The proposed stadium site for planned Major League Soccer (MLS) franchise Inter Miami is badly contaminated, according to an environmental report.
The site has arsenic contamination levels more than twice the legal limit, the report by environmental firm EE&G said.
Barium and lead levels also exceeded legal limits at the site, which used to be a waste site for incinerator ash.
Plans are in place to build a stadium, shopping mall, hotel and public park on the site as part of a $1bn development.
Miami Mayor Francis Suarez said:
This obviously causes great concerns. Basically, the site has significantly more contamination than is commercially reasonable.
A spokesperson for Inter Miami said:
Miami Freedom Park has continued to move forward with the various studies needed for the redevelopment of the site.
Our legal team and engineers have been meeting with city commissioners and staff about the environmental report our consultants conducted on the city’s land.
We will be working with the city to implement a remediation plan that is thorough, and provides residents and visitors a destination that is safe for all to enjoy.
Inter Miami are set to join the MLS in 2020 as a new franchise and will initially play in an 18,000-seat arena in Fort Lauderdale.