Currently due to close at the end of the year, Sita predicts there will be a 120,000 tonnes shortage in the amount of waste. If the site closes without reaching its full capacity it could cause problems on long-term maintenance and drainage of the site.
Sita are hoping to delay the closure of the site until June 2011.
Sita UK planning manager Annemarie Wilshaw said the shortfall had arisen because the landfill site was scheduled to open in December 2004 with a five-year life span but it did not actually open until May 2006 15 months later. The delay came about because of a lengthy planning application.
The company has given assurances that there are no plans to extend the size of the current site or increase the amount of waste currently being buried.
If approved, the extra time would enable the company to completely fill this 120,000 tonnes void.