THE Environment Protection Authority has ordered improvements to sediment control barriers to protect bush at the rear of the $90 million Hunter Medical Research Institute building at Rankin Park.
It follows concerns from bushwalkers who have complained about sediment and litter coming from the construction site over the past 12 months.
"It's gotten worse recently," regular bushwalker Robert Mitchell said. "The sediment has been running into the creek and now there is vegetation growing in the deposited sediment."
The Newcastle Herald inspected the site this week and found a partially collapsed sediment fence at the bottom of an exposed slope.
Styrofoam was scattered in the bush surrounding the site.
An Environment Protection Authority spokeswoman said the authority initially received a complaint about the site's condition on June 15, 2011.
New sediment controls were installed as a result of an inspection.
The spokeswoman said officers who inspected the area on Tuesday reported no visible sediment was leaving the site.
They organised for rubbish, which had blown from the site, to be cleared up.
"The [authority] instructed the contractor to grass some small patches of exposed earth and repair and maintain the existing sediment barriers in-place until the grass re-establishes," she said.