Attachment K - HSTP Design

The system shall have the ability to isolate the effluent from the sprinkler system to
enable servicing and maintenance requirements of the irrigation area. The method of
isolation cannot cause harm to the treatment plant operation (pump, electrical,
treatment). Manufacturer of the treatment plant is to approve the method of isolation.
Spray outlets are not permitted to operate when persons are required to enter the Land
Application Area (e.g. when being serviced and/or maintained).

There are obvious increased public health risks associated with effluent spray
irrigation systems due to the potential contact with effluent by humans, animals and
insects.

5.3 Planting Regime.

Plantings improve the efficiency of the system with the uptake of nutrient and natural
transpiration processes. Further qualified advice from local nurserymen and the local
regulatory authority should be preferred when choosing plants that may be more or
less suitable or acceptable to your region. Grasses should be kept well mown and
raked for better evaporative and transpiration processes (avoid throwing grass
clippings onto the Land Application Area). Shrubs should be kept well pruned for
better evaporative and transpiration processes.

Endemic vegetation must be retained and/or reinstated.

Following the site preparation, installation and pre-commissioning tests the Land
Application Area shall be allowed to revegetate with sufficient appropriate shallow
rooting grasses or shrubs, as determined by historical performance outcomes.

Unearthed Geotechnical P/L recommends further assessment regarding planting
requirements be sought prior to, or at the time of installation of the Land Application
Facility. It may be necessary to implement an additional planting regime.

Do not plant shrubs or trees within the surface water diversion drains, as these drains
need to be kept free of obstruction and debris for maximum diversion efficiency.

We recommend the application of dolomite at a nominal rate (say, 0.25 kg/sqm)
when preparing the existing soil. This will assist with both plant growth and/or pH
control. Further applications will be required during the serviceable life of the Land
Application Area.

 

Unearthed Geotechnical P/L. 10 Design Report 023-038