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In recent years, studies on the biopolymer effects on soil stabilization and improvement have been studied as a possible sustainable alternative. Previous studies have shown that the effects of biopolymer on soils have a substantial increase in both strength and reduction in surface erosion. However, all previous studies have been performed in the laboratory scale, and its performance on the field scale has yet to be verified. In this study, biopolymers were applied on a slope surface around the area of Seosan in the Rep. of Korea. The effects of biopolymers on the slope stability and erosion resistance were observed over a period of 4 months. In addition, the effects of the construction process and equipment were analyzed. The results from this field applications showed that the effects of biopolymers on the slope surface were beneficial, however, a more optimized construction process is necessary for better performance and reliability.