MONTPELIER (AP) - Top Vermont environmental officials are planning to brief the media on recent developments in the effort to clean up Lake Champlain.

Thursday's briefing comes nearly two months after the state Department of Environmental Conservation submitted its phase 1 plan to the Environmental Protection Agency for reducing phosphorus pollution in the lake.

The plan focuses on non-point sources of polluted runoff ranging from lawns and parking lots to farm fields, and says Vermont should not seek much pollution reduction through further reductions to sewage treatment plants.

Officials with the Department of Environmental Conservation say Vermont has made much progress in the last four decades in improving sewage treatment, and that to look for further incremental improvements would be too expensive.