ATM assisted CertainTeed Gypsum with improving the transportation of bulk gypsum from deep-draft ships to their existing marine terminal, constructed in 1962, and a berth which had not been maintained for more than a decade. Because of the lack of maintenance, the effective depth of the berth had decreased to -20 feet MLW from a permitted depth of -32 feet MLW. An initial evaluation of alternatives by ATM considered several terminal options for the unloading of bulk gypsum such as deepening the existing berth, construction of a new berth or trucking from a nearby terminal facility. The preferred option included construction of a new deep berth along the navigation channel, along with new marine dock structures and cargo handling equipment.
ATM performed hydrodynamic and sedimentation modeling to identify the best berth alignment to minimize sedimentation and maintenance dredging costs and developed budget estimates for capital and maintenance dredging costs for the preferred option.