Environmental Field Studies & NEPA Documentation

MidAmerica Airport


Horner & Shifrin conducted and provided the summaries for a Waters of the U.S./Wetland Delineation, Floodplain Determination, and Phase I Environmental Site Assessment for a new development at MidAmerica Airport for Mascoutah, IL.

The scope of services involved conducting a Wetland and Waterbody Delineation to characterize the existing site conditions and determine the extent of wetlands and waterbodies that have the potential to be considered waters of the United States under the jurisdiction of the U.S. Army Corps of Engineers (USACE).  H&S services included a field exploration for wetlands and waterbodies and the preparation of a wetland delineation report. All field studies were summarized in individual detailed memos and included in the NEPA Environmental Assessment document being prepared for the site development. The Final EA and FONSI were approved by the FAA in 2021.



Project Components




St Clair County, Illinois

Year Completed


Innovation. Agility.
Reliability. Horner & Shifrin.