The Goldman Sachs project, then known as Battery Park Site 26, was built on an approximately 70,000 square foot footprint. Laquila started the project off by installing 50′ lengths of interlocking steel sheeting around the perimeter, utilizing their American A100 HC 100 Ton crawler crane and a vibratory hammer. Sheeting along east side of the property was installed directly in front of an historic bulkhead, which at one time delineated the western shoreline of lower Manhattan.
After an initial excavation cut, Laquila demobilized off the site to make way for the caisson contractor, who was brought in under a separate contract. After the caisson contractor finished installing approximately 180 large diameter caissons, Laquila remobilized and rapidly excavated the site to the final subgrade, approximately 30′ below street elevation. The site was kept dry by the continuous operation of eight deep wells. Laquila installed a 4′ thick, fully waterproofed foundation mat atop the caissons, installed a complex waler and raker system to brace the sheeting against poured sections of foundation mat, and then completed the pouring of the 4′ thick perimeter mat.
The final step was to construct the fully waterproofed foundation walls, utilizing a number of hydraulic cranes, a modular gang form system, and concrete pumps and conveyors to place the concrete. With the foundation completed, the construction manager was able to bring in their steel erector ahead of schedule to construct the tower that would become the World Headquarters for Goldman Sachs.