Geotechnical investigations of subsoil were carried out in parts of Oleh community, Delta State, Southern Nigeria in order to delineate subsoil engineering properties, as well as evaluate the type of foundation that will be most suitable for the area. A total of ten (10) subsoil samples, obtained from two (2) depths (4 m and 8 m) were used to determine the specific gravity, Atterberg limits and particle size of the subsoil. The findings revealed that the specific gravity of the soil samples ranged between 2.52 and 2.85; and the specific gravity of the soil obtained at the 4 m depth was higher, when compared to the soil obtained at the 8 m depth. Additionally, the liquid limits of the soil samples ranged between 25% and 42%; the soils samples plastic limit varied between 13% and 25%; soils samples plastic index ranged from 5% to 17%; and the liquid limit, plastic limits and plastic index of the soil samples obtained at the depth of 4 m, were generally higher than the soil samples obtained at the depth of 8 m. The findings of the particle grain size grading revealed that the study area consists of silt loam, loamy sand and sandy and soils. Data obtained from this study will be useful for geotechnical purposes and these results will benefit to engineers or decision makers in designing building foundation within the study region