What to Expect When Developing an EIS Content Plan 
As federal priorities change, federal agencies perform more or different activities or subcontract activities to the private sector. The National Environmental Policy Act (NEPA) requires that these agencies analyze the impact of proposed activities on the environment and disclose this analysis in an Environmental Impact Statement (EIS). The EIS discloses to the public and to decisionmakers the environmental gains and loses from the proposed activity. Because the analysis is comprehensive and disclosure requirements are specifically prescribed by NEPA, technical experts from multiple disciplines write the EIS. To assist these specialty authors in producing an effective and successful EIS, an EIS content plan is mandatory.
Daus-Weber, Theresa. STC Proceedings (1998). Articles>Writing>Environmental>Technical Writing