A tank farm to contain four oil storage tanks was proposed for an area lying close to the Abonnema Wharf in Port Harcourt, Nigeria. The intended tanks would be 25.0m diameter and 13.5m high. For a tank diameter of 25.0m, two boreholes to depth of 30.0m and three cone penetration tests with pore pressure measurements were considered adequate for the subsurface investigation. The subsurface investigation in the tank site disclosed that the upper portion of the soil deposits in the area is composed essentially of Coastal Plain Sands sediments with few intrusions of Mangrove Swamp soils. Beneath the upper clayey deposits is a prevalent deposit of sands. The Coastal Plain Sands formation is composed of sandy, clayey sediments which have been laterized through the leaching of silica and the concentration of alumina and iron. The laterization is generally enhanced by tropical weathering and where the sediments are sufficiently dry, the weathering process produces iron oxide as cementing agent in the soil profile causing the soil to be brown or reddish brown. The project area is characterized by a thick layer of this soil. From the analyses of the results of the laboratory tests, high total and differential settlement of the tanks would be expected if the existing ground was not treated. Ground improvement techniques such as replacement of the weak soils with competent soils, preloading of the tank area with a surcharge and controlled loading of the tank foundation during water testing were considered. Evaluation of the feasibility of adopting pad or concrete ring or concrete raft foundation for the tanks was also carried out. In this paper, is presented the ground improvement technique adopted, the foundation type selected, the bearing capacity and settlement analyses and the results of the water testing of the tanks.