Abstract <p>Different degrees of soil contamination have been generated by oil spills and leaks from storage tanks in refineries and processing facilities, as well as by the on-and-off loading of oil in different depots. In addition to the careless disposal of spent goods (engine oil) on the ground, this also causes environmental degradation of the soil. In the present study, the effect of contamination of sandy soil by gasoline under circular footing was studied. The circular footing is supported by sandy soil that has been polluted with gasoline by mixing the sand with different percent by dry weight with gasoline (10, 15, and 20%). The contaminated soil is extended to a depth of D/2 and D (where D is the footing diameter). The findings revealed that if the underlying sand is polluted with gasoline, the carrying capacity of the foundation reduces notably. The decline in bearing capacity was found to be 65.6, 59.4, and 51.3% for the sand’s percentages of contamination (10, 15, and 20%), respectively, at the depth of contamination D/2. The reduction in carrying capacity had been discovered to be 70, 78.7, and 33.1% for the depth of contamination D and for the percentages of contamination in the used sand 10, 15, and 20%. respectively. When the depth of contamination is raised from D/2 to D, the carrying capacity decreases by roughly 5–20% for the same percentage of pollution.</p>