Host System is unavailable, the following functionality is not available in the Client Tool: synchronize, retrieve, and submit. During that time, users can only work with the Client Tool "offline."