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WPC was contracted to perform a geotechnical investigation for the replacement of the existing above-ground parking deck with a four-story underground parking garage and to restore Ellis Square, one of 18 original squares in the downtown historic district of Savannah, Georgia.
Construction plans called for excavation of the site down to approximately 45-feet below ground surface. A soil cement retaining wall was constructed in-situ, using a series of three, three-foot diameter augers drilled into the ground. The final product was a homogenous mixture of soil-cement, forming a continuous wall. The retaining wall was installed 90-feet below ground surface into a impervious sandy clay material that would limit groundwater from entering around the wall.
Due to the close proximity of fragile historic buildings, a comprehensive monitoring plan was adopted. The pre-condition survey involved documentation of existing conditions inside and outside of a total of 58 properties ranging from one story to seven story buildings. Data from all of the instruments was downloaded and analyzed on a regular basis to detect any potential damage to the surrounding structures.
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