Ellis Square Parking Garage
Location: Savannah, GA
Client: City of Savannah, Batson-Cook Company
Thomas & Hutton was retained to provide right of way surveys, existing condition surveys, and structural monitoring for the Ellis Square underground parking garage.
Right of way surveys of the square and the adjacent streets were required to clearly define the project limits and allow the planning of critical retaining structures and congested traffic flows. Existing conditions surveys were needed for design.
In addition to the normal challenges encountered in a crowded historic district, the survey team was tasked with locating and mapping all underground utilities. Ground penetrating radar and electromagnetic induction were used to locate more than 15,000 feet of active and abandoned utility lines within roughly a two block area. Designers used detailed 3-D models to carefully plan utility relocations and excavation strategies as they pieced together the complicated dig.
An excavation project of this magnitude posed structural risks to nearby buildings. Thomas & Hutton monitored ground movement during construction. For more than a year, our crews made precise measurements on six baselines watching for alterations around the project area. Data was carefully adjusted for environmental conditions, analyzed for integrity, and compared with control values. Cumulative weekly reports were subsequently generated and provided to structural engineers who then made important stabilization decisions based on the findings.