The Breen Group says combined parkland equal in size to Centennial Park will be the end result of the rehabilitation of its landfill site on the Kurnell peninsula.
However, the company is unable to say how long its Marang Parklands project will be delayed by a proposed application to increase the capacity of the former sandmining site and build a modern, new resource recovery facility.
Chief executive Damien Vella said Breen and Sutherland Shire Council were committed to delivering the community assets as soon as possible, but the proposal was subject to NSW Government planning approvals.
"We are working with the council to arrive at a delivery program," he said.
A council report said the proposal would delay the next stages of Marang Parklands, which are being developed under a 2010 voluntary planning agreement, but re-contouring of the site with higher levels could potentially result in a better outcome.
Mr Vella said, when the 91 hectare Marang Parklands were combined with the adjacent Charlotte Breen Memorial Park and Don Lucas Reserve, the total parkland area would be about the same as Centennial Park, 220 hectares.
"Visitors will enjoy unparalleled sweeping views of both the Pacific Ocean and Botany Bay," he said.
"It will be a magnificent asset not only for shire residents, but also for visitors from other parts of Sydney.
"Marang Parklands will include native parklands, walking trails, open public spaces, an amphitheatre, playing fields, a baseball facility, associated amenities and car parking.
"Major plantings of native Kurnell Dune Forest will form part of the restoration and support the Premier's priority to increase the tree canopy and green cover across Greater Sydney."
Mr Vella said Breen "has had a consistent vision for progressively rehabilitating its landholdings on the Kurnell Peninsula to include significant community focussed facilities that meet clear environmental and public outcomes".
"This focus has already resulted in the development of the residential estate Shearwater Landing and planning Marang Parklands.
"The first stage of Marang Parklands has been delivered and includes a skate park, two hockey fields for Hockey NSW and a fully serviced football field.
"There remains seven additional playing fields and the proposed public parkland, which will create an ecological 'green corridor' to the wetlands of Towra Point, Quibray Bay and Botany Bay."
Mr Vella said the revised plans "require additional soil to create the imaginatively landscaped contours and landform", and some of this soil had already been delivered and stockpiled.
"The soil required to meet these two requirements totals 1.9 million cubic metres," he said.
"The proposal seeks a total additional 38,000 cubic metres of construction-waste disposal capacity to be placed in landfill cells already constructed - which equates to less than a 0.5 per cent increase from the originally approved volumes for the site."
Mr Vella said the delivery of the remaining sporting facilities and parkland was dependent on obtaining consent to relocate the resource recovery infrastructure, which is located where the proposed new facilities and parkland will go.
"Breen is preparing a State Significant Development Application to go to the Department of Planning, Industry and Environment," he said.
"We are committed to working with the department, council and the community throughout this process, and will keep people updated," he said.
Mr Vella, said the proposed relocation of the waste recycling operations created an opportunity to redesign the facilities consistent with NSW EPA and recent federal government priorities and would be based on the latest resource recovery technologies.
"The new waste processing facility will satisfy the most stringent standards regarding noise, dust and other potential environmental impacts," he said.
"The new facility will be enclosed and located an additional one kilometre further east from the residential precinct of Greenhills Beach, compared to its current closer location."
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