The subject of the exploratory work and subsequent risk analysis is to obtain information for assessing the extent of pollution in the area of the former oil products refinery on the plots 2051/2, 2041/2, 2041/1 and 4197 in k.ú. Based on the evaluation of the survey work carried out, the risk analysis will assess the spread of pollution from the reservoir area to the surface flow of the river Sázava.