Eurobodalla Integrated Water Cycle Management Strategy

Eurobodalla Integrated Water Cycle Management Strategy
wastewater pumpout. The remaining systems utilise aerated processes that give higher
levels of nutrient removal than septic systems.
Figure 9-9 Aerial Photograph of Rosedale and Guerilla Bay Showing Their Proximity
to Tomakin and Mossy Point
9.6.2 What Are The Issues
The issues associated with the Rosedale and Guerilla Bay landscape and water
management system are classified into environmental and social issues, and are discussed
below. Other community services-related issues are not part of this study.
Environmental Issues
The soils in the Guerilla Bay and Rosedale area are generally unsuitable for
controlled absorption (soils range from sandy, hard gravel and clay). It is therefore
commonly acknowledged that sewage/wastewater from on-site wastewater
management systems will infiltrate into the groundwater aquifer and ultimately end
up in the waterways. This could be particularly detrimental due to the presence of
two sensitive lagoons in the area.
Stormwater entering the lagoon from the developed areas has the potential to
impact upon the health and visual quality of the lagoon. The likely pollutants are
hydrocarbons from the roads, litter particularly from the identified hot spots (e.g.
carparks) nutrients and particles associated with the sediments. In the absence of
stormwater quantity and quality monitoring, preliminary estimates suggest an
annual nutrient load of 795 kL with nitrogen and phosphorus loads of 1 000 kg and
100 kg respectively.
The two intermittently opening lagoons can become odorous when closed. This
may be due to the decomposition of seaweed washed in during high storms or
pollution from the urban areas.
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