As part of a major project in the US Virgin Islands to convert electric generating stations to Liquid Petroleum Gas (LPG), new storage terminals were built on St. Croix by VTTI, a subdivision of the Vitol Group, for the island’s Water and Power Authority (WAPA). US Wick Drain provided innovative ground improvement for the construction of two 20,345 square foot earthen containment mounds, each housing four new bullet tanks for LPG storage.  

The ground improvement phase of the project was scheduled to be completed in six weeks. To accommodate the heavy loads and address seismic concerns, US Wick Drain proposed separate techniques: Bi-Modulus Columns installed on the north pad and, due to the absence of the loose sand, Controlled Modulus Columns Rigid Inclusions on the south pad.  

Using these two ground improvement solutions, US Wick Drain’s design met the project settlement requirements of approximately two inches.