Dug drainage ditch at the hangar entrance, north side. Installed permeable fabric in ditch. Installed perforated flexible pipe in ditch. Covered pipe with pea gravel from hangar floor. Covered gravel with walkway grate, ballasted with additional gravel on front north hangar entrance.
Cut T1-11 panels to 4' x 42" for hangar entrance above door. Hung one panel. Welded/screwed panel pieces on south wall to cover crash damaged area cuts.