Sounds like the EPA is usually late in replying to many people. The whole thing seems rather unorganized.
"A written evaluation provided by the external peer review will be provided to each applicant with an award or declination letter. If recommended to receive a fellowship, you should be contacted no later than May 1, 2013 and should subsequently receive your official notification of award in the late summer of 2013, for the fall term. Please note that this schedule may be changed without notification due to factors that were not anticipated at the time of announcement. The earliest anticipated start date for these awards is September 1, 2013."