NAVFAC Repair Water Tank 1021

Kelsey Structural performed the structural condition assessment, structural and seismic analysis and rehabilitation design of the existing Coronado Water Tank 1021 at Naval Base Coronado, CA for NAVFAC.  The structural condition assessment consisted of a visual observation of the tank exterior and interior as viewed from the roof hatch as the tank could not be taken out of service for interior inspections.  Moderate to severe deterioration of the tank coating systems and roof structure were identified.  Structural and seismic analysis determined critical deficiencies of both inadequate freeboard and insufficient anchorage to the foundation.  A technical memorandum was developed summarizing these findings with repair recommendations provided to remove and replace the existing roof with additional freeboard provided and an optional item of retrofitting the tank foundation and anchorage to meet current code compliance.  The project progressed to the design and construction stage where the existing roof was removed and replaced with a modern steel roof system and knuckle shell connection which provided adequate freeboard for the tank with new interior and exterior coatings applied in addition to a new cathodic protection system capable of mitigating future corrosion.  Additional safety features such as a new interior ladder, new roof platform, handrailing and roof tie-offs were also provided.