Driven piles are a common tool in any engineer’s toolbox for supporting large structures oververy soft ground, especially in high seismic risk zones. Challenges include achieving sufficientvertical and lateral load capacities within the constraints of pile spacing and geologic conditions.This was the case for a project in Orange County, California with a state-of-the-art, $180 millionplant for biosolids processing, biogas management and energy recovery located in marshlandnext to an existing waste water treatment plant. The new construction for the Irvine RanchWater District included a 70-foot (21 m) tall building and three closely spaced, 90-foot (27 m)high, 65-foot (20 m) diameter, egg-shaped steel digester tanks. The lower 35-feet (11 m) of thetanks were constructed below ground level.
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