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This document is a Final Phase I Environmental Site Assessment for the Flight Research Building (Glenn Hangar) at NASA's Glenn Research Center in Cleveland, Ohio. The assessment was submitted by Leidos on April 26, 2024, under NASA Prime Contract No. 80GRC018C0022, Subcontract No. FA8-1-S1, Task Order E159. The document covers the environmental evaluation of the Flight Research Building located at the Glenn Research Center - Lewis Field, with the report prepared for NASA's Glenn Research Center at 21000 Brookpark Road in Cleveland, Ohio. Leidos, the submitting company, is located in Twinsburg, Ohio, and prepared this environmental site assessment as part of their contracted work for NASA.