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Paris is undertaking an Olympic-sized task of cleaning up the city's main waterway, the Seine River, ahead of the 2024 games. "We built some new construction to be able, for example, to catch the rainwater," said Pierre Rabadan, Paris' Deputy Mayor of Sport.New retention tanks are reducing runoff. The water quality is being constantly monitored."So that people know whether the water they're swimming game is safe or not," said Dan Angelsecu from Fluidion, a U.S.-based company involved in the monitoring process.Heavy rain and continued poor water quality have posed challenges to the cleanup efforts. Questions about safety are being raised as the Olympic marathon and triathlon competitions are set to take place in the river.City leaders insist the cleanup plan is working."30 years ago in the river Seine you have three kinds of fish. Now we have 32," Rabadan added.They are racing to finish the cleanup before the competition begins.The goal is to open the Seine to the public for swimming after the Olympics.