Planning

The National Environmental Policy Act of 1969 (NEPA) is a landmark piece of environmental legislation that requires the use of a systematic, interdisciplinary approach to evaluate the potential effects of federal actions on the environment. This process requires the preparation of an Environmental Assessment (EA) or an Environmental Impact Statement (EIS) to evaluate the effect of the proposed action on various aspects of the environment.

The interdisciplinary staff at Zambrana Engineering, Inc. (ZEI) has prepared numerous documents required by NEPA. Engineers, planners, and environmental staff work jointly to provide a balanced, integrated approach that results in the development of effective analyses and project solutions.

ZEI offers a wide range of interdisciplinary services to a variety of clients in the private and public sectors who are required to prepare NEPA documentation as part of the facility siting and permitting process. Such services include overall project management and the assessment of:

  • Water Quality
  • Wetlands and Floodplains
  • Threatened and Endangered Species
  • Ecological Communities
  • Wild and Scenic Rivers
  • Noise Impacts
  • Land Use
  • Environmental Justice
  • Demographic Analyses
  • Econometric Modeling
  • Parks and Recreation
  • Geological Resources


Agricultural Resources Examples of clients for whom these services are offered include:

  • U.S. Army Corps of Engineers
  • U.S. Federal Highway Administration
  • Missouri Department of Transportation
  • Illinois Department of Transportation
  • Hydroelectric Utilities
  • U.S. Postal Service
  • U.S. Forest Service
  • Federal Aviation Administration


ZEI has performed or provided input for various levels of documentation as part of the NEPA process. Examples include the following:

  • Draft Environmental Impact Statement (DEIS) for Lambert St. Louis International Airport
  • Environmental Impact Statement (EIS) for the I-35 to U.S. Route 65 Connector between Bethany and Trenton, Missouri
  • EIS for Routes 25, 34, and 72 near Cape Girardeau, Missouri
  • EIS for Route 13 between Richmond and Lexington, Missouri
  • EIS for Route 60 between Van Buren and Poplar Bluff, Missouri
  • Environmental Class of Action Determination (ECAD) for the Illinois Department of Transportation for Route 121 near Mt. Zion, Illinois
  • Environmental Assessment (EA) for the U.S. Postal Service facility in Kansas City
  • EIS for General Mitchell International Airport, Milwaukee, Wisconsin 
  • EA for Route 159 in Edwardsville, Illinois.

For more information contact Luis Ortiz at (314) 664-1900.