Skip Ribbon Commands
Skip to main content


Skip Navigation LinksRegional Transportation Plan > PEIR


Image: PEIR Environment Collage

What is the PEIR?

The Program Environmental Impact Report (PEIR) is an informational document that discloses the impacts of discretionary government actions (such as the RTP) on the environment.


The California Environmental Quality Act (CEQA) requires a Lead Agency to prepare an Environmental Impact Report (EIR) for any discretionary government actions, including programs and plans that may cause significant environmental effects. Therefore, SCAG is   required to prepare a Program Environmental Impact Report for the 2012 Regional Transportation Plan, including the Sustainable Communities Strategy. The PEIR will be a "first-tier" CEQA document designed to consider "broad policy alternatives and program-wide mitigation measures." (CEQA Guidelines ยง15168(b)(4) In addition, the PEIR will supply the foundation for the subsequent, project-specific environmental reviews that will be conducted by implementation agencies.

What will the PEIR Analyze?

The PEIR evaluates regional-scale environmental impacts direct and indirect effects, growth-inducing impacts, and cumulative impacts and identifies suggested mitigation measures to minimize the identified potentially significant adverse environmental impacts.

The impact categories listed below were identified for analysis in the 2012 RTP PEIR.

  • Aesthetics and Views
  • Air Quality
  • Biological Resources
  • Cultural Resources
  • Geology and Soils
  • Greenhouse Gases and Climate Change
  • Hazardous Materials
  • Land Use (including Open Space)
  • Noise
  • Population, Employment, and Housing
  • Public Services and Utilities (including Energy)
  • Transportation (including Security)
  • Water Resources