(Portland, OR) -- More than 600 City of Portland workers plan to strike on Thursday. The City and the union have failed to reach agreement on a new contract after 10 months of negotiations. The strike will affect the Bureau of Transportation, Parks & Recreation, Bureau of Environmental Services and fleet and vehicle workers. The City offered a 12-percent wage increase with half of it retroactive to last year, plus a five-percent cost of living increase. The union wants the five-percent cap on cost-of-living increases to be removed. Mayor Ted Wheeler issued an emergency declaration which allows the city to hire contractors to continue essential city services.