REMEDIATION OF PCB-CONTAMINATED SEDIMENTS IN LAKE JARNSJON, EMAN RIVER SYSTEM, SWEDEN

Jarnsjon, a lake in the Swedish river Eman contains approx 400 kg of P CB which is slowly leaching out from the sediments. An analysis progra m has shown that the Jarnsjon sediments are the primary source for ong oing discharge of PCB to the river. Based on the current yearly discha rge of 7 kg PCB, the sediments will cause problems during several deca des. The Eman river is classified as a resource of national importance . Remediation of Jarnsjon is necessary if continued damage is to be av oided. However, remedial activities in lake Jarnsjon can lead to an ad ditional load on Eman Restrictions on such releases during remediation of Jarnsjon will therefore be stringently applied. The feasibility of remediating Jarnsjon, has been examined in a number of studies carrie d out by the Swedish EPA together with different universities, institu tes and consulting companies. A primary alternative has been selected. This alternative includes vacuum dredging within a protective barrier of silt screens. Dredged material will be dewatered and disposed of i n a special landfill. This remedial action is estimated to cost appr. 40 million Swedish kronor. (6 - 8 million dollars). The remediation ha s started and will be concluded in 1994.