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El Granada Water Tank Seismic Assessment

El Granada, CA

Cornerstone prepared a Structural Review and Retrofit Strategy Report for an existing welded steel water storage tank at the El Granada Tank No. 1 site in Coastside County Water District. The existing tank is approximately 24 feet tall, with a diameter of 38 feet for a total storage capacity of 0.2 million gallons. This conditional and seismic assessment included multiple site visits, assessment of existing corrosion and paint, calculations in accordance with AWWA D100-11 design code, documenting potential areas of concern, potential retrofit options and recommendations, and proposal of lowering the normal operating level with seismic strengthening and addressing conditional issues and repainting. Cornerstone worked closely with Coastside County Water District to obtain available documentation and consulted a tank manufacturer to determine potential retrofit strategies. The final report also included various retrofit sketches and construction cost estimates which were vetted by a tank manufacturer.

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