In 2006 the Hutt region was found to be close to a self-contained waste catchment, with a high proportion of the waste generated in the region being disposed of at the region’s two landfills and with little waste from outside the region being disposed of at the region’s landfills.11 Within the region, Wainuiomata was, until recently, also self-contained, with little waste entering or leaving the area. However, with the establishment of Dimac’s transfer station in Seaview in 2007, where refuse collected in the Hutt region is aggregated for disposal at Wainuiomata landfill, both regions are no longer self-contained.
The results of the four surveys suggest that a substantial quantity of waste previously disposed of at Silverstream Landfill by one of the major waste operators is no longer being disposed of at there. Between the first and the fourth surveys the tonnage of waste carried by this waste operator decreased by over 20 per cent. It is not known if this waste is being transported to another facility for disposal, if it is being collected by another waste operator, or if waste generation in the Hutt region has declined.
Although Silverstream Landfill is still the primary disposal facility for the Hutt region, the surveys indicate that the facility may not receive a consistent subset of waste from the region, either in terms of quantity or types of waste. Without more detailed information regarding the trans-boundary movement of waste from the Hutt region and the quantities and types of waste being transported to Wainuiomata from Seaview, it can not be said with any certainty if waste being disposed of at Silverstream Landfill is, in other than general terms, representative of waste generated in the Hutt region.
11 Waste Not Consulting, Wellington “Waste Catchment Trial”, 2006, unpublished report prepared for the Ministry for the Environment.