With the widespread of oil facilities, distribution centers of oil and oil tanks, it has become a must in this article to study the impact of these materials on the physical and mechanical properties of soils, especially at coast to avoid distortions and changes in the properties of these soils. We tried in this research to study Clay coastal soil. Two main samples were studied: one polluted with materials leaked from these sites and the other was not. The samples were taken from both types and transported to the laboratories of the Faculty of Civil Engineering at the University in October. In the laboratory, we conducted experiments and evaluated their results.