Castle completed a $1.9 million scope for earthwork and site utilities for the construction of the $90 million, 90,000-square-foot visitor center at the Missouri Botanical Gardens in St. Louis, MO. The LEED Gold facility expands the prior footprint by more than 30 percent to better support the more than 1 million yearly visitors. Castle performed work in multiple phases to support the general contractor and their plan to keep part of the visitor center safely open at all times, as well as perform work with deference to the sensitivity of botanical life adjacent to construction areas.