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USS Olympia Length 344 feet Beam 53 feet Draft Today 17 feet fwd 20.5 feet aft Displacement

USS Olympia Length 344 feet Beam 53 feet Draft Today 17 feet fwd 20.5 feet aft Displacement In service 5,600 tons Today 4,780 tons Stability Today GM 0.67’ 29 tons/inch immersion Crew 400 enlisted 40 officers Today 5 Speed 22 + knots Coal capacity

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USS Olympia Length 344 feet Beam 53 feet Draft Today 17 feet fwd 20.5 feet aft Displacement

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  1. USS Olympia Length 344 feet Beam 53 feet Draft Today 17 feet fwd 20.5 feet aft Displacement In service 5,600 tons Today 4,780 tons Stability Today GM 0.67’ 29 tons/inch immersion Crew 400 enlisted 40 officers Today 5 Speed 22 + knots Coal capacity 1100 tons Today Empty Cruising range 2,500 miles Armaments (4) 8” guns (mock-ups) (8) 5” guns (6) on loan, NHHC (10) 6-pounder guns Originally equipment 6 Auxiliary sails

  2. Over 15 years of Study • Robert C. Stewart: Historic American Engineering Record: USS Olympia, HAER PA 428 • NAVSEA, Inclining: simple stability test • Don Birkholtz Jr: drafted Cruiser Olympia; Historic Structure Report • Dr. Cooling: Olympia: Herald of Empire • ATC Environmental, comprehensive lead and asbestos evaluations and recommendations • Robert Jamieson, PE: single compartment floodability standard. Digitized over 300 construction drawings • Charles C. Deroko, oversaw bulkhead repairs, conducted hull survey, specifications for interim repairs. • Lawrence Burr, Us Cruisers 1883-1904

  3. Removed Inappropriate Displays

  4. Notable Preservation Projects • Museum’s boat shop replicated historic pilothouse later installed on the restored forward bridge deck • Restored multiple areas of ship and reopened to public, including Engine and Boiler rooms

  5. The Technical Challenges: Leaking exterior decks Watertight integrity of hull Extensive dredging requirements

  6. Exterior Deck • Multiple leaks • Structurally compromised • Wood deck dates from before the 1920’s • Concrete layer added by US Navy, 1945 • Polyurethane membrane added by Museum in 2003 to provide watertight integrity

  7. Olympia was last hauled in 1945. There are 72 patched holes in her hull to date. Chronic deck leaks contribute to decay of ship’s hull and interior.

  8. Removal of Olympia from Penn’s Landing basin to effect repairs

  9. Required for Olympia removal:Dredging 28,000 cu/yds of material

  10. Stabilization efforts • Removed over 30 tons of asbestos and other contaminates • Repaired bulkheads to establish single compartment floodability standard • Installed remote-monitored alarm system with 54 damage control sensors • Restored watertight integrity to inner bottom tank tops • Effected interim repairs to damaged areas of the hull in way of wind and waterline

  11. Interim Repairs Completed: Internal repairs of exterior hull over 15% of waterline area included 32 Welded steel cofferdams

  12. Cost Summary Fabrication and Installation of a 700’ X 3’ doubler Belt around the waterline of the USS Olympia • Materials and Consumables: $161,000.00 • Mobilization / Demobilization $40, 000.00 • Day Rate $15,000.00/day • @ 200 days $3,000,000.00 Note this is a rough estimate, there are potential savings in equipment rental, material costs. As well as improved production rate based on process improvement. 15

  13. Other options considered: • Secure ship in place with cofferdam and cement • Install double sheet pile wall around the ship and submarine • Dewater area • Effect repairs to exposed hull • Cement or backfill as needed • Note: • Without dredging and relocation of the Submarine Becuna, cofferdam would have to incorporate both Olympia and Becuna • Cement in this quantity is • non-reversible

  14. Cost $2.1 Million ++

  15. Hull Survey to determined realistic out of water repair costs

  16. The Road Forward:Most engineering and planning work is completed • Conducted stability tests and floodable length studies with US Navy and private contractors • Completed hull condition survey including over 1400 UT readings • Drafted tow and repair specifications • Reviewed docking plan with potential contractors Still required • Reballasting study, required for extended tow • Still water bending moment study,

  17. With proper preparations Olympia can be carefully towed to a local repair facility and properly supported she is capable of withstanding the spot loading of the dry dock blocking Summary of Findings: Olympia IS repairable

  18. Phase IHull Work Dredging: 6 weeks Tow Prep/Block and Prep Dock: 2 months Tow to dry dock #2 or #3 PNBC Haul Out: 3 months Hydroblast hull Install 4’X ½” belt at waterline (700 linear ft) Visual and UT inspection of entire wetted surface (minimum 3000 shots) Install additional plating where required up to 10% Sand sweep 3 coats type 235 primer (or alternative high build coating) Additional high build primer at waterline and on keel Launch Return tow

  19. Phase IIRedecking Build Waterproof containment over exterior decks Install interior containment to preserve historic fabric Remove and preserve historic fittings, including stacks, masts and ventilators Remove 7” of exterior coatings, including 70 tons of concrete and 3” original decking Repair and recoat steel substructure Install prefabricated Teak Deck Systems panels Reinstall historic fittings

  20. Cost of Olympia Preservation($000) PHASE I- Hull stabilization Dredging $ 1,000 Prep, tow, hull work, reballasting (for local tow) $ 4,800 Total $ 5,800 PHASE II- Redecking Exterior containment and deck removal $ 750 Interior containment and fitting removal $ 400 Steel work $ 400 Rehab and reinstallation of fittings $ 350 Teak Deck System estimate $ 1,500 Total $ 3,400 Envelope Rehabilitation Project Total $9.2 million

  21. interim repairs to delay inevitable dry docking and redecking

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