A 500-metre exclusion zone will be enforced in Dublin Bay during the laying over the next eight weeks of a 10.5km pipeline, the latest phase in a £220 million upgrade of Dublin's waste water treatment facilities. The pipeline will channel sewage from a pumping station at Sutton to a secondary treatment facility at Ringsend. The project is expected to be completed in spring 2002. The Dublin Bay Project has warned sailors and other water users to observe the exclusion zone, which operates around all pipe-laying equipment.