The project A 28-storey residential high-rise planned for construction on Miami Beach included a three-storey below-grade parking garage with an excavation footprint of 107,000 square ft. The challenge The 40-ft-deep basement excavation, adjacent to the ocean, was 34ft below sea level, posing the signicant challenge of controlling groundwater inow, especially with the native porous oolitic limestone. Oceana Bal HarbourThe solution We provided the client with an on-time turnkey solution which consisted of a deep large area excavation with design build excavation support, groundwater control and deep foundations. Hayward Baker solved the groundwater control challenge by using deep soil mixing to create a seepage barrier along the perimeter and base of the excavation. The perimeter soil mix

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