Tons of arsenic and other chemicals are believed still to be in the ground that the Arena is being built on according to reports from those involved in the contrstruction of the 32,000 seater stadium.
The land at Foleshill was fomerly the site of a gas works which fell into disrepair before being knocked down to make way for the Arena plus the Tescos superstore.
Users of the stadium are believed not to be at risk from the arsenic and other chemicals.