The rehabilitation of each of the four tunnel ventilation buildings involved 100% hands-on investigation of all interior and exterior surfaces. Specialized rigging crews / rappelers investigated the interior of 33 exhaust and blower duct shafts. Work also encompasses restoration of the building envelopes and appurtenances; interior walls, floors, stairs and stairwells, catwalks, ladders, doors, hatchway gates, sound baffles, air vanes, handrails, bird screens, appurtenances, etc; building drainage systems; and identification of hazardous materials. SUPERSTRUCTURES provided investigation, design, and construction administration services.

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