Residents say a rezoning proposal to allow dozens of extra houses to be built at Terrie Avenue, Figtree would create a series of issues.
The community also has a last chance to have a say on the proposal.
The 14-hectare site is currently zoned E4 Environmental Living.
The property owner seeks to rezone much of it to R2 Low Density Residential.
They have approval for an extra 40 lots, but with a change in zoning could potentially reduce the size of the lots and therefore this number could increase.
Wollongong councillor Cath Blakey said she had been contacted by many residents concerned about the proposal to "almost double the number of houses there".
Residents' concerns include traffic congestion, encroachment on the escarpment, biodiversity loss, slip, bushfire risk and increased stormwater runoff.
Nearby resident Paul Wright had made a submission on the matter, and encouraged others to do the same.
"Both the changing of the zoning, and the scope that they're intending through this proposal is a concern to people," he said.
"I think most people understand or accept there is going to be some development there, but it falls under the E4 zoning. Therefore the council retains some control of how to manage that development responsibly.
"But by changing it to the R2 Residential, the council will lose a fair bit of that control, and there will be a much higher density development there which will have a whole host of impacts."
He said council had been proactive in seeking community input.
According to the planning proposal, development consent for subdivision of the land was approved in 1990 and the subdivision was referred to as the Keira Glen Estate. To date, 61 of the approved 116 lots have been constructed.
However, following the first two stages of construction, Wollongong LEP 2009 was gazetted which removed the residential zoning which had previously applied to part of the remaining site to be subdivided.
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"The site is known to have a number of natural constraints," the document says.
"Site specific reports have now been prepared which demonstrate that a portion of the site remains capable of accommodating residential allotments."
The public exhibition period closes on Friday (June 5).
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