Attachment J - Sewage Treatment Assessment

would most likely have the buffering capacity to managed higher than average flows, with the pump timing set
to ensure that daily irrigation does not exceed the irrigation area capacity.
Recent evaluation indicates that the system is managing the current flows adequately.

Proposed Expansion and STP and Land Application Area Requirements


Expansion Details
The proposed new accommodation and facilities are located adjacent to the existing and consist of a new
office and off compound meditation hall, a mini hall, two server accommodation blocks, a teacher
accommodation bock, 20 guest accommodation blocks, and two small ablution blocks (refer to Attachment
B). The expansion will increase the guest and staff maximum population from 52 to 129. The Vipassana
Centre Queensland Ltd has indicated that the as part of the expansion a new STP will be installed to service
the existing and new facilities.
Assessment of Sewage Treatment Plant Capacity
The proposed new STP is proposed to be a modular system that can be expanded in accordance with the
staged construction of the Centres proposed development. It is anticipated that additional land will be required
for the disposal of recycled water.
Land Application Area Suitability
A soil investigation was conducted by 19th November 2019 to confirm the soils present on site and the
suitability for future surface irrigation. The investigation found that soils generally comprised gravelly clay from
the surface to 400mm below ground level (bgl), overlying medium to high plasticity orange – brown with traces
of fine to coarse gravel. Test Site 1 was drilled to a maximum depth of 3.1m bgl and Test Site 2 to 2.0m bgl.
Neither test sites intersected groundwater. With reference to AS/ANZ 1547:2012 the soils on site typically
comprise a Category 6 soil type. The soil type on Lot 6 for effluent disposal are suitable with design
considerations. Bore logs and locations of the test sites are available as Attachment C.
Hydraulic Loading
To determine an appropriate hydraulic loading for the design of the new STP and land application area,
consideration has been given to the typical domestic wastewater flows described in:
    ▪      Chapter 5: Table A of the Planning Guidelines for Water Supply and Sewage 2010; and
    ▪      Table H4 of Australian / New Zealand Standard 1547:2012 On-site Domestic Wastewater
           Management.
The typical waste water flows from this guidance from similar development types is summarised in Table 1
below.




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