It includes preliminary engineering, environmental impact analysis, and final engineering.

Last month, state and city officials chose a consultant for preliminary engineering and environmental analysis.

Do not start the final stage of design until the preliminary engineering is complete.

The City completed preliminary engineering on this project in 2010, however there is no budget or timeline for design and construction.

He said that based on preliminary engineering, the authority had budgeted $320 million for the tunnel work.

This included preliminary engineering, environmental impact analysis, and final engineering.

Funds are requested for continued preliminary engineering and design work now underway.

The preliminary engineering and evaluation design work were done in spring 2007.

Environmental review and preliminary engineering were expected to be completed by the end of 2008.

As of summer 2011, the Red Line has received federal permission to enter preliminary engineering.