Project commitments are identified and made throughout the project development process. Commitments can be related to design (e.g. storm water detention basins or sidewalks) or environmental (e.g., stream mitigation or realignment, wetland mitigation, or cemetery protection measures) concerns, or be in response to issues/opportunities raised during the public involvement process. Each commitment should be reviewed by the Interdisciplinary Project Planning Team (IPPT) to evaluate its impact on other planning, design, and/or construction functions and tracked through TDOT's Commitments Tracking Database.
During the NEPA process, environmental commitments are often made to avoid, minimize, or mitigate project impacts. Commitments result from public comment or through the requirements of, or agreements with, resource agencies and it is important that these commitments be reviewed by the IPPT, tracked, and carried forward through the project design, construction, and maintenance and operation phases. This chapter identifies the process by which environmental commitments are carried forward from the NEPA process into project design, construction, maintenance and operation. The three basic types of commitments (avoidance, minimization, and mitigation) are identified, as are the responsibilities for relating the commitments to other TDOT divisions. The chapter also explains some of the types of commitments made for impacts to cultural and ecological resources, noise impacts, and hazardous materials.
All environmental commitments must be listed on green paper just after the summary at the front of the environmental document, where they are clearly visible to all readers.