Initial Expansion of Groundwater Replenishment System

STI/SPFA 2014 Tank of the Year

Product / project title: Initial Expansion of the Groundwater Replenishment System – (2) 7.9 MG Equalization Tanks
Product / project owner: Orange County Water District
Product / project location: Fountain Hills, CA
Date completed: October 2014
Construction standard (if any): D100-05
Overall height / length (feet, inches): 32’ -0”
Column height (feet, inches): –
Diameter (feet, inches): 216’ -0”
Capacity (US gallons): 15,800,000 (7.9M each)
Steel tonnage used (US tons): 1,380
Steel thickness (inches): 3/16 to 0.656”
Product/Project Description:
Project scope included provided engineering, fabrication, erection and coating of two (2) 7.9 million gallon welded steel reservoirs. Foundation design for each tank required 449 concrete piles 60 to 65 feet deep, due to ground soil having extremely high liquefaction potential during a seismic event.
The project takes highly treated wastewater and purifies it through a three-step process that includes micro-filtration, reverse osmosis and ultraviolet light with hydrogen peroxide and then uses it to recharge the groundwater basin.  It is the world’s largest advanced water purification facility of its kind prior to this expansion project, producing up to 70 million gallons of new water every day.
Each tank is 216 ft. diameter x 32 ft. shell height with a three bay roof structure.  Construction of the two tanks utilized over 1,380 tons of steel.  Both tanks were shop blasted and primed prior to field application of high performance 100% solids coating system on the full interior.  It is estimated that the life-cycle of the tank coatings is 50 years.

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