That was the initial assessment completed in July of last year, but further environmental study was deemed required: http://bigstory.ap.org/article/87381a7d1abd4817a8991b0c8caea... "An assessment conducted last year determined the crossing would not have a significant impact on the environment. However, then-Assistant Army Secretary for Civil Works Jo-Ellen Darcy on Dec. 4 declined to issue permission for the crossing, saying a broader environmental study was warranted."