Riviera Beach is expected Tuesday to select one of the three teams vying to design and build a new water treatment plant for the city that could cost as much as $150 million. Federal, state and city money is expected to pay for the new plant. The city is in the midst of a building boom that includes new municipal offices, new fire stations and new facilities for other government services. But city officials have said no project in recent history is more important than replacing the city’s water treatment plant, which was completed in 1958.