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The mystery over the shocking wet weather playing surface at Allianz Stadium has finally been solved after a month-long investigation by engineers and global turf experts.
Comprehensive tests on the grass and drainage uncovered soil and sand contamination issues from when the ground surface was first laid four years ago while the stadium was still under construction.
A repair job to replace the entire playing surface base and grass is expected to cost $6 million, although building insurance is likely to cover the expense rather than taxpayers.
The stadium has its heaviest load this weekend with the Roosters v Bulldogs, Rabbitohs v Eels, Wests Tigers v Manly and St George Illawarra v the Wests Tigers in the NRLW.
The surface at the $870 million venue will be ripped up and removed after the Wallabies v Argentina Test match on September 13 and the stadium closed down for 10 weeks.
The report found that water on the ground during heavy downpours was draining at only 40 millimetres per hour — just a tenth of the amount that it should be.
Acceptable drainage at major sporting venues is normally between 300 and 600 millimetres per hour.
The turf experts found the issue at Allianz was caused by having nine per cent of clay in the earth layer below the stadium turf.
The maximum level — according to turf experts — should be two per cent; hence the draining blockage and water not getting out through the underground pipes.
“The review further found that when the original sand was purchased and stockpiled it was tested using a method that was not aligned with the project brief,” said a government source.
NSW Minister for Sport Steve Kamper and Venues NSW chairman David Gallop were handed the report last week.
Both Venues NSW and the NSW Government have been clear from the start that the quality of the surface has not been up to our standards,” Mr Kamper said. “I am glad that we now have a path forward to rectify this matter.
“I want to thank the groundskeepers and Venues team who have been working tirelessly to make this ground workable, under what we now know, were impossible conditions.”
Gallop and his senior stadium staff had been under pressure for weeks to fix the problem.
“Venues NSW remains committed to delivering world-class facilities and experiences for athletes, fans, and event partners,” he said.
“The remediation works will ensure Allianz Stadium continues to meet the highest standards of performance and safety.”
The stadium will be reopened for three concerts — Kendrick Lamar on December 10/11 and Dom Dolla on December 20.
Sydney FC will return in mid-January for A League games.
Their first eight matches of the season have been moved to other venues.