Pittsburgh, Allegheny County and sewer authority officials said Thursday they want to put off plans to build tunnels that would keep billions of gallons of sewage out of the rivers until they exhaust other options.

Mayor Bill Peduto and county Executive Rich Fitzgerald asked the U.S. Environmental Protection Agency for a 10-year window to repair infrastructure and implement “green” projects such as rain barrels, porous pavement and vegetation-covered roofs to reduce water flowing to the county’s sewage treatment plant.

“Rather than rush in and build something that might not be the best expenditure of dollars, we want to make sure we’re doing it right,” Fitzgerald said Thursday.

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