At least the next 80 years worth of the city's rubbish will be stored underground at the Gregadoo Waste Management Facility.
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Since the early 1980s, the site has been approved as Wagga's official landfill.
But, facility manager Geoff Pym is hopeful the landfill site's life will be extended beyond a century as the city continues to explore new ways to turn waste into reusable products.
"The less [rubbish] we have to fill it with, the more time we have on the land," Mr Pym said.
"So we're always looking to reduce our landfill by diverting the rubbish elsewhere."
Since the 2003 installation of a gas flare, the site's decomposing gasses have been filtered out of the landfill heaps.
The gasses are separated into usable carbon dioxide and water, which Mr Pym estimates has reduced the site's carbon footprint by 20 per cent over the past 16 years.
Last year, Wagga City Council purchased the flare from AGL, the company that installed it.
By January next year, Gregadoo will be able to begin expanding its underground pipe network across its land.
The more gasses that are funnelled and collected, the less end up in the atmosphere.
"If we can collect the gasses from new areas of landfill, we can prevent it from escaping into the atmosphere," Mr Pym said.
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A year ago, in November, the Wagga City Council conducted an audit of the city's kerbside collection bins.
Released earlier this year, the results showed a startling area of improvement, particularly in residential recycling.
The yellow-lidded bins had a contamination rate of up to 12 per cent.
But the city did well with its green-lidded 'FOGO'. Only two per cent of that was contaminated.
Tender is now open for another contractor to conduct a follow-up audit soon, and Mr Pym hopes this will indicate a dramatic reduction in contamination rates.
"Anecdotally, we've reduced compost [contamination] to about one or two per cent," Mr Pym said.
Green waste that is brought to the facility is shipped to Carathool to be used as composting.
So large are the shipments, that there are often two per day.
In the past five years, Gregadoo has acquired a number of new waste treatment tools.
The facility can now better manage everything from fridges, tyres, batteries, mattresses, e-waste, and most recently, cooking oils and polysterene foam.
A styrofoam extruder, purchase in 2014, compacts loose foam into a denser material that is almost 20 times as heavy as its original form.
This is then transported to Sydney and sold for reuse.
Earlier this year, the facility acquired a recycling drum for unused cooking oil.
"You empty containers [of oil] into the bins and once it's full, it gets transported to be reused as fuel," Mr Pym said.
"We haven't had to empty it yet, but I expect we will in the next month or so."
Additionally, a new cardboard crusher purchased by the facility has removed enormous amounts of paper material from landfill.
"All of that paper and cardboard gets sent down to Visy for reuse," Mr Pym said.
"We'd send about six semi loads every year of paper.
"Ideally, we want to reuse as much as possible and not be putting it into landfill."