The special environment in Hawaii produces some tropical soils which often have poor engineering properties including high swelling potential, high plasticity, low strength, etc. On the island of Oahu, municipal solid waste (MSW) is incinerated to reduce the total volume for landfill conservation while generating electricity to supplement the islands energy needs. Productive use of these wastes, together with locally available lime and/or cement, are being considered as possible admixtures to stabilize those undesirable soils. Utilization of this waste ash could have significant environmental benefits and result in considerable cost savings, while providing a low cost stabilizer for geotechnical applications.