- Soil, Density, Limit, Pond, Permeability, Wastewater, Gravel, Atterbergs limit.
The proposed site of the wastewater treatment pond is located in a terrain inside the Polytechnic Campus and the New Staff Quarters where the storm-runoff flow has on effect. The site possesses good soil characteristics which include a particle size distribution of sandy soil with little fine particles of gravel, a specific gravity of 2.77 and a soil moisture content of 7.26% indicating a high degree of permeability. The output of geotechnical analysis indicated that the proposed site has soil particle density (ρs) and dry bulk density (ρb) of 1.76 g/cm3 and 1.64g/cm3 respectively. Void ratio (e), porosity (ȵ) values of 0.87 and 0.46 (46%) were determined. The atterbergs limits of 19.0%, 14.96% and 19.6% for shrinkage limit (SL), plastic limit (PL) and liquid limit (LL) were estimated with a computed plastic index (PI) of 3.04. The soil profile formation is highly sandy with a good lateritic layer to support the pond foundation. The proposed pond design volume (V) is 898.5 m3 and land areas of 718.8 m2 were estimated for the project.