20.4 million LVL worth depuration project of the goudron (residual oil, sulphuric acid tar) pond in Incukalns, Latvia will begin in spring 2012. Area of the created contamination is approximately 130 ha. The entrance of the contaminants in river Gauja can begin approximately after 25 - 30 years. A great risk of polluting the ground-waters. One of the most polluted places in Latvia