After massive amounts of foam were accumulated in the tank, the city corporation deputed local experts and a two-member team from IISc had inspected the tank as well as the approach canal.
While Chheda was fined Rs 3.16 crore for the delays, investigations revealed that the civic officials should have collected another Rs 6 crore as a penalty from him, the official said.
The park, which will be set up on 112 cents of land near Palayam Connemara Market opposite Martyrs Column, is expected to provide much-needed breathing space for the public.
Meanwhile, Health Minister Ma Subramanian said there are adequate oxygen masks at the hospital.
He said a report has been sought and the government will take appropriate action after the submission of the report.
The full area being searched was twice the size of the U.S. state of Connecticut in waters as deep as 13,200 feet (4,020 meters).
The drain accounts for around 70 per cent of the wastewater being discharged into the Yamuna.
Earlier report unsatisfactory; Those responsible not made accountable
The other 12 are going from one government office to another seeking compensation, disputing the claims of officers that their family members did not die of Covid.