Work is continuing to prevent a retaining wall collapsing at a housing development in Dromore, County Down.
Mr Collier told the court the wall was built as a garden wall and not a retaining wall.
The complex had a retaining wall which collapsed spreading dirt, rocks and other debris on the road below.
Engineers advised residents to move after a retaining wall at the back of the property was at risk of collapsing.
Three years ago, a retaining wall on the Bridge Valley Road, near the Portway, had to be repaired after it collapsed.
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Mr Collier told the trial during his evidence that the wall was built as a garden wall and not a retaining wall.
The ball caromed back onto the field off the bottom of a black retaining wall just above the fence and was initially ruled in play.
The four men died after the Gleision drift mine flooded on 15 September 2011 after a retaining wall holding back a body of water failed.
Mr Cox said the wall had not been constructed as a retaining wall, had not been designed as such and it collapsed moments after being backfilled.
Although the retaining wall held, restricting the damage to the warehouse, there is still much work required to remove saturated flooring and carpeting which is trapped under heavy shelves of food.
Judges or panels of judges decide most cases, providing a less sympathetic audience for tales of perhaps self-inflicted heartbreak (like potential knee blowout I risked by running straight into the retaining wall above).
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Works will consist of fully rebuilding the collapsed bridge's retaining wing wall, as well as taking down and rebuilding two other retaining wing walls which are showing significant signs of structural distress.
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