By that time the smell of what was described as LPG had dissipated.
One crew had come across a small rubbish fire at one yard which was put out.
Magill said the damp conditions meant the gas would stay low in the air and not rise so quickly.
It would also have been driven away to the west by easterly winds at the time.
"Not the best of days to have a break outside," one man said as he and his colleagues waited it out in the rain.
"With gas we have to take all precautions," Magill said.
"It is not something you take risks with."
He said several business in the area used LPG as well as other gas agents but the building to building searches came up with nothing.
Some of the locals said they thought they had smelled gas even earlier in the morning.