DRTO 241934 Restoration of Tortugas (Garden Key) Harbor Light

Project Description The historic Garden Key Harbor Light located on Fort Jefferson is structurally unstable and the lighthouse is likely to decline rapidly without immediate treatment. General maintenance and intermittent repairs performed in the 1930s, 1970s, 1990s, and 2000s have performed reasonably well and have allowed preservation of the structure for 140 years. Continued deterioration and shortening maintenance cycles indicate that the structure is on a downward course. The current level of deterioration, the failure of past repairs, and an interest to lengthen maintenance cycles all point towards comprehensive off-site treatment rather than limited in-situ repair. The proposed, Level II treatment involves dismantling the structure and moving it to an off-site facility for repair and rehabilitation. The level of work currently warranted cannot be adequately performed in situ. Dismantling the structure will allow for a more thorough evaluation of the material conditions and compatibility issues, and will result in more durable and long-lasting repairs. The structure will be disassembled and transported to a barge by a gantry system or crane. The intent is to remove each of the four tiers intact and remove only those components that prevent safe disassembly of the structure. Individual components of the structure will be dismantled off site, cleaned, and inspected for deterioration and damage. Removal of riveted components will likely involve drilling or burning out the rivets. Effort will be made to retain and repair original components, where possible, and to provide new replacement components that are compatible with the original in form and other defining characteristics. All original, repaired, and replacement components will be coated on all surfaces with a high-performance coating system. A Naval-grade marine coating system is being considered for increased durability. The structure will be reassembled on site and re-anchored to the existing masonry walls of Bastion 6.

Division 03 -	Concrete, Concrete Forming and Accessories, Cast-in-Place Concrete.
Division 04 -	Masonry, Unit Masonry.
Division 06 -	Wood, Plastics, and Composites, Rough Carpentry, Finish Carpentry, Millwork.
Division 07 -	Thermal and Moisture Protection, Dampproofing and Waterproofing, Thermal Protection, Weather Barriers.
Division 08 -	Openings, Doors and Frames, Entrances, Windows.
Division 09 -	Finishes, Plaster and Gypsum Board, Acoustical Ceilings, Flooring, Carpeting, Acoustic Treatment, Painting.
Division 12 -	Furnishings.
Division 21 -	Fire Suppression, Water-Based Fire-Suppression Systems, Fire-Extinguishing Systems.
Division 22 -	Plumbing, Instrumentation and Control for Plumbing, Plumbing Piping, Plumbing Equipment, Plumbing Fixtures, Drinking Fountains and Water Coolers.
Division 23 -	Heating, Ventilating, and Air Conditioning (HVAC), Instrumentation and Control for HVAC, HVAC Air Distribution, Central HVAC Equipment.
Division 26 -	Electrical, Power Distribution Units, Lighting, Interior Lighting, Emergency Lighting, Exit Signs, Exterior Lighting.
Division 27 -	Communications, Structured Cabling, Data Communications, Voice Communications.
Division 28 -	Electronic Safety and Security.
Division 31 -	Earthwork, Clearing and Grubbing, Grading, Soil Treatment.
Division 32 -	Exterior Improvements, Flexible Paving, Asphalt Paving, Rigid Paving, Concrete Paving, Curbs, Gutters, Sidewalks, and Driveways, Paving Specialties, Parking Bumpers, Pavement Markings, Fences and Gates, Irrigation, Planting.
Division 33 -	Utilities.