A Tier 1 Environmental Impact Statement (EIS), which is part of a two-tiered process, will be prepared by MDTA and led by the Federal Highway Administration (FHWA). The two-tiered process provides a systematic approach for advancing potential transportation improvements. The regional analyses undertaken during Tier 1 will involve evaluation of approximately one-mile wide corridors using a broad-scale level of detail for engineering and environmental information. The Tier 1 EIS will result in selection of a corridor alternative that best meets the study purpose and need. Following the Tier 1 study, a Tier 2 study will identify specific alignment alternatives within the corridor alternative that is identified in Tier 1.
For more information on the NEPA process, please visit environment.fhwa.dot.gov/projdev/index.asp.