This paper introduces the ‘Smart Scoping for Environmental Investigations Technical Guide’ issued by the USEnvironmental Protection Agency in 2018, which describes the use of smart scoping during lifecycle of remedialinvestigation projects. This paper also briefly summarizes the guidelines of soil and groundwater contaminationinvestigation of South Korea. The smart scoping practices can support the development of a robust and realistic conceptualsite model that is very useful for investigations and evaluations of the contaminated site. The application of evaluationtools relevant for the site-specific characteristics is important for the development of a conceptual site model. The smartscoping recommends the use of previous investigation data and implementation of best proven strategies for successfulremedial investigation project. The use of smart scoping in contaminated site investigation will provide better managementof contaminated sites.