NOTICE OF AVAILABILITY OF A FINAL ENVIRONMENTAL ASSESSMENT AND FINDING OF NO SIGNIFICANT IMPACT FOR PROPOSED AIRPORT IMPROVEMENTS AT THE ST. CLAIR COUNTY INTERNATIONAL AIRPORT PORT HURON, MICHIGAN The St. Clair County International Airport (Airport or PHN) has completed final environmental documentation to address the proposed obstruction clearing in the approaches of Runway 4/22. To enhance safety and utility of the Airport for current and future users, PHN proposes to eliminate obstructions (trees) located off the ends of Runway 4/22. The proposed project is needed to provide unobstructed approaches to Runway 4/22 to meet Federal Aviation Administration and Michigan Department of Transportation Office of Aeronautics design standards for clear and unobstructed airspace. The Airport's proposed project includes the following components: Removal of approximately 86 acres of forested land located in the Runway 4/22 approaches for current and future obstructions. Acquisition of avigation easements over 21 private parcels to allow for current and future obstruction removals in the Runway 4/22 approaches. All interested persons are hereby notified of the availability of a Final Environmental Assessment (EA) and Finding of No Significant Impact (FONSI). These documents evaluated the potential impacts of the proposed improvements as required by the National Environmental Policy Act of 1969. Approval of the Final EA and FONSI by the Michigan Department of Transportation Office of Aeronautics means that the project can now proceed to final design, permitting, and construction. A hardcopy of the Final EA and FONSI is available for review during normal business hours at the Airport and an electronic version is also available anytime online on the Airport's website until June 26, 2026. Documents can be found at the following locations: A hardcopy is available at the Airport located at 275 Airport Drive, Kimball, MI 48074 An electronic version is available online at: https://www.stclaircounty.org/Offices/979?preview=true# Direct written or email questions to: Catie Fiore Airport Director St. Clair County International Airport 275 Airport Drive Kimball, MI 48074 cfiore@stclaircounty.org May 24 2026 LPET0520316