64 Pheasant Lane, Doonan septic design

1.0 Introduction:
Biowater Designs Pty Ltd, in accordance with AS/NZS1547-2012 ( Domestic Wastewater Management ) and the
Queensland Plumbing & Wastewater code (QPW) 2019 Version 1, was commissioned to undertake a Site & Soil
Evaluation in the Noosa Council at 64 Pheasant Lane, Doonan.

The results form the basis of our recommendations for on site wastewater disposal.

Original site investigation and field work was performed on Tuesday 17th September 2020 after a period of wet weather.

The investigation was undertaken to determine the soil profile and Long Term Acceptance Rate (LTAR) of the site in
order to accommodate a proposed new 4 bedroom dwelling.

NOTE: This evaluation was undertaken at the owner’s request after considerable discussion regarding environmental
issues of this site and preferred design of the Land Application Area.
.


2.0 Site Description:
2.1 Existing Buildings: None


2.2 Site Factors:

The site is an acreage allotment the area is 4000.37m2.

The proposed Land Application Area is moderately sloping (6%) to the North

The proposed Land Application Area will have good exposure to sun and wind following the planned removal of trees.

Erosion, mass movement or land slip was not observed on this site. Rock outcrops are not evident on this site.

Vegetation on this site currently consists of small to large trees.

There are no dams or bores on this site or adjoining properties within the required setbacks of the proposed Advanced
Enviro-Septic Bed.

There is a small creek / intermittent waterway downhill of the proposed AES Bed. Setback requirements under the
Queensland Plumbing and Wastewater Code for Advanced Secondary Effluent are obtainable.

Ground water was not encountered on this site during our investigation to a depth of 2000mm.

There is no evidence of fill in the proposed Land Application Area.

Rain water will transverse this site from adjoining properties during heavy rains.

Concentrated run-off from this property will transverse adjoining properties during heavy rains.

Soils were moist and there is no evidence of soil surface cracking in the LAA. No evidence of compaction or seepage
areas. Salinity is not evident.


3.0 Soil Investigation:

3.1 Drainage Pattern: Linear Planar
3.2 Method:
Soil Testing for the site was conducted by Global Testing on 8th July 2020 to a depth of 2000mm.

The soils were visual one textually classified in accordance with Table E1 AS/NZS 1547:2012. The soils were
predominately grey - brown in colour. Weakly structured Silty Sand - Clayey Sand - Sandy Clay.

Slight coherence; forms a fragile cast that just bears handling; gives a very short
5mm ribbon that breaks easily; discolours the fingers. Category 2 adopted.
The Site Classification was also conducted by Global Testing and indicate class “P” due to dense growth of trees.            See page 11.
Articulation Joints are to be designed by a suitable qualified person.
                                                                                     C Copyright Lance Picton 2020 design & content.   2/12