Part of a large estuary along the eastern Australian coastline (Port Stephens, NSW) used for shellfish production was closed to harvesting for over 18 months as human viruses were found in oyster tissue. Domestic wastewater systems were considered an important source of the contaminants recorded in the estuary. The local regulatory authmity (Pmi Stephens Council) required that appropriately sized sand mounds be constructed at sites where systems had been assessed as failing and also at new housing sites with severe land capability constraints due to the high groundwater levels. Two of the sand mound systems were monitored in detail since midway through 2007 tor a pe1iod of six months using a variety of soil water samplers and groundwater bores. Only some of the monitoring results are presented in this paper, but on the basis of these results, it is clear that the two sand mounds are performing effectively as a treatment system resulting in significantly reduced contaminant concentrations entering the groundwater (Whitehead and Geary 2008). There is substantial interest in the overall pertonnance ofthese systems as little research has been conducted on wastewater treatment using sand mounds.
New Zealand Land Treatment Collective 2009 Annual Conference: Recycling of Water. New Zealand Land Treatment Collective Proceedings for the 2009 Annual Conference: Recycling of Water (Taupo, New Zealand 25-27 March, 2009) p. 151-157