(Trent Nelson | The Salt Lake Tribune) Yellow tape surrounds the Fairmont Park Pond in Salt Lake City on Thursday, Sept. 9, 2021. Testing has revealed the potential presence of mercury.(Trent Nelson | The Salt Lake Tribune) Yellow tape surrounds the Fairmont Park Pond in Salt Lake City on Thursday, Sept. 9, 2021. Testing has revealed the potential presence of mercury.(Trent Nelson | The Salt Lake Tribune) Yellow tape surrounds the Fairmont Park Pond in Salt Lake City on Thursday, Sept. 9, 2021. Testing has revealed the potential presence of mercury.