"It's a big hole and when there's a wet season any liquid material behind that bund wall can escape,"Mr Mewing said.
"Was it intentionally dug? On whose authority was it dug?"he said.
"It could be a real problem to find a buyer that would pay sufficient funds for it,"he said.
"Trace metals or heavy metals commonly co-occur in these soils."
"It [Lot 170] has turned out into one big acid factory … every time it rains after a period of dry, this area will be flooded with acid water."