When the Draft Environmental Assessment (EA) is complete, preparation of a Final EA will begin. The Final EA and the subsequent Record of Decision will commit the project to a range of actions and physical elements that mitigate its negative impacts.
Project Development will proceed along with preparation of the Final EA, furthering engineering, making design decisions, and defining the physical elements of the project more and more specifically. When Project Development is complete, engineers will further design the transitway to create construction documents that a contractor can use to build it. The design and construction of the transitway will incorporate all of the mitigation measures specified in the Final EA and Record of Decision.
A more detailed description of the Federal Transit Administration New Starts process can be found here. http://www.fta.dot.gov/12304_2608.html